JPH06316440A - Solution composition for forming thin transparent zinc oxide film - Google Patents

Abstract

PURPOSE:To provide a soln. compsn. for forming a thin transparent zinc oxide film on a substrate of glass, ceramics, etc. CONSTITUTION:At least one kind of zinc compd. selected among zinc salts of 3-7C fatty acids such as n-zinc valerate and n-zinc caproate and zinc chelate compds. of 5-8C diketones such as acetylacetonatozinc is dissolved in an org. solvent to obtain the objective soln. compsn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solution composition for forming a light-transmitting zinc oxide thin film on a substrate made of glass, ceramics or the like.

[0002]

2. Description of the Related Art Since a translucent zinc oxide thin film has an extremely sensitive ultraviolet ray blocking function, with the recent development of the technology in the fields of ecology and biology, lighting from a biological point of view, Attention has been paid to the surface treatment of glass for greenhouses and microorganisms. Conventionally, as a method of forming a zinc oxide thin film, a spray method of spraying an aqueous solution of zinc acetate on a preheated substrate (J. Material Science, 22 (1987)
1379-1384), a sputtering method in which a film is directly formed on a substrate in a vacuum (Jpn. J. Appl. Phys., 24, L781 (1985)), and an organic solvent containing a zinc compound is applied, followed by baking. Appendix (J.
Mate-rials Science Letters, 9 (1990) 127-129) and the like are known.

Of these methods, the first method sprays an aqueous solution of zinc acetate at a high temperature onto a substrate heated to a high temperature, and therefore, in order to obtain a uniform thin film, the shape of the substrate is restricted. . The second method requires a treatment under vacuum, so that the size of the applicable substrate is limited, the apparatus is expensive, and the mass productivity is poor. It can be said that the third method is inexpensive and has high mass productivity. However, the butanol solution of zinc 2-ethylhexanoate used in this method is one of the well-known metal soaps that are commercially available.
When the solvent is volatilized with a dryer or the like, the compound contracts due to the surface tension of the compound itself, regardless of the concentration of the solution, so it is extremely difficult to obtain a uniform thin film.

[0004]

The present invention has been made to solve the above-mentioned problems in the conventional method for obtaining a translucent zinc oxide thin film, and is the third method. It is an object of the present invention to provide a solution composition which can be easily and inexpensively formed on a substrate by forming a uniform thin film of translucent zinc oxide by improving the cloth method.

[0005]

A solution composition for forming a translucent zinc oxide thin film according to the present invention has 3 to 7 carbon atoms.
And at least one zinc compound selected from the group consisting of a zinc salt of a fatty acid or a zinc chelate compound of a diketone having 5 to 8 carbon atoms is dissolved in an organic solvent.

In the solution composition of the present invention, a zinc salt of a fatty acid having 3 to 7 carbon atoms or a zinc chelate compound of a diketone having 5 to 8 carbon atoms is used as the zinc compound. Examples of the zinc salt of a fatty acid having 3 to 7 carbon atoms include, for example,
Preferred examples include n-zinc valerate and n-caproate, and examples of the zinc chelate compound of a diketone having 5 to 8 carbon atoms include zinc acetylacetonate. . These zinc compounds can be used alone or as a mixture.

The solution composition according to the present invention preferably contains the above zinc compound in a concentration of 1% by weight or more, and particularly preferably contains 5% by weight or more of the zinc compound. As an organic solvent for obtaining such a solution composition, it is possible to dissolve the above zinc compound at a concentration of preferably 1% by weight or more, and the adhesiveness to a substrate made of glass, ceramics or the like. It suffices that it be present, and for example, alcohols, esters, ketones and the like having relatively high boiling points such as n-butanol, dimethylformamide, acetylacetone, ethyl cellosolve and the like are preferably used.

According to the present invention, a uniform translucent zinc oxide thin film can be obtained by applying such a solution composition on a substrate and baking it. The firing temperature is usually 300 to 6
The range of 00 ° C. is preferable, but the range is not particularly limited thereto.

[0009]

The present invention will be described below with reference to examples.
The present invention is not limited to these examples. Example 1 A solution consisting of 10% by weight of n-zinc valerate and 90% by weight of acetylacetone was prepared and applied on a glass substrate, and then dried at room temperature for 30 minutes and further at 110 ° C. for 30 minutes,
Then, it was baked at 550 ° C. for 30 minutes to obtain a transparent zinc oxide thin film. As shown in FIG. 1, the transmittance of this thin film has an excellent ultraviolet blocking effect. Example 2 A solution consisting of 5% by weight of n-zinc caproate and 95% by weight of n-butanol was prepared, applied on a glass substrate, and then dried at room temperature for 30 minutes and further at 110 ° C. for 30 minutes,
Then, it was baked at 550 ° C. for 30 minutes to obtain a transparent zinc oxide thin film having an excellent ultraviolet blocking effect as in Example 1. Example 3 A solution consisting of 5% by weight of zinc acetylacetonate, 47.5% by weight of acetylacetone and 47.5% by weight of ethyl acetate was prepared, and applied on a glass substrate, then at room temperature for 30 minutes.
Min, then dry at 110 ° C for 30 minutes, then 550 ° C
After baking for 30 minutes in the same manner as in Example 1, a transparent zinc oxide thin film having an excellent ultraviolet blocking effect was obtained.

[0010]

As described above, the composition according to the present invention is
As the zinc compound, a zinc salt of a fatty acid having 3 to 7 carbon atoms or a zinc chelate compound of a diketone having 5 to 8 carbon atoms is contained, and these are heated to vaporize the solvent after applying the solution to a glass substrate or the like. At that time, since the compound itself does not contract due to the surface tension, it is possible to obtain a translucent zinc oxide thin film which is uniform and has excellent firing barrier properties.

[Brief description of drawings]

FIG. 1 is a graph showing the transmittance of a translucent zinc oxide thin film according to the present invention.

Claims (5)

[Claims] 1. A method comprising dissolving at least one zinc compound selected from the group consisting of a zinc salt of a fatty acid having 3 to 7 carbon atoms or a zinc chelate compound of a diketone having 5 to 8 carbon atoms in an organic solvent. A solution composition for forming a translucent zinc oxide thin film. 2. The solution composition according to claim 1, wherein the zinc salt is zinc n-valerate. 3. The solution composition according to claim 1, wherein the zinc salt is zinc n-caproate. 4. The solution composition according to claim 1, wherein the zinc chelate compound is zinc acetylacetonate. 5. The solution composition according to claim 1, wherein the concentration of the zinc compound is 1% by weight or more.