KR20190053608A - Method for manufacturing structure for structural color - Google Patents

Abstract

The present invention relates to a production method of a structure for a structural color capable of displaying various colors on a single substrate. The production method according to one embodiment of the present invention comprises the steps of: forming a seed layer on the substrate; growing the seed layer by hydrothermal synthesis to form a first structural layer exhibiting a first structural color; and etching the first structural layer to form a second structural layer exhibiting a second structural color.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a structural color structure,

TECHNICAL FIELD The present invention relates to a structure, and more particularly, to a method of manufacturing a structure color structure.

Generally, colors are mostly chemical colors that are produced chemically, which is based on pigments. On the other hand, the color of structure is realized by reflection of incident light and tideland, and it is environment-friendly because it utilizes the characteristic of structure itself, and there is also an advantage of less discoloration due to light and compound material.

Recently, researches on various structural colors for making paints, cosmetics, fibers, sensors and anti-fake patterns have been conducted through various studies. However, in order to produce the structural color, it is necessary to fabricate a nanostructure having a size similar to the wavelength of light, and it is not easy to produce such a nanostructure uniformly over a wide range.

In addition, existing structure color fabrication methods have a limitation in that various colors can not be produced because one color is formed on one substrate.

Accordingly, the present invention provides a method of manufacturing a structural color structure capable of displaying various colors even on a single substrate.

A method of fabricating a structural color structure according to an embodiment of the present invention includes the steps of forming a seed layer on a substrate, growing a seed layer by hydrothermal synthesis to form a first structural layer exhibiting a first structural color, To form a second structure layer exhibiting a second structure color.

The first structural color may produce a structural color that exhibits different colors depending on the growth time.

The growth can proceed to less than 20 minutes.

According to the growth time, the first structural color may be changed in the order of brown, blue, yellow, orange, purple and green respectively, the growth time of brown is less than 1 minute and 30 seconds and the growth time of blue is 1 minute 30 seconds And the growth time of the yellow color is 5 minutes to 6 minutes, the growth time of the violet is 6 minutes to 7 minutes, and the growth time of the green color is 7 minutes to 8 minutes.

The seed layer may be formed of zinc oxide.

The hydrothermal synthesis can be carried out by mixing an aqueous solution of ZnCl ₂ at a concentration of 10 mM and an aqueous solution of NH ₄ OH at a concentration of ₅ μL / mL.

The hydrothermal synthesis can proceed to pH 10 at a temperature of 40 to 80 degrees.

The etch can be etched with HCl.

The second structural color may exhibit different colors depending on the etching time.

When a structural color is formed as in the present invention, various colors can be displayed on one substrate.

Further, by repeating the synthesis and the etching in the present invention, the color can be easily changed as required.

1 to 4 are views for explaining a method of manufacturing a structural color structure according to an embodiment of the present invention.
5 is a photograph of the structural color formed according to the embodiments of the present invention.
6 is an SEM photograph of a seed layer grown according to the present invention,
7 is a SEM photograph of the structure layers according to Examples 1 to 4 of the present invention,
8 is a graph showing diameters of the structure layers according to Examples 1 to 4 of the present invention.
FIG. 9 is a graph showing the thicknesses of the structure layers formed according to Examples 1 to 6 according to the present invention with time.
10 is a graph illustrating the thickness of a structure layer formed according to Examples 6 to 9 according to the present invention with time.
11 is a graph illustrating a diameter of a structure layer formed according to Examples 6 to 9 according to the present invention with time.
12 and 13 are photographs of the structural colors formed according to the embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Also, throughout the specification, when an element is referred to as " including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Also, throughout this specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" to another part. Also, when a part is referred to as " including " an element, it does not exclude other elements unless specifically stated otherwise.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 4 are views for explaining a method of manufacturing a structural color structure according to an embodiment of the present invention.

First, a seed layer 11 is formed on a silicon substrate 100 as shown in FIG.

In the seed layer 11, a solution prepared by dissolving 500 mM of Zn (NO ₃ ) ₂ and 0.1 g / ml of PVP (polyvinylpyrrolidone) in DMF (N, N-dimethylmethanamide) was prepared and spin-coated at 5000 rpm.

Thereafter, heat treatment is performed to remove PVP and DMF. At this time, the heat treatment can proceed for 5 minutes at approximately 500 degrees.

Then, as shown in Fig. 2, the seed layer is patterned to form the seed pattern 12. Then, as shown in Fig.

The seed pattern 12 can be formed by various methods depending on the size of the pattern. For example, when the size is small, it can be formed using a photolithography process using a photoresist. On the contrary, when the size is large, a tape T cut in a pattern shape to be formed may be formed on the seed layer. At this time, the tape is removed and the exposed seed layer becomes the seed pattern 12.

Then, as shown in Fig. 3, the seed pattern is grown to form the first structure layer 13. Then, as shown in Fig. At this time, the tape is removed and only the exposed seed pattern is grown, and the seed pattern can be grown by hydrothermal synthesis.

The thickness and diameter of the first structural layer formed according to the hydrothermal synthesis time may vary. At this time, hydrothermal synthesis proceeds in less than 20 minutes, and when proceeding for more than 20 minutes, irregular reflection occurs and a specific color can not be obtained.

In the hydrothermal synthesis method, an aqueous solution in which ZnCl ₂ is dissolved at a concentration of 10 mM and an aqueous solution in which 5 μL / mL of NH ₄ OH is mixed may be maintained at a temperature of 40 ° C to 80 ° C. At this time, the pH is maintained at 10 or more during the reaction.

The first structural color due to the first structural layer 13 may vary depending on the thickness and the diameter of the first structural layer 13 formed. As the thickness and the diameter of the first structural layer 13 increase, the colors of brown, Purple, and green.

As described above, by forming the seed pattern according to the embodiment of the present invention by hydrothermal synthesis, a structural color having various colors can be formed.

Thereafter, the first structure color obtained by the first structure layer 13 can be changed as required. The first structural color can be changed to an etching process as shown in FIG.

Referring to FIG. 4, the first structure layer formed in FIG. 3 is etched to form a second structure layer 15.

At this time, the tape can be removed and etching can be performed. If the mask is not formed with a separate mask pattern such as a tape, the seed layer can be removed together with the first structure layer formed in FIG.

Etching can be performed in various ways depending on the color of the structure to be obtained. At this time, the etching can be performed with an acid such as hydrochloric acid or sulfuric acid. The thickness and the diameter of the second structure layer 15 are changed according to the etching time and thus a second structure color different from the first structure color can be obtained.

In the above embodiments, the first structure layer is formed by hydrothermal synthesis, and the second structure layer is formed by etching. However, the present invention is not limited thereto, and the first structure layer may be formed, Or a fourth structural layer is formed by further etching in accordance with the pattern to form a third structural layer, or a second structural layer may be formed by hydrothermal synthesis or etching.

5 is a photograph of a structural color formed according to an embodiment of the present invention.

In Fig. 5, seed layers were grown by hydrothermal synthesis for different growth times to form structure layers of different sizes, and were photographed every 15 seconds of growth time.

As shown in FIG. 5, as the growth time increased, the structural color changed to brown, blue, yellow, orange, purple, and green.

Growth time to obtain brown is less than 1 minute 30 seconds, blue is 1 minute 30 seconds to 4 minutes, yellow is 4 minutes to 5 minutes, orange is 5 to 6 minutes, violet is 6 to 7 minutes, 7 to 8 minutes.

Hereinafter, embodiments according to the present invention will be described. The following examples are only illustrative of the present invention and are not intended to limit the scope of the present invention.

[Example 1]

A zinc oxide seed layer was formed on the silicon substrate. A seed layer was prepared by dissolving 500 mM of Zn (NO ₃ ) ₂ and 0.1 g / ml of PVP (polyvinylpyrrolidone) in DMF (N, N-dimethylmethanamide) and spin coating at 5000 rpm.

Thereafter, a seed layer was grown by hydrothermal synthesis for 1 minute to form a structure layer.

 [Example 2]

In Example 1, a structure layer was formed in the same manner as in Example 1, except that the seed layer was grown for 2 minutes.

[Example 3]

In Example 1, a structure layer was formed in the same manner as in Example 1, except that the seed layer was grown for 3 minutes.

[Example 4]

In Example 1, a structure layer was formed in the same manner as in Example 1, except that the seed layer was grown for 4 minutes.

[Example 5]

In Example 1, a structure layer was formed in the same manner as in Example 1, except that the seed layer was grown for 5 minutes.

[Example 6]

In Example 1, a structure layer was formed in the same manner as in Example 1, except that the seed layer was grown for 6 minutes.

[Example 7]

The structure layer grown in Example 4 was etched with diluted HCl for 1 minute.

[Example 8]

A structure layer was formed in the same manner as in Example 7, except that the structure layer grown in Example 4 was etched for 2 minutes.

[Example 9]

A structure layer was formed in the same manner as in Example 7, except that the structure layer grown in Example 4 was etched for 3 minutes.

7 is a SEM photograph of the structure layer according to Examples 1 to 4 of the present invention, and Fig. 8 is a SEM photograph of the structure layer according to Embodiments 1 to 4 of the present invention. Fig. The diameter of which is measured.

7 (a), 7 (b), 7 (c) and 7 (d) are SEM photographs of the structure layers formed according to Examples 1, 2, 3 and 4, respectively.

Referring to FIGS. 6 to 8, it can be seen that the particle diameter of the structural layer made of zinc oxide increases with an increase in growth time. As a result, the diameter increases at a rate of 20 nm / min have.

FIG. 9 is a graph showing the thicknesses of the structure layers formed according to Examples 1 to 6 according to the present invention with time.

Referring to FIG. 9, the thickness of the structural layer made of zinc oxide increased with time, and it was confirmed that the thickness varied at a rate of 44 nm / min.

FIG. 10 is a graph showing the thicknesses of the structure layers formed according to Examples 6 to 9 according to the present invention with time, FIG. 11 is a graph showing the relationship between the thicknesses of the structure layers formed according to Examples 6 to 9 And the diameters of the holes are measured.

Referring to FIG. 10, the thickness of the structure layer decreases as the etching time increases, and the thickness decreases at a rate of 39 nm / s when measured. Referring to FIG. 11, it can be seen that the diameter of the structure layer decreases as the etching time increases, and decreases at a rate of 14 nm / s when measured.

12 and 13 are photographs of the structural colors formed according to the embodiments of the present invention.

12 is a photograph of the structural color formed according to Examples 1 to 6. FIG.

Referring to FIG. 12, Example 1, which was grown for 1 minute, was blue for Examples 2 to 4, which was grown for 2 minutes to 4 minutes, Example 5, which was grown for 5 minutes, It can be seen that the orange color is shown in Example 6.

Fig. 13 (a) is a structural color formed according to Example 4, and Fig. 13 (b) is a structural color formed according to Example 7. Fig.

The structure color of Example 4 grown for 4 minutes as in FIG. 13 (a) is blue, and the structure color according to Example 7 formed by etching for 1 minute is as shown in FIG. 13 (b) .

As described above, when the structure layer is formed as in the present invention, the second structure color different from the first structure color can be obtained by the first structure chromaticity etching formed by growing the seed layer. At this time, if the etching time is changed, various second structure colors can be obtained according to the etching time.

Therefore, any pattern having various colors can be expressed in various colors by repeating synthesis and etching. Further, even if an undesired structural color is obtained by synthesis or etching, the desired color can be changed by synthesizing or etching again.

 While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

Claims (10)

Forming a seed layer on the substrate,
Growing the seed layer by hydrothermal synthesis to form a first structural layer exhibiting a first structural color,
Etching the first structural layer to form a second structural layer exhibiting a second structural color;
And a step of forming the structural color structure. The method of claim 1,
Wherein the first structural color exhibits different colors depending on the growth time. 3. The method of claim 2,
Wherein the growth progresses to less than 20 minutes. 4. The method of claim 3,
Wherein the first structural color changes in the order of brown, blue, yellow, orange, purple and green according to the growth time. 5. The method of claim 4,
The brown growth time was less than 1 minute 30 seconds,
The blue growth time is 1 minute 30 seconds to 4 minutes,
The yellow growth time is 4 minutes to 5 minutes,
The orange growth time is 5 minutes to 6 minutes,
The purple growth time is 6 to 7 minutes,
Wherein the green growth time is from 7 minutes to 8 minutes. The method of claim 1,
Wherein the seed layer is formed of zinc oxide. The method of claim 6,
Wherein the hydrothermal synthesis is carried out by mixing an aqueous solution of ZnCl ₂ at a concentration of 10 mM and an aqueous solution of NH ₄ OH at a concentration of 5 μL / mL. 8. The method of claim 7,
Wherein the hydrothermal synthesis method is carried out at a temperature of 40 to 80 degrees and at a pH of 10. The method of claim 1,
Wherein the etching is performed with HCl. The method of claim 1,
And the second structural color exhibits different colors according to the etching time.

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