JPS58190817A - Photosensitive interlaminar compound - Google Patents

Abstract

PURPOSE:To obtain a photosensitive interlaminar compound enabling writing and erasing with light by allowing silver nitrate or a silver halide as an intercolorant to penetrate between mica layers. CONSTITUTION:Mica and AgNO3 or a silver halide such as AgCl, AgBr or AgI as an intercolorant are put in a quartz tube with one end sealed, and the tube is evacuated to about 10<-4> Torr and sealed. The silver compound is evaporated by heating in an electric furnace and allowed to penetrate into the mica. A photosensitive interlaminar compound enabling writing and erasing with light having wavelengths in a region ranging from the ultraviolet region to the near infrared region is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photosensitive compound that can be trapped and erased by light, and particularly relates to a photosensitive (-) compound. , graphite or 111 metal lucogenide compound is used as the matrix layered material, and an alkaline earth metal halide is used as an intercalant (N1 person trade) that penetrates into the 1st hole of this matrix layered material and forms a new 1-. etc.?It is known that the photosensitive material used in this package has been used.
I didn't know anything about it.

The inventors aimed to develop a photosensitive compound capable of writing and erasing with light in the ultraviolet to near-infrared wavelength range, and as a result of intensive research, they used mica as a matrix layered material, and on the other hand,
The present invention was based on the finding that a highly sensitive photosensitive compound can be obtained by synthesizing an inter-Il1 compound using a silver compound as an intercalant. Heretofore, almost no j-intercalant using mica as a parent layered substance has been known, and there is no example of its use as a silver compound *t-intercalant.

Silver nitrate (AgNOa) is used as the photosensitive compound J/J of the present invention.
or silver halide (AgC1, AgBr, AgI)
) It is formed by inserting mica, which is a kj-like substance, between In and the layer, and this compound has photo-induced physical properties that allow writing and erasing by optical input. Note that the writing and erasure referred to here means that the physical properties of the intercalation compound change due to light input, and the state can be maintained in that state by light input, and then the original physical properties are restored by light input again. refers to the properties that can cause

The present invention will be explained in detail below.

First, the Jili manufacturing method of the photosensitive intercalation compound of the present invention will be explained. Production of photosensitive intercalation compound (silver compound-mica intercalation compound)! This can be carried out, for example, based on a vapor molecule transport method. After weighing and weighing the mica and the same amount or more of the intercalant, the tube is placed in a quartz tube with one side closed, and a vacuum (10-' Torr) is applied to seal the tube. The reaction quartz tube containing the raw material is placed in a magnetic furnace with uniform heating or a temperature gradient, and is heated to near the melting point of the intercalant to encourage intercalant vapor to enter the mica. The heating temperature of the intercalant and mica greatly affects the shape and size of the mica, the time required to prepare the intercalant compound, and the amount of intercalant in the intercalant compound. For example, when using AgC1 (melting point 11°C) fr intercalant, at a heating temperature of 650°C, 540°
Compared to the case where Ag(J-mica intercalation compound) is produced, the cutting time can be shortened to less than one-tenth.The optimum temperature conditions are based on the wait of the raw material, the shape and size of mica, and It is necessary to set it appropriately depending on the desired amount of intercalant.

Examples of maximum JJi1 familiarity conditions obtained in experiments by the present inventors are shown below. The following data is 8 x 8 x
AgN0. is used as an intercalant using mica of about L mtn.

It was obtained using Ag(4', Agl).

When inserting fil AgN0a, the heating temperature is 85
Around 0'C (2) When inserting AgC1tl, the heating temperature is around 650°C (8) When inserting Agl, the heating temperature is around 610'C The silver compound-mica intercalation compound prepared by the above method is It was confirmed by X-ray diffraction experiments that the layered mica is elongated in the C-axis (layer surface vertical f!) direction compared to the interlayer distance of the matrix layered mica.The degree of elongation depends on the size and insertion of the intercalant molecules. This is determined by the following.Furthermore, used layered crystal mica is almost colorless and transparent, but the prepared intercalant compounds exhibit various colors depending on the type of intercalant.

Figure 1 (a) Is this the structure of the photosensitive intercalation compound produced as described above? show. This figure shows AgN0. This figure shows an example in which, due to the intercalation of C-axis superlattice, the first phase of the C-axis superlattice becomes eight times the interlayer distance of mica. In the figure, symbol 1 is a mica layer, 2 is AgN0. as an intercalant molecule. shows the layers of The results of the X-ray diffraction experiment,
It has become clear that the staging phenomenon described below also exists in silver compound-mica intercalation compounds. Staging refers to n between two adjacent intercalant layers.
This refers to a state in which two mica layers are interposed, and such an intercalation compound is called a stage n intercalation compound. FIG. 1 therefore represents a stage 1 intercalation compound. Note that the present invention is not limited to stage 1 intercalation compounds, but also includes photosensitive intercalation compounds of stage 2 or higher. In addition,
FIG. 1(b)k: A 1a structure of mica is shown for comparison.

The intercalation compound produced as described above has photo-induced physical properties that can be suppressed and erased (light input), which are properties that are not exhibited in the case of a single mica or a single intercalant. ! It has photo-induced physical properties that cause specific changes in optical properties in response to continuous light input. Among these properties, the properties that the present inventors focused on are as shown in the following experimental example).The light transmittance of the intercalation compound changes due to the input of light at a certain wavelength λ1, and then The photosensitive intercalation compound of the present invention exhibits photo-induced properties such as the property of returning to its original translucency upon input of light at wavelength λ2 and the change of reflectance due to light input, and therefore, the photosensitive intercalation compound of the present invention
It has been suggested that the above-mentioned writing and erasing is possible even when other optical properties (e.g. polarization, optical rotation, etc.) are difficult; Possibility is suggested.

The present invention will be explained in more detail below with reference to experimental examples.

[Experiment example 1] Figure 2 shows AgNU which is superior by the above-mentioned manufacturing method.

- Shows the photosensitive characteristic of mica I/n interlayer compound (photosensitive intercalation compound) that can be erased by light input. Curve a in the figure is the translucency before writing, and curve A is the translucency after writing. show. In the case of this intercalation compound, the transmittance in the outside normal region (0.4 to 8.0 μm) decreases due to light irradiation.
), the transmittance is lower than the subsequent 0.8 μm light/dark light irradiation (b−+a). The photosensitivity of a single animal is 210 mJ Il for 0.4 μm light, less than a male, for 0.8 μm light -
(1001nJ/Cl11" or less, AgN0.
This is much better than the case of a single unit (100 J/c- or more). The incident light is obtained from a mercury lamp or a halogen lamp light source via a sharp cut filter/interference filter. As shown in this example, the photosensitive intercalation compound of the present invention is capable of writing and erasing by optical input.

[Experimental Example 2] Figure 3 shows the '1e of the AgN0A-mica intercalation compound.
It shows 14 light irradiation effects. 0.75 with constant power
When the reflectance is measured under continuous 11+4 μm light irradiation, it becomes bistable between these two values (with the passage of time). move. The frequency of row shifting or the ratio of the two reflectances depends on the incident light power, or the correlation thereof is not clear. This optical migration phenomenon can be observed with respect to various light sources including semiconductor lasers and gas lasers.

[Experimental Example 3] FIG. 11 shows a reflectance curve of the AgN0'-mica intercalation compound that is nonlinear with respect to changes in the power of incident light and has hysteresis. In this figure, curve C is a change curve of reflectance with respect to incident light power added by ↓W,
Curve d shows the rate of change curve of reflectance for decreasing incident power. State where the reflectance is almost constant (symbol ■ in the figure,
The state indicated by 11) is an energetically stable state,
It is unclear that the region of the nonlinear curve in between is an energetically unstable state. When the power of the incident light is cycled very slowly, the bistable light transfer phenomenon shown in FIG. 3 can be observed conspicuously in the nonlinear intermediate region.

The highly sensitive reversible photosensitivity and light irradiation effect exhibited by the AgN0.-mica intercalation compound shown in Experimental Examples 1 to 3 above can be considered to be the effect of intercalation. Mica does not have the above-mentioned effects when used alone.

01 Reverse photosensitivity (injection wavelength, extinction wavelength, sensitivity, etc.) and light irradiation effect largely depend on the type of silver compound intercalant.

As explained above), the photosensitive intercalation compound of the present invention is
It has a variety of previously unknown physical properties, such as sensitivity to writing and erasing due to optical input (5), high reversible photosensitivity, and specific changes in reflectance due to light irradiation. This makes it possible to develop new technical fields, such as storage media such as optical disks and optical devices for information transmission, for example.

[Brief explanation of the drawing]

@/11! , 1(a)ri, Ag No as an example of the photosensitive intercalation compound according to the present invention, - A sectional view perpendicular to the 1 m plane of the mica intercalation compound, FIG. 7(b) is a sectional view perpendicular to the layer plane of mica ( 2) Figure 2 is a photosensitivity characteristic diagram showing that the transmittance of an intercalation compound changes reversibly by irradiation with incident light of different wavelengths, and Figure 3 shows that the same intercalation compound is bistable. Figure 1 shows an example of the optical cliff shift phenomenon, and is a reflectance curve of the same interlayer compound': flash, which shows nonlinear changes and hysteresis with respect to changes in the power of human incident light. Figure ■ tσ (b)

Claims (1)

[Claims] A photosensitive intercalation compound characterized in that silver nitrate or silver halide is intercalated with mica.