WO2015041442A1 - 표면 증강 라만 분광용 기판 및 이의 제조방법 - Google Patents
표면 증강 라만 분광용 기판 및 이의 제조방법 Download PDFInfo
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- WO2015041442A1 WO2015041442A1 PCT/KR2014/008613 KR2014008613W WO2015041442A1 WO 2015041442 A1 WO2015041442 A1 WO 2015041442A1 KR 2014008613 W KR2014008613 W KR 2014008613W WO 2015041442 A1 WO2015041442 A1 WO 2015041442A1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
- G01N21/658—Raman scattering enhancement Raman, e.g. surface plasmons
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54373—Apparatus specially adapted for solid-phase testing involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/068—Optics, miscellaneous
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/902—Specified use of nanostructure
- Y10S977/932—Specified use of nanostructure for electronic or optoelectronic application
- Y10S977/953—Detector using nanostructure
- Y10S977/954—Of radiant energy
Definitions
- the present invention can significantly increase the surface-enhanced Raman signal by manufacturing the metal nanoparticles spaced several nanometers apart on the substrate, and for surface-enhanced Raman spectroscopy that can significantly enhance the Raman signal even when stored for a long time. Board; And a method for producing the surface enhanced Raman spectroscopy substrate in large areas with simple equipment and low production cost.
- Raman scattering is an inelastic scattering in which the energy of incident light changes, and when light is applied to a specific molecular sieve, light that has a wavelength slightly different from that irradiated by the vibration transition inherent to the molecular sieve is generated.
- Raman spectroscopy allows signals to be obtained even for nonpolar molecules with a change in the induced polarization of the molecules, and virtually all organic molecules have their own Raman Shift (cm ⁇ 1 ).
- it since it is not affected by the interference of water molecules, it is more suitable for the detection of biomolecules such as proteins and genes.
- the wavelength of the Raman emission spectrum represents the chemical composition and structural characteristics of the light absorbing molecules in the sample
- analyzing the Raman signal can directly analyze the analyte.
- the signal strength is so weak that expensive equipment is required for detection and the signal is not practically used in fields other than academic research because of its low reproducibility. Did not reach.
- surface-enhanced Raman scattering was reported in 1974 by Fleishmann et al. They observed that the intensity of the Raman signal increased by 10 6 times when the pyridine molecules were adsorbed on the aqueous solution after repeated oxidation-reduction on the silver (Ag) electrode. That is, surface-enhanced Raman spectroscopy refers to a phenomenon in which the Raman signal of the molecule is greatly increased when the target molecule is present around the metal nanostructure.
- One of the advantages of surface-enhanced Raman scattering analysis is that it can provide information that is not available with conventional Raman analysis.
- One of the ways to confirm whether such surface enhanced Raman scattering analysis is possible is to study how the material to be analyzed interacts with the surface. In other words, because many surface interactions are involved between the material to be analyzed and the metal surface, the enhanced Raman signal can not be observed in the general Raman spectrum.
- Surface enhanced Raman scattering can occur when the material to be analyzed is adsorbed or close to the prepared metal surface.
- there must be a phenomenon in which free electrons of the metal surface vibrate collectively between the metal and the incident light which is called surface plasmon, which is the basis of the electromagnetic enhancement effect. Incident light generates surface plasmons (electromagnetic effects) on the metal surface, and surface plasmons greatly enhance Raman emission through interactions with analytes (charge transfer effects).
- the roughness of the surface of the measurement substrate on which the analyte is located is an important factor in achieving the significant improvement of the Raman signal caused by the generation of surface plasmons by the incident light and the interaction with the surface plasmons. Therefore, a method of introducing nanostructures such as nanometer-level pillars, repeated linear irregularities or nanoparticles using various nanomanipulation techniques may be used as a method for introducing roughness on the surface of the substrate.
- metal nanomaterials In general, physical and chemical properties, including optical and electrical properties of metal nanomaterials, can be controlled through changes in size, shape, and crystal structure.
- precious metal nanoparticles composed of gold, silver, and the like resonate strongly with light in the visible region, resulting in very strong absorption and scattering.
- the frequency of surface plasmon resonance depends on the type of metal nanoparticles (usually Au, Ag, Cu, Pt, Pd, etc.), the size and shape, the dispersed solvent, the type of laser (incident light), and the like. Thus, by controlling them, a more sensitive surface enhanced Raman signal can be obtained.
- the bottom-up method is capable of massively parallel processing and economically manufacturing large-area nanostructure patterning quickly.
- the top-down method provides excellent control over particle size and shape, but has a high cost and a large area limitation.
- the low detection intensity of surface-enhanced Raman spectroscopy and the ability to detect even a small amount of samples are very attractive in biosensor application research.
- the information on the chemical structure of the sample provides a narrow width spectrum, and because each molecule has its own Raman signal, multiple detection is possible at the same time.
- studies on biomaterials (DNA, proteins, cells, etc.) detection and disease diagnosis devices have been actively reported.
- by combining the microfluidic device and Raman spectroscopy technology it is possible to implement a continuously reproducible surface-enhanced Raman diagnostic device.
- the inventors of the present invention can not only manufacture a substrate for surface-enhanced Raman spectroscopy in a large area with simple equipment and low production cost, but also remarkably improve the Raman signal by reproducing the spacing between metal nanoparticles to several nanometers.
- a uniform protrusion structure having an upper protruding curved surface is formed on the surface of the polymer substrate by plasma dry etching, and then a metal is deposited using vacuum deposition.
- depositing the present invention it was confirmed that the above object can be achieved by preparing a substrate for surface-enhanced Raman spectroscopy in which nanoparticles are arranged at intervals of several nanometers on a metal thin film.
- One object of the present invention because it comprises a metal nanoparticle evenly spaced at a few nanometer intervals over a large area on the surface, it maintains an excellent Raman signal enhancement effect even if stored for a long time, showing a reproducible enhancement effect It is to provide a substrate for surface enhanced Raman spectroscopy capable of quantitative analysis.
- Another object of the present invention is to provide a method for producing a substrate for surface-enhanced Raman spectroscopy, which can be produced in large area with simple equipment and low production cost, and can reproducibly produce a gap between metal nanoparticles to several nanometers. will be.
- Still another object of the present invention is to provide a Raman spectroscopy device including a light source, the surface enhanced Raman spectroscopy substrate, and a detector for detecting Raman spectroscopy.
- Still another object of the present invention is to prepare a substrate for the surface enhanced Raman spectroscopy; Bringing analyte close or in contact with the substrate; Light irradiation; And detecting Raman spectroscopy scattered from the analyte, to provide a method of performing Raman spectroscopy on the analyte.
- the present invention (i) a polymer substrate formed with spaced protrusion structures having an upper protrusion curved surface on the first surface; (ii) metal-containing nanoparticles formed on the protrusion structure; And (iii) a metal containing thin film layer formed on part or all of the non-protruding portion on the first surface of the polymer substrate, wherein the metal containing nanoparticles are nanogap with adjacent nanoparticles, adjacent metal containing thin film layers or both.
- the present invention is a light source;
- a detector for detecting Raman spectroscopy In this case, as the light source, a laser capable of providing a high power incident light may be used as the light source, as used in a general Raman spectroscopy apparatus.
- the present invention provides a method for performing Raman spectroscopy on an analyte, comprising: preparing a substrate for surface enhanced Raman spectroscopy; Bringing analyte close or in contact with the substrate; Light irradiation; And detecting Raman spectroscopy scattered from the analyte.
- the term "surface-enhanced Raman spectroscopy (SERS)” is also referred to as surface-enhanced Raman scattering, Raman activity such as a metal roughly treated material to be analyzed When adsorbed on a material surface or located within a few hundred nanometers, the Raman scattering of analytes of intensity increased by 10 4 to 10 6 times more than the normal Raman intensity by surface plasmons provided by the surface roughness. It means the spectroscopy to measure.
- Raman scattering is an inelastic scattering in which the energy of incident light changes, and when light is applied to a specific molecular sieve, a light having a wavelength slightly different from that irradiated by the vibration transition inherent to the molecular sieve is generated.
- Raman spectroscopy Unlike infrared spectroscopy, which measures vibrational energy that changes the dipole moment, another widely used method for analyzing vibration transitions, Raman spectroscopy allows signals to be reproduced even for nonpolar molecules with a change in the induced polarization of the molecule.
- almost all organic molecules have inherent Raman Shift (cm -1 ) and are not affected by the interference of water molecules, and thus, the detection of biomolecules such as proteins, genes, etc. More suitable.
- the wavelength of the Raman emission spectrum represents the chemical composition and structural characteristics of the light absorbing molecules in the sample
- analyzing the Raman signal can directly analyze the analyte.
- Raman spectroscopy has not been commercialized in that the signal strength is so weak that it is difficult to detect and thus requires high performance equipment for detection.
- Raman signal enhancement two basic mechanisms for Raman signal enhancement are to induce electromagnetic and chemical enhancement.
- electromagnetic effects play a leading role. This electromagnetic buildup depends on the presence of roughness properties of the metal surface.
- surface-enhanced Raman signals are primarily adsorbed on coin metals such as gold, silver and copper, or on alkali metal surfaces such as lithium, sodium and potassium, which have excitation wavelengths in the visible or near visible range. It appears in the analyte.
- the intensity of the Raman signal is proportional to the square of the electromagnetic field applied to the analyte and is expressed as the sum of the electromagnetic field applied to the analyte in the absence of roughness and the electromagnetic field resulting from the grain metal roughness. Accordingly, efforts have been made in various fields to manufacture a substrate capable of controlling a surface structure, that is, providing a surface enhanced Raman signal increased at a significantly high rate. Several studies have reported that significant increases in Raman signals can be realized on structures that contain gaps on the order of several nanometers (Nat. Nanotechnology, 2010, 5 (10): 732-736; Chin. Phys. Lett., 2007, 24 (10): 2934-2937).
- the inventors of the present invention have attempted to manufacture a substrate for surface-enhanced Raman spectroscopy including nanogaps uniformly distributed over a large area, and depositing a metal, which is a Raman active material, by vacuum deposition on a polymer substrate including protrusion structures.
- Metal nanoparticles are specifically formed on the structure, and a metal-containing thin film layer is formed on a part or the whole of the substrate except the protrusion structure on the substrate, and the metal is deposited according to the spacing of the protrusion structures on the substrate.
- a substrate for surface-enhanced Raman spectroscopy was prepared in which the metal nanoparticles formed were uniformly arranged at intervals of several nanometers.
- the term "surface plasmon resonance (SPR)” refers to the collective oscillation of electrons in a solid or liquid stimulated by incident light, so that the frequency of photons is resiliency of the positive nucleus. Resonance conditions are established when they coincide with the natural frequency of the surface electrons oscillating with respect to.
- SPR surface plasmon resonance
- This surface plasmon resonance can be used to analyze materials adsorbed on metal (especially gold or silver) surfaces.
- the surface-enhanced Raman spectroscopy substrate according to the present invention is structurally formed on the protruding structure of the polymer substrate, for example, in the form of a circular or elliptical metal nanoparticles bonded thereto, and in the portion where the protruding structure in the same substrate does not exist.
- the thin film layer is formed. Accordingly, the substrate for surface enhanced Raman spectroscopy according to the present invention is not only surface plasmon resonance between nanoparticles spaced at several nanometer intervals introduced on the protruding structure, but also several to several tens of nanometers away from the underlying nanoparticles.
- the Raman signal can be detected more sensitively.
- the above-described structural features of the substrate for surface-enhanced Raman spectroscopy when the metal is deposited by a sputtering method on a polymer substrate including a projection structure, the projection structure and the front surface of the substrate is exposed at the beginning of deposition; Evenly deposited in the spaces between the structures, but as the deposition proceeds due to the shadow effect of the sputtered particles on the protruding structure (protruding structure of the substrate surface where the protruding structure does not exist) The amount of metal reaching and blocked by the structure and the nanoparticles growing spherically on the structure is significantly reduced and is due to the phenomenon that the particles grow by being concentrated on the upper portion of the protruding structure.
- the spaced apart protrusions are preferably arranged at regular intervals. More preferably, the spaced apart protrusions may be aligned at intervals of 10 to 500 nm. Preferably, the spaced apart protrusions may be aligned at intervals of 20 to 200 nm, and more preferably, may be aligned at intervals of 40 to 80 nm.
- the spacing of the protruding structures becomes too close to less than 10 nm, the metal nanoparticles formed and grown on the protruding structures by vacuum deposition cannot be formed in the form of independent particles of particles arranged at intervals of several nanometers. It can be made into a thin film.
- the metal when the metal is formed at a distance apart from each other at a distance of more than 500 nm, the area where the shadow effect by the nanoparticles formed on the protruding structure is not applied when the metal is deposited is wide, resulting in a thick metal layer formed in the portion where the protruding structure does not exist.
- the boundary between the nanoparticles formed on the protruding structure may be blurred, and in order to maintain the nanometer-level gap between the particles, the nanoparticles become larger in size to offset the gap and are included in the unit area. The density of the gap is also reduced, resulting in a decrease in the number of spots that can enhance the Raman signal.
- the protruding structure preferably has a protruding curved surface.
- methods such as etching are advantageous over methods such as imprinting to provide flat and angled structures.
- the protrusion structure may be generated by dry etching the surface of the polymer substrate.
- the dry etching may be a plasma dry etching performed using any one or more gases selected from the group consisting of argon, oxygen, hydrogen, helium, and nitrogen gas, but the protrusion structure having a protruding curved surface on the polymer substrate.
- the plasma dry etching process of the polymer substrate may be performed according to various methods known in the art.
- protrusions are formed when the polymer substrate is plasma dry etched, and the spacing and size of the protrusions are varied by changing various variables of the process, for example, the flow rate and power of the gas forming the plasma, and the exposure time to the plasma. I can regulate it.
- the metal-containing nanoparticles and the metal-containing thin film layer may be formed by vacuum deposition on a first surface of a polymer substrate on which protrusion structures having spaced upper protrusions are formed.
- the vacuum deposition is preferably performed by sputtering, evaporation, and chemical vapor deposition, but is not limited thereto.
- the metal-containing nanoparticles on the protruding structure may be formed in a spherical or elliptical shape, but is not limited thereto.
- the average particle diameter of the metal-containing nanoparticles may be from 5 nm to 1 ⁇ m.
- the average particle diameter of the metal-containing nanoparticles may be 10 nm to 300 nm, but is not limited thereto.
- the horizontal maximum width W1 of the metal-containing nanoparticles perpendicular to the polymer substrate is equal to or larger than the horizontal maximum width W2 of the protrusion structure perpendicular to the corresponding polymer substrate. It is preferred to be smaller than the shortest gap W3 between the centers of the structures.
- the horizontal maximum width of the metal-containing nanoparticles is smaller than the horizontal maximum width of the corresponding protrusion-type structure, when formed in a size smaller than the polymer protrusion-type structure that does not exhibit the Raman activity enhancement effect, between nanoparticles Increasing the interval may not result in more effective Raman signal enhancement effects.
- the horizontal maximum width of the metal-containing nanoparticles is larger than the shortest distance between the centers of the corresponding projection structures, they do not form nanogaps that can provide a significant Raman signal enhancement effect and are connected to each other, resulting in continuous It provides an embossed surface with curved asperities.
- the metal-containing nanoparticles may be nanoparticles containing a metal, metal oxide or metal nitride which is a Raman active material.
- the metal in the metal-containing nanoparticles may be Au, Ag, Cu, Pt and Pd, and alloys thereof to provide an electromagnetic field increased by surface plasmon resonance to enhance the Raman signal of the analyte adsorbed thereto. It is preferred that it is chosen.
- the polymer substrate may be formed of acrylic polymers, polyethersulfone; PES), polycycloolefin (PCO), polyurethane (polyiourethane) and polycarbonate (PC) is a polymer itself substrate formed of a polymer selected from the group consisting of, or a reinforcing coating layer containing the polymer on another substrate Coated in the form of can be used. More preferably, the acrylic polymer itself may be a substrate coated with a reinforcing coating layer including the acrylic polymer.
- Non-limiting examples of the acrylic polymer is polymethyl methacrylate (Poly (methyl methacrylate); PMMA), polymethacrylate (polymethacrylate), polymethyl acrylate (poly (methyl acrylate); PMA), polyethyl acrylate (poly (ethyl acrylate); PEA), poly (2-chloroethyl vinyl ether) (PCVE), poly (2-ethylhexyl acrylate) (poly (2-Ethylhexyl acrylate); PEHA), polyhydroxyethyl methacrylate (poly (Hydroxyethyl methacrylate); PHEMA), poly (butyl acrylate) (PBA), polybutyl methacrylate (poly (butyl methacrylate); PBMA), polyethylene Terephthalate (polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or polytrimethylolpropane triacrylate (poly (trimethylolprop
- the reinforcement coating layer may include a polymer paint such as acrylic, polyurethane, epoxy or primer paint.
- the reinforcing coating layer may further include inorganic fine particles selected from the group consisting of metal oxides, metal sulfides, alumina, silica, zirconium oxide and iron oxide, may be coated on another substrate with a thickness of 1 to 10 ⁇ m. have.
- the present invention provides a method for producing a surface enhanced Raman spectroscopy substrate, the first step of forming a protrusion-like structure having an upper protruding surface spaced apart from each other by dry etching the first surface of the polymer substrate ;
- the metal-containing Raman active material was vacuum deposited until a nanogap was formed between adjacent metal-containing nanoparticles, so that the metal-containing nanoparticles were formed on each of the upper protruding surfaces of the protruding structures on the first surface of the polymer substrate.
- a method of manufacturing a substrate for surface enhanced Raman spectroscopy including a third step of forming a metal-containing thin film layer on a portion without a protruding structure.
- the vacuum deposition may be performed by sputtering, evaporation, and chemical vapor deposition.
- the method for manufacturing a substrate for surface enhanced Raman spectroscopy according to the present invention is characterized in that it is a method capable of producing a large-scale substrate having a uniform Raman signal enhancement effect over the entire area with simple equipment and low production cost. Therefore, the substrate prepared by the same method shows a reproducible reinforcing effect, it is possible to quantitatively analyze the sample.
- the large area may preferably be from 1 mm 2 to 10 m 2 . More preferably, it may be 1 mm 2 to 1000 cm 2 , but is not limited thereto.
- the area of the substrate which can be produced by the manufacturing method according to the present invention depends on the etching method capable of providing uniformly spaced protrusion structures and the method of uniformly sputtering the metal-containing Raman active material. Therefore, the area of the substrate that can be provided may increase as the etching method and the sputtering method develop.
- the substrate manufactured according to the present invention is excellent in durability and can exhibit a uniform Raman signal augmentation effect even when left in the air for several decades.
- the substrate prepared by the method of the present invention includes particles containing metal spaced at intervals of several nanometers, so that the air is oxidized as air enters and exits into a narrow space of several nanometers substantially between particles even when exposed to the atmosphere. It is not easy to cause a reaction. Accordingly, when the surface is treated using a metal as a conventional Raman active material, as the exposure time to the air increases, the metal is oxidized and the Raman signal enhancement effect is remarkably reduced, but the substrate manufactured according to the present invention Can be stored for several months and still show high levels of Raman enhancement.
- the present invention is a light source; The substrate for surface enhancement Raman spectroscopy; And a detector for detecting Raman spectroscopy.
- the weakness of Raman spectroscopy is that the signal strength is weak. Therefore, in order to overcome this, it is possible to construct a Raman spectroscopic device having a substrate for surface enhanced Raman spectroscopy according to the present invention.
- the light source is preferably a laser capable of providing high-density photons.
- the detector is preferably provided with a photomultiplier tube (PMT), an avalanche photodiode (APD), a charge coupled device (CCD), and the like, which can effectively amplify a detection signal.
- PMT photomultiplier tube
- APD avalanche photodiode
- CCD charge coupled device
- the present invention provides a method for performing Raman spectroscopy on an analyte, comprising: preparing a substrate for surface enhanced Raman spectroscopy; Bringing analyte close or in contact with the substrate; Light irradiation; And detecting Raman spectroscopy scattered from the analyte.
- Raman spectroscopy substrates including metal nanoparticles spaced several nanometers apart on the substrate according to the present invention can be manufactured in large area with simple equipment and low production cost.
- the spacing between the metal nanoparticles can be produced reproducibly with a few nanometers can exhibit a significantly improved Raman signal augmentation effect, it is possible to maintain the Raman signal augmentation effect to a high level even when stored for a long time .
- FIG. 1 is a view schematically showing the structure and manufacturing method of the substrate for surface enhanced Raman spectroscopy according to the present invention.
- FIG. 2 is a view schematically illustrating a difference between structures formed by metal deposition according to the presence and spacing of protrusion structures on a polymer substrate.
- Figure 3 is a view showing the height and spacing of the protruding structure on the substrate according to the plasma treatment time according to the present invention.
- FIG. 4 is a view showing an atomic probe microscope image of the surface of the surface enhanced Raman spectroscopy substrate and the depth profile of the cut surface (red line) according to an embodiment of the present invention.
- FIG. 5 is a view showing the change in the absorption spectrum according to the size of the metal nanoparticles formed on the protruding structure on the polymer substrate by a vacuum deposition method.
- FIG. 6 is a distribution diagram of EF values calculated at each pixel based on the Raman mapping result using the surface enhanced Raman spectroscopy substrate according to the present invention.
- FIG. 7 is a view showing a uniform Raman signal enhancement effect in the large area of the surface enhanced Raman spectroscopy substrate according to the present invention.
- FIG. 8 is a view showing the results of the stability test for exposure to the atmosphere of the surface enhanced spectroscopic substrate according to the present invention. At each time point, more than 350 Raman mappings were performed to derive statistical EF values and expressed as a function of storage period. The substrate was stored exposed to the atmosphere at a temperature of 22 ° C. and a humidity of 40%.
- the etching system consisted of a 6 inch diameter showerhead portion consisting of a 0.23 inch diameter stainless steel tube and a 6 inch diameter electrode positioned 15 cm apart therefrom. Specifically, after attaching a 125 ⁇ m thick polymer substrate purchased from Panac to the electrode, when the pressure of the reaction chamber reaches a vacuum of 6.7 Pa level, 99.999% argon gas is flowed through the shower head at a flow rate of 50 sccm. Injection into the reactor raised the pressure of the reaction chamber to 22.7 Pa.
- PTT polyethylene terephthalate
- CCP capacitively coupled plasma
- Plasma dry etching was performed with varying etching time at RF power of 200 W (ie 1.1 W / cm 2 ). Plasma ion energy applied to the polymer substrate during the etching process from self-bias on the electrode was inferred to 102 eV. On the other hand, the temperature of the polymer substrate during the etching process was maintained at 50 or less close to room temperature. The spacing of the nanometer-scale protrusion structures formed on the polymer substrate through the process increased linearly as the etching process time was increased, and the protrusion structures were formed when the etching process was performed for 1 minute or less under the above conditions. The interval between the livers was maintained at levels below 40 to 80 nm ( Figure 3). The spacing and size of the polymer protrusions were measured using the cross-sectional profile method of AFM.
- Silver particles were deposited as a Raman active material by sputtering vacuum deposition on the surface including the protruding structure of the polymer substrate prepared according to the first step.
- the deposition was performed at room temperature using a magnetron multi-gun sputtering system (A-Tech System Co., Ltd., Flexlab system 100).
- a polymer substrate having protrusion structures formed on one surface of the sputtering system is mounted on the substrate holder 15 cm above the target. After mounting the substrate and reducing the pressure in the deposition chamber to 4.5 ⁇ 10 ⁇ 6 Torr, 99.999% argon gas was introduced at 45 sccm hydraulic pressure to increase the process pressure level to 3 mTorr.
- Silver metal particles were deposited by DC reactive sputtering using a DC target of 0.13 W / cm 2 using a silver target (Williams Advanced Materials Inc.) having a diameter of 4 inches. That is, silver nanoparticles having a size of 60 nm were formed on the polymer protrusion structure formed through the Ar plasma pretreatment process for 60 seconds under RF 200W, and a thin film layer was formed on a portion without the protrusion structure on the substrate.
- protruding structures were formed on various kinds of polymers such as PC, PEN, and PET substrates, and silver nanoparticles were deposited to prepare substrates for surface enhanced Raman spectroscopy.
- the atomic probe microscope was used to measure the distance between the silver nanoparticles formed by scanning the surface of the polymer into which the silver nanoparticles were introduced, and the depth from the top of the nanoparticles to the surface of the substrate on which the silver thin film layer containing no protrusion structure was formed.
- the depth profile of one end surface of the polymer surface is shown in FIG.
- Obtaining the maximum Raman signal augmentation by adjusting the spacing between nanoparticles as described above is not only controlling the size and spacing of the protruding structure by adjusting process conditions and time in the plasma dry etching process of the first step, but also the second step. It can be achieved by controlling the size of the nanoparticles formed and grown on the protruding structure by adjusting the sputtering conditions and time during metal deposition by the sputtering of.
- the optical properties of the substrate for surface enhanced Raman spectroscopy including metal nanoparticles formed on the PET polymer substrates prepared by the first and second steps according to Example 1 were analyzed.
- the arrangement interval of the metal nanoparticles on the final surface enhanced Raman spectroscopy substrate can be adjusted to within several nanometers.
- the metal nanoparticles thus formed exhibits a characteristic spectrum showing a high absorption in a specific wavelength region with respect to incident light, in particular the position of the maximum absorption wavelength on the absorption spectrum according to the size of the nanoparticles formed The change was confirmed.
- benzenethiol was used as a test reagent. Used. Specifically, 100 ⁇ l of 2 ⁇ M benzenethiol solution was dropped onto a 2.5 cm ⁇ 1.3 cm sized surface enhanced Raman spectroscopy substrate and dried for 1 hour. After rinsing the surface-enhanced Raman spectroscopy substrate on which the benzenethiol was adsorbed several times with ethanol, nitrogen gas was blown and dried.
- the Raman signal was measured and mapped in the 10 ⁇ m ⁇ 10 ⁇ m region of the surface-enhanced Raman spectroscopy substrate coated with the analyte thus prepared.
- a laser of 532 nm wavelength was irradiated at 0.2 mW.
- Raman mapping an area of 10 ⁇ m ⁇ 10 ⁇ m was divided into 32 pixels by 32 pixels so that one point where the spectrum was obtained corresponds to the diffraction limit, and a spectrum was obtained with an exposure time of 2 seconds.
- Raman mapping obtained the Raman spectrum and calculated the area of the signal appearing in the characteristic peak of benzenethiol in the 998 cm -1 region and converted it into an enhancement factor (EF). In the region of 10 ⁇ m ⁇ 10 ⁇ m, total EF values were mapped at. The EF values calculated at each pixel are shown in FIG. 6.
- the total EF value measured by measuring the Raman signal in a total of 32x32 that is, 1024 pixels in a 10 ⁇ m x 10 ⁇ m region was distributed in a 1.1 to 1.4x10 7 region, in particular, a maximum distribution was about 1.25x10 7 .
- the normal distribution having a narrow full-width half maximum (FWHM) of about 0.1 ⁇ 10 7 represents a normal distribution (Gaussian) and a relatively even EF value even in a large area. This indicates that when using the surface enhanced Raman spectroscopy substrate according to the present invention, since it shows a uniform signal enhancement effect in a large area, it can be used for quantitative analysis as well as qualitative analysis.
- the Raman mapping was repeated at least 350 times and the statistical EF values were shown.
- the distribution of the average and 1.1 to 1.7x10 7 domain derived from a single similar mapping and confirmed that indicates the maximum distribution in the vicinity of 1.3x10 7.
- the FWHM was derived to show the distribution in each mapping, and the distribution thereof was shown.
- the FWHM of each mapping represented 0 to 25% of the mean value, and the maximum distribution was 10 to 15%. It was confirmed that the level is similar to the value.
- the reproducibility experiment is not simply performed by increasing the number of repetitions, but shows the results measured using a sample manufactured in a total of five batches, it is possible to achieve a reproducible signal augmentation effect from the substrate produced through the same manufacturing process Confirmed.
- the surface-enhanced Raman spectroscopy substrate according to the present invention can not only enhance the signal uniformly over a large area but also exhibit reproducible reproducible effects even after hundreds of repetitions, which is useful for qualitative as well as quantitative analysis. Indicates that it can.
- a metal which is a Raman active material by vacuum deposition on a polymer substrate comprising a uniformly arranged projection structure according to the present invention is arranged to have a nanogap by controlling the size and spacing on the projection structure
- Surface-enhanced Raman spectroscopy substrates containing nanoparticles do not require expensive equipment, materials, or complex processes, and therefore can be manufactured at low cost through a simple process, and can provide a uniform surface even in large areas. , Mass production is easy.
- the distance between the nanoparticles can be adjusted to a few nanometers level it can exhibit a significantly enhanced Raman signal enhancement effect.
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Abstract
Description
Claims (24)
- (i) 제1표면 상에 상부 돌출곡면을 갖는 서로 이격된 돌기형 구조체들이 형성된 고분자 기판;(ii) 상기 돌기형 구조체 상에 형성된 금속 함유 나노입자; 및(iii) 고분자 기판의 제1표면 상의 돌기형 구조체가 없는 부분의 일부 또는 전부에 형성된 금속 함유 박막층을 포함하되,상기 금속 함유 나노입자와 상기 금속 함유 박막층은 상기 제1표면 상에 금속 함유 라만활성물질을 동시에 진공증착시켜 형성되며,상기 금속 함유 라만활성물질은 초기에는 상기 제1표면 및 상기 돌기형 구조체에 균일하게 증착되나 증착이 진행됨에 따라 상기 돌기형 구조체의 상부에 집중적으로 증착되는 것인 표면 증강 라만 분광용 기판.
- 제1항에 있어서,상기 이격 형성된 돌기형 구조체들은 일정간격으로 정렬된 것인 표면 증강 라만 분광용 기판.
- 제2항에 있어서,상기 이격 형성된 돌기형 구조체는 10 내지 500 nm 간격으로 정렬된 것인 표면 증강 라만 분광용 기판.
- 제1항에 있어서,상기 돌기형 구조체는 고분자 기판의 표면을 건식 에칭하여 생성되는 것인 표면 증강 라만 분광용 기판.
- 제4항에 있어서,상기 건식 에칭은 아르곤, 산소, 수소, 헬륨 및 질소 기체로 구성되는 군으로부터 선택되는 어느 하나 이상의 기체를 사용하여 수행되는 플라즈마 건식 에칭인 것인, 표면 증강 라만 분광용 기판.
- 제1항에 있어서, 상기 진공증착은 스퍼터링(sputtering), 기화(evaporation) 및 화학 증기 증착(chemical vapor deposition)에 의해 수행되는 것인 표면 증강 라만 분광용 기판.
- 제1항에 있어서,상기 돌기형 구조체 상의 금속 함유 나노입자는 구형 또는 타원형의 형태로 형성되어 있는 것인 표면 증강 라만 분광용 기판.
- 제1항에 있어서,상기 금속 함유 나노입자의 평균입경은 5 nm 내지 1 μm인 것인 표면 증강 라만 분광용 기판.
- 제7항에 있어서,상기 금속 함유 나노입자의 평균입경은 10 nm 내지 300 nm인 것인 표면 증강 라만 분광용 기판.
- 제1항에 있어서,고분자 기판과 수직으로 존재하는 상기 금속 함유 나노입자의 수평방향 최대 폭(W1)은 이에 대응되는 고분자 기판과 수직인 상기 돌기형 구조체의 수평방향 최대 폭(W2)보다 같거나 크고 돌기형 구조체의 중심 간의 최단 간격(W3)보다 작은 것인 표면 증강 라만 분광용 기판.
- 제1항에 있어서,상기 돌기형 구조체들 간의 간격 및 돌기형 구조체 상에 형성된 금속 함유 나노입자의 크기를 조절하여 상기 금속 함유 나노입자들의 이격 간격이 조절된 것인, 표면 증강 라만 분광용 기판.
- 제1항에 있어서, 상기 금속 함유 나노입자들은 인접한 금속 함유 나노입자, 인접한 금속 함유 박막층 또는 둘 모두와 나노갭을 형성하며, 상기 나노갭은 1 내지 10 nm 범위로 형성되는 것인 표면 증강 라만 분광용 기판.
- 제1항에 있어서,상기 금속 함유 나노입자는 금속, 금속 산화물 또는 금속 질화물인 것인 표면 증강 라만 분광용 기판.
- 제1항에 있어서,상기 금속 함유 나노입자 중의 금속은 Au, Ag, Cu, Pt 및 Pd, 및 이의 합금으로 구성된 군에서 선택된 것인 표면 증강 라만 분광용 기판.
- 제1항에 있어서,상기 고분자 기판은 아크릴계 고분자(Acrylic polymers), 폴리에테르설폰 (Polyethersulfone; PES), 폴리시클로올레핀 (Polycycloolefin; PCO), 폴리우레탄 (polyiourethane) 및 폴리카보네이트(polycarbonate; PC)로 구성된 군으로부터 선택되는 고분자로 형성된 고분자 자체 기판이거나, 다른 기판 상에 상기 고분자를 포함하는 강화코팅층의 형태로 코팅된 것인 표면 증강 라만 분광용 기판.
- 제15항에 있어서,상기 아크릴계 고분자는 폴리메틸메타크릴레이트(Poly(methyl methacrylate); PMMA), 폴리메타크릴레이트(polymethacrylate), 폴리메틸아크릴레이트(poly(methyl acrylate); PMA), 폴리에틸아크릴레이트(poly(ethyl acrylate); PEA), 폴리(2-클로로에틸비닐에테르)(poly(2-chloroethyl vinyl ether); PCVE), 폴리(2-에틸헥실아크릴레이트)(poly(2-Ethylhexyl acrylate); PEHA), 폴리히드록시에틸메타크릴레이트(poly(Hydroxyethyl methacrylate); PHEMA), 폴리부틸아크릴레이트(poly(butyl acrylate); PBA), 폴리부틸메타크릴레이트(poly(butyl methacrylate); PBMA), 폴리에틸렌테레프탈레이트(polyethylene terephthalate; PET), 폴리에틸렌나프탈레이트(polyethylene naphthalate; PEN) 및 폴리트리메틸롤프로판트리아크릴레이트(poly(trimethylolpropane triacrylate); PTMPTA)로 구성된 군으로부터 선택되는 것인 표면 증강 라만 분광용 기판.
- 제15항에 있어서,상기 강화코팅층은 아크릴계, 폴리우레탄계, 에폭시계 및 프라이머계 도료로 구성된 군으로부터 선택되는 폴리머 도료를 포함하는 것인 표면 증강 라만 분광용 기판.
- 제15항에 있어서,상기 강화코팅층은 금속산화물, 금속황화물, 알루미나, 실리카, 산화지르코늄 및 산화철로 구성된 군으로부터 선택되는 무기미립자를 추가로 포함하는 것인 표면 증강 라만 분광용 기판.
- 제15항에 있어서,상기 강화코팅층은 1 내지 10 μm 두께로 코팅된 것인 표면 증강 라만 분광용 기판.
- 제1항에 기재된 표면 증강 라만 분광용 기판의 제조방법으로서, 고분자 기판의 제1표면을 건식 에칭 처리하여, 상부 돌출곡면을 갖는 돌기형 구조체들을 서로 이격되도록 형성시키는 제1단계;인접한 금속 함유 나노입자들 사이에 나노갭이 형성될 때까지, 금속 함유 라만활성물질을 동시에 진공증착시켜, 상기 돌기형 구조체들의 각 상부 돌출곡면 상에 금속 함유 나노입자들을, 고분자 기판의 제1표면 상의 돌기형 구조체가 없는 부분에는 금속 함유 박막층을 형성하는 제2단계를 포함하되,상기 금속 함유 라만활성물질은 초기에는 상기 제1표면 및 상기 돌기형 구조체에 균일하게 증착되나 증착이 진행됨에 따라 상기 돌기형 구조체의 상부에 집중적으로 증착되는 것인,표면 증강 라만 분광용 기판의 제조방법.
- 제20항에 있어서,상기 진공증착은 스퍼터링(sputtering), 기화(evaporation) 및 화학 증기 증착(chemical vapor deposition)에 의해 수행되는 것인 제조방법.
- 광원; 제1항 내지 제19항 중 어느 한 항에 기재된 표면 증강 라만 분광용 기판; 및 라만분광을 검출하는 검출기;를 구비한 라만분광 장치.
- 제22항에 있어서,광원은 레이저인 것이 특징인 라만분광 장치.
- 분석물에 대해 라만분광법을 수행하는 방법에 있어서,제1항 내지 제19항 중 어느 한 항에 기재된 표면 증강 라만 분광용 기판을 준비하는 단계;상기 기판에 분석물을 근접 또는 접촉시키는 단계;광조사하는 단계; 및분석물로부터 산란된 라만 분광을 검출하는 단계를 포함하는 것인 방법.
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| JP6198957B2 (ja) | 2017-09-20 |
| US9557272B2 (en) | 2017-01-31 |
| EP3048438A1 (en) | 2016-07-27 |
| EP3048438B1 (en) | 2021-07-07 |
| CN105556290A (zh) | 2016-05-04 |
| JP2016538563A (ja) | 2016-12-08 |
| EP3048438A4 (en) | 2017-06-07 |
| CN105556290B (zh) | 2019-05-07 |
| KR101448111B1 (ko) | 2014-10-13 |
| US20160223467A1 (en) | 2016-08-04 |
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