KR102011040B1 - Color Coating layer using metal nano structure and the method for manufacturing the same - Google Patents

Abstract

The present invention discloses an optical coating layer and a method for manufacturing the same, forming a plurality of protruding or recessed metal nanostructures having a visible light wavelength or less on a metal surface, and enabling vivid colors while maintaining the gloss of metals.

Description

Color coating layer using metal nano structure and the method for manufacturing the same

The present invention relates to a color coating layer using a metal nanostructure and a method of manufacturing the same, and specifically, to form a protruding or recessed metal nanostructure array having a visible light wavelength or less on the metal surface to maintain a vivid color while maintaining the unique gloss of the metal The present invention relates to a color coating layer and a method of manufacturing the same.

Conventionally, as a technology for realizing the surface color of an object, an optical material that realizes a variety of colors by coating a surface material or a material such as an oxide in multiple layers to induce the effect of the interference of light as a technique for implementing the surface color of the object The method of coating, or simply coating some transition metals and transition metal nitride-based materials to achieve a metal gloss has been mainstream.

However, the use of paints is advantageous to realize paint-specific colors, but it is difficult to achieve high-quality gloss such as metallic gloss, and is susceptible to heat or ultraviolet rays. Transition metal and nitride coating technology is limited by the color of the material itself. The disadvantage is that only color can be implemented. In addition, the method of realizing the color by the interference effect of light using the multilayer film is possible to implement a variety of colors by the selection of the structure and material of the multilayer film, but the uniformity of the color should be well controlled the thickness of the deposited multilayer film In addition, it is possible to guarantee the reproducibility, and in particular, when applied to a three-dimensional structure such as a mobile phone, it is difficult to secure uniformity of thickness, which makes it difficult to maintain color uniformity.

In order to solve this problem, there has been a study to realize the color by forming a nanostructure on the metal surface. United States Patent Application Publication No. 2012/0015118 entitled "METHOD AND DEVICE FOR CONTROLLING THE COLOR OF METALS" has been published. This technique forms a nanostructure on the surface of the metal and displays the color by using characteristic light absorption phenomena due to surface plasmon excitation.

However, even with this technology, a range of brightness, saturation and color ranges are not secured, and there are disadvantages in that the structure is complicated and process costs are increased due to the limitation of the material. Therefore, the range of color reproduction can be expanded by simple structure and low cost process. There is an urgent need for a metallic color coating layer.

The present invention has been proposed to overcome the problems of the conventional color coating technology as described above, and to provide a metal surface nanostructured coloring technology and a manufacturing process that can implement a variety of high-definition color while maintaining the aesthetic gloss inherent in the metal. .

In order to achieve the above object, the present invention selects a non-noble metal absorbing metal material and forms a protruding or recessed nanostructure pattern having a visible light wavelength or less on the surface of the metal surface to greatly improve the color clarity and color implementation range It provides a coloring technique and a method of manufacturing the same.

One side of the present invention comprises a metal layer and a plurality of metal nanostructures arranged on the surface of the metal layer, the metal of the metal layer provides a color coating layer having a reflectance of 30% to 80% in the 300nm to 800nm wavelength band.

Preferably, the metal of the metal layer is selected from among Pd, Ni, Co, Fe, Mn, Cr, Mo, W, V, Ta, Nb, Hf, Zr, Ti, In, Sn, Pb, Sb, Bi and their alloys. Can be selected.

In addition, it may be desirable that the metal of the plurality of metal nanostructures has a reflectance of 30% to 80% in the wavelength range of 300 nm to 800 nm.

Meanwhile, the plurality of metal nanostructures may be the same metal as the metal of the metal layer or a different metal. The plurality of metal nanostructures are protruding or recessed.

In addition, the metal layer may be coated on a base material, or a buffer layer may be further added between the metal layer and the plurality of metal nanostructures.

Another aspect of the invention is a metallic ceramic layer; And a plurality of nanostructures arranged on the surface of the metallic ceramic layer, wherein the metallic ceramic provides a color coating layer having a reflectance of 30% to 80% in a wavelength band of 300 nm to 800 nm.

Another aspect of the invention includes preparing a metal layer and forming a plurality of metal nanostructures arranged on the surface of the metal layer, the metal of the metal layer has a reflectance of 30% to 300nm to 800nm wavelength band It provides a method for producing a color coating layer of 80%.

Preferably, the forming of the plurality of metal nanostructures may be performed using an electroplating method, or another method may be an imprint method. In the case of using the electroplating method, there is an advantage that a simpler and cheaper process can be obtained.

Metal surface nano-coloring technology according to the present invention is not only possible to implement a variety of high-definition color of the high-definition, but also easy and inexpensive mass production by simply selecting the metal material and control the geometric structure without a separate coloring layer while maintaining the inherent gloss of the metal Provide a process.

In addition, the metal color coating technology according to the present invention can be applied as a color filter, colorimetric sensor, etc. for a reflective display application as well as a metallic gloss decoration effect.

1A and 1B are cross-sectional schematic diagrams of a color coating layer according to an embodiment of the present invention.
2 is a schematic plan views of a color coating layer according to an embodiment of the present invention.
3A and 3B show light reflectance spectrum calculation results when an Al metal surface is formed into a hexagonal lattice-shaped circular nanodisk array into a protrusion (FIG. 3A) and a depression (FIG. 3B) structure.
FIG. 4 shows the reflectance spectra measured for the primary primary colors of red, blue and green and the secondary color standard specimens of cyan and magenta.
FIG. 5A is a graph showing the reflectance of a metal according to a wavelength, and FIG. 5B is a vertical axis of a corresponding k value when a horizontal axis is n as an optical constant, n (refractive index) and k (dissipation coefficient) of a metal according to a wavelength. The graph shown.
FIG. 6A is a graph showing light reflection spectrum simulation results of a color coating layer in which a circular nanostructure array is formed in a recessed structure to form a hexagonal lattice structure on a nickel (Ni) substrate according to an embodiment of the present invention, and FIG. 6B is a diagram of FIG. This graph shows the reflectance curve when the depth of Ni metal nano structure hole is increased to 200 nm in the structure of 6a.
FIG. 7 is a graph showing a change in reflectivity curve when Cr metal is used instead of Ni for the same structure as that of FIG. 6A.
FIG. 8 is a result of simulating a reflectance curve when a protruding nanodisk array is formed in a hexagonal lattice structure at a thickness of 100 nm on a Ni substrate surface.
9 is a graph showing the effect of duty cycle on the reflectivity curve for a 50 nm thick Ni nanodisk array formed on a Ni substrate.
10A to 10C are flowcharts illustrating a method according to an example of manufacturing the protruding color coating layer of the present invention.
11A to 11C are flowcharts illustrating a method according to an example of manufacturing the recessed color coating layer of the present invention.
12 is a view showing the L ^* C ^* h color space of the brightness, saturation, color that can be implemented according to the present invention.
FIG. 13 is a graph illustrating another example of a structure in which a metal layer is formed on a separate substrate and a nanostructure pattern is formed thereon. FIG.
14 is a view showing an example of manufacturing the nanostructure pattern according to the present invention in an two-dimensional anisotropic shape.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings, and like reference numerals designate like elements, and redundant description thereof will be omitted. The suffix "part" for components used in the following description is given or mixed in consideration of ease of specification, and does not have meanings or roles that are distinguished from each other. In addition, in describing the embodiments disclosed herein, when it is determined that the detailed description of the related known technology may obscure the gist of the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, but are not limited to the technical spirit disclosed herein by the accompanying drawings, all changes included in the spirit and scope of the present invention. It should be understood to include equivalents and substitutes.

1A and 1B are schematic cross-sectional views of the color coating layer 1 according to the embodiment of the present invention.

The color coating layer 1 according to the present invention comprises a metal layer 110 and a plurality of metal nanostructures 120 arranged in a predetermined cycle in a protruding manner thereon, as shown in Figure 1a, or a metal layer as shown in Figure 1b The surface may be configured to have a plurality of metal nanostructures 130 recessed therein. The plurality of metal nanostructures are formed in a size d with a period P. And the thickness of the protrusion and the depth of the depression is represented by t.

The pattern size (d) of the metal nanostructures 120 and 130 may be manufactured to 20 nm or more and less than 750 nm, and the period P may be manufactured to be 200 nm to 800 nm. The protruding height t of the protruding die can be produced in 10 to 300 nm, and the depression depth t of the depressed die can be produced in 10 to 300 nm.

On the other hand, the shape of the protruding shape can be manufactured in various kinds of shapes that are not particularly limited, such as circles, hexagons, squares, triangles, etc., and the shape of the recessed shape is also various shapes that are not particularly limited, such as circles, hexagons, squares, triangles, etc. It can be prepared by.

Figure 2 shows the nanostructure shape and geometrical arrangement applicable to the surface nanostructure pattern of the color coating layer according to the present invention. It may have a geometric arrangement of one-dimensional lattice structure such as linear nanowire array and two-dimensional lattice structure such as square or hexagonal lattice. The nanostructure shape of the lattice structure is applicable to various shapes including the illustrated square and circular structures.

According to the present invention, surface plasmon excitation occurs due to the nanostructure patterns formed on the surface of the metal base material, and selective light absorption occurs strongly in a specific wavelength band by coupling with the lattice mode. As a result, the color coating layer 1 may exhibit a beautiful color. In more detail, when light is incident, surface plasmon waves are excited by nanostructure patterns formed on the metal surface. In this case, since the metal nanostructure patterns form a periodic lattice structure, an extraordinary optical absorption (EOA) phenomenon occurs in a specific wavelength band where coupling between the lattice mode and the surface plasmon mode occurs. The spectrum where specific light absorption occurs varies depending on the lattice geometry, such as the type of metal and surroundings, the shape, size, and period of the nanostructure, especially its central wavelength predominantly depending on the lattice period. Have the characteristics determined.

In the present invention, by effectively controlling the specific light absorption behavior generated in the nanostructure pattern of the periodic lattice structure formed on the metal surface in the material and optical aspects, it is possible to change the reflection spectrum from the metal surface and to realize aesthetic metallic gloss and high-definition color Provides surface nanostructured coloring techniques.

First, in order to realize color using the metal nanostructure, limited materials such as precious metal materials having low light absorption loss of the metal itself are used so that the surface plasmon resonance phenomenon can appear without loss. For example, metals selected from Au, Ag, Cu, Al and their alloys have been predominantly used. Such a group of metals is generally known to correspond to a metal having a relatively high reflectance and well exciting surface plasmons. However, in the present invention, it was confirmed that it may be more effective to use a group of metals that cause attenuation of the surface plasmon than the metal for exciting the surface plasmon well. Such metals generally have relatively low reflectances, such as 30% to 80%.

3A and 3B are examples of the technique for the above-described case, and the light when the Al metal surface is formed into a hexagonal lattice structure of a circular nanodisk array into a protrusion (FIG. 3A) and a depression (FIG. 3B) structure. The reflectance spectrum results are shown.

The thickness of the protrusions and depressions was the same at 50 nm, and the period was varied from 400 nm to 700 nm in 100 nm intervals. The duty cycle, which is the ratio of the diameter of the nanostructure to the cycle, was fixed at 50%. In both cases, the visible light showed a high reflectance of about 90% in the wavelength range, and the sharp and deep reflectance? (Dip) was formed by the specific light absorption phenomenon. The reflectivity – the central wavelength of light absorption – is red-shifted in proportion to the lattice period, thereby adjusting the subtractive color. The implemented colors are represented by the CIE L ^* C ^* h coordinate system specified by the International Commission on Illumination, for the period 400 nm, 500 nm, 600 nm and 700 nm for the projecting structure (94.4, 6.8, 110.1), (92.6 , 23.4, 101.0), (92.0, 25.9, 323.2), (91.77, 12.1, 194.3), and (95.9, 1.4, 118.9), (93.8, 20.1, 110.8), (94.3) for recessed structures, respectively. , 17.8, 327.4) and (93.0, 9.2, 163.4).

CIE L ^* C ^* h color coordinates represent the CIE L ^* a ^* b ^* coordinate system in polar coordinates, where L ^* is lightness, C ^* is chroma, and h is hue. The L ^* values have numbers that vary from 0 to 100, where 0 represents the test and 100 represents the fully reflective diffuser. Therefore, in the case of Al nanostructure color coating layer, the brightness value is very high as 90 or more, while the saturation value is relatively low. In this case, the color to be expressed is not bright and has a light pastel color.

In order to refer to the vivid color reference, the reflectance spectra of Macbeth ColorChecker standard color specimens were measured using a spectrophotometer equipped with an integrating sphere. FIG. 4 shows the reflectance spectra measured for the primary primary colors of red, blue and green and the secondary color standard specimens of cyan and magenta. Compared to the reflectivity curves of FIGS. 3A and 3B, the remarkable difference is that the overall reflectivity is formed very low. It can be seen that even the reflection of the central color peak is only about 30% to 40%.

Table 1

Table 1 summarizes the CIE L ^* a ^* b ^* color coordinate system provided for some standard color specimens including the color of FIG. 4 into CIE L ^* C ^* h color coordinate system under D ₆₅ light source (daylight) conditions. It can be seen that the overall brightness value is formed low, and the saturation value has a relatively high value. CIE L ^* C ^* h color space has a spherical shape with L ^* as the central axis. When L ^* is limited to a high value, the color clarity is low and the color range that can be implemented is also the upper end of the color space sphere. It will be extremely limited. In conclusion, it is necessary to lower the brightness value of the metal nanostructured color coating layer in order to realize vivid colors and expand the color range.

To this end, in the present invention, the use of a lossy metal having a relatively low reflectance is one of the main characteristic configurations. In the present invention, a metal having a relatively low reflectance of about 30% to 80% in the visible light region of the wavelength range of 380nm to 780nm is used. Thus, preferably, metals selected from Pd, Ni, Co, Fe, Mn, Cr, Mo, W, V, Ta, Nb, Hf, Zr, Ti, In, Sn, Pb, Sb, Bi and alloys thereof This is possible.

Even an alloy containing a metal having high reflectance can be employed in the present invention if an alloy to a metallic ceramic having a relatively low reflectance is produced at a wavelength range of 380 nm to 780 nm at a reflectance of about 30% to 80%. Preferably, metal nitrides, carbides such as Ti-N, Al-N, Cr-N, Zr-N, Ti-C, Cr-C, Fe-C, Co-C, Ni-C, Zr-C, and Mixtures thereof or the adoption of compounds may be effective. Since these metallic nitrides and carbides exhibit characteristic spectra depending on their composition, unlike white metals having a constant reflectance spectrum in the entire visible light region, the metallic nitrides and carbides have a characteristic color and metallic gloss. In addition, depending on the composition, the reflectance range can be reduced to a level of 30%. If these materials are used as the base material and the surface is nanostructured, the spectral deformation due to the nanostructured structure is added to the spectrum of the material itself, and thus the color variability and the color range are realized. You get the effect of expanding more.

On the other hand, metal materials do not have many materials to lower the reflectivity to 50% or less, whereas metallic nitride, carbides, and mixtures or compounds may be relatively easy to reduce the reflectivity to 50% or less depending on the composition. There is an advantage. That is, since the lower limit of the reflectivity of the metal material is limited, it may be effective to apply an alloying material such as metal nitride or carbide as a method of compensating for this. Thus, more preferably, the reflectivity of the aforementioned metallic nitrides, carbides and mixtures thereof or compounds may be 30% to 50%.

5A is a graph showing reflectance of metals with respect to wavelengths. Referring to FIG. 5A, reflectivity of metals such as Au, Ag, and Al, which are usefully used as plasmonic matters, is greater than 80% in the wavelength range of 300 nm to 800 nm. As described above, the present inventors have found that when a metal having high reflectivity and excellent plasmonic resonance characteristics is used, it is difficult to realize vivid color and to have a high value even in chromaticity.

FIG. 5B is a graph showing the vertical axis of the corresponding k value when the optical axis, n (refractive index) and k (dissipation coefficient) of the metal according to the wavelength are n. The optical constant values are shown by taking values in the wavelength range from 300 nm to 800 nm. Referring to Figure 3b, it can be seen that the n, k value dispersion behavior of the metal material is largely divided into two regions. A material group adjacent to the vertical axis such as Al, Ag, Au is a representative plasmonic material, because the n value is very small and the k value has a dispersion behavior that increases in proportion to the wavelength, and thus the absorption loss of the material itself is high, indicating high reflectivity. On the other hand, in the graphs of the horizontal axis n and the vertical axis k, the metals in the intermediate region have a large absorption loss of the material itself and show relatively low reflectivity because the imaginary imaginary term defined as 2nk increases. Referring to FIG. 5A, it can be seen that these material groups correspond to metals having a relatively low reflectance of about 30% to 80% in the 300 nm to 800 nm wavelength band.

FIG. 6A is a graph showing light reflectance spectrum simulation results for a color coating layer in which a circular nanostructure array is formed in a recessed structure to form a hexagonal lattice structure on a nickel (Ni) substrate according to an exemplary embodiment of the present invention. The result is calculated by changing the cycle only from 400 nm to 600 nm at 100 nm intervals with the depth of the depression 100 nm and the duty cycle fixed at 50%. Compared to the Al substrate case of Fig. 3, the lattice period dependence is still pronounced, but the remarkable decrease in the basic reflectivity and the reflectance? You can see the widening of the curve. In the case of the periodic lattice-structured nanostructure pattern formed on the metal matrix, in spite of the surface plasmon attenuation caused by the combination of optical constants of the metal itself, the enhanced light-absorption substrate through the coupling with the lattice mode is operated, so that the specific light-absorption phenomenon occurs. It is believed that this appears.

If the CIE L ^* C ^* h coordinate values are obtained from the reflectivity curve of Fig. 6a, for (72.4, 31.9, 89.6), (72.7, 29.2, 6.7), (62.1, 18.8, 269.6). Compared to the Al substrate, the brightness value is significantly lowered, and the saturation value is also increased to 31.9.

FIG. 6B shows a reflectance curve when the depth of the Ni metal nanostructure hole in the structure of FIG. 6A is increased to 200 nm. In comparison with FIG. 6A, the reflectivity? It can be seen that the center wavelength of the curve moves to the long wavelength region and the half width increases. L ^* C ^* h coordinate values are (68.8, 36.9, 82.9), (61.7, 38.4, 341.0), (55.9, 36.9, 212.9) for periods 400 nm, 500 nm and 600 nm, respectively. As the height of the recessed metal nanostructure pattern increases, the brightness value of the implementation color is further reduced, and the saturation value is significantly increased.

FIG. 7 shows the change in reflectivity curve when Cr metal is used instead of Ni for the same structure as in FIG. 6A. Although the overall trend is similar, it can be seen that the basic reflectivity curve is flat along the reflectance spectral characteristics of the metal itself rather than inclined to a short wavelength region unlike Ni. The CIE L ^* C ^* h coordinate values have values of (77.4, 13.6, 110.4), (74.6, 17.9, 67.0), (69.9, 35.3, 299.9) for periods 400 nm, 500 nm, and 600 nm, respectively.

FIG. 8 shows simulation results of reflectivity curves when a protruding nanodisk array is formed in a hexagonal lattice structure at a thickness of 100 nm on a Ni substrate surface. Compared with the recessed structure of FIG. 6A, the total reflectivity is significantly lowered to 50% or less, and the half width is also very wide. The CIE L ^* C ^* h coordinate system shows values of (40.2, 41.0, 57.9), (40.4, 65.3, 315.5), and (43.3, 48.5, 234.0) for periods 400 nm, 500 nm, and 600 nm, respectively. Brightness was greatly lowered to about 40, and the saturation value also increased to a maximum of 65.3.

9 is a graph showing the effect of duty cycle on the reflectivity curve for a 50 nm thick Ni nanodisk array formed on a Ni substrate. For the hexagonal lattice period 400 nm, as the diameter of the nanodisk is increased by 50 nm from 200 nm to 250 nm, the red shift of the central wavelength of light absorption and the half width of the light absorption curve can be confirmed. The CIE L ^* C ^* h coordinate values varied from (70.9, 32.6, 86.2) to (65.2, 40.5, 77.42).

Referring to the case where the period of FIG. 9 is 200 nm, it can be seen that the shape of the reflectivity curve can be gradually increased only in one direction of the wavelength. Also in this case, as the diameter of the nanodisk is increased from 100 nm to 150 nm, it can be seen that the reflectivity boundary wavelength is shifted to the long wavelength. The L ^* C ^* h coordinate system changed from (70.1, 23.9, 84.1) to (57.9, 49.3, 44.2). In particular, it can be seen that the reflectivity is kept low throughout the short wavelength region, which shows that a spectrum similar to the red and yellow standard specimen reflectivity curve can be realized depending on the structure and material design.

 The pattern size of the metal nanostructures 120 may be manufactured to 20 nm or more and less than 750 nm, and the period may be 200 nm to 800 nm. If the size of the pattern is 200nm or more, the photolithography process can be used instead of the expensive process such as e-beam lithography, and the metal nanostructure coating layer has a large area in a low-cost process such as electroplating and imprinting after master mold duplication. It is possible to produce.

The protruding height of the protruding die can be produced in 10 to 300 nm, and the depression depth of the depressed die can be produced in 10 to 300 nm.

On the other hand, the shape of the protruding shape can be manufactured in various kinds of shapes that are not particularly limited, such as circles, hexagons, squares, triangles, etc., and the shape of the recessed shape is also various shapes that are not particularly limited, such as circles, hexagons, squares, triangles, etc. I can manufacture it

10A to 10C are flowcharts illustrating a method according to an example of manufacturing the protruding color coating layer of the present invention.

Referring to FIG. 10A, first, a metal layer 110 is prepared. The metal layer 110 may be a metal surface of any object, or may be formed separately from the metal layer. For example, when the color coating layer of the present invention is to be formed on the back side of the mobile phone, as described above, a metal or alloy layer having a relatively low reflectance of about 30% to 80% in the 300nm to 800nm wavelength band may be formed. In this case it can be seen as a metal layer (110). In addition, when the back surface of the mobile phone is made of a metal or alloy layer having a relatively low reflectance of about 30% to 80% in the 300nm to 800nm wavelength band, the surface may be referred to as the metal layer 110.

Next, referring to FIG. 10B, the protruding metal nanostructure 120 is formed using a plating mold. The protruding metal nanostructure 120 may be the same metal as the metal layer 110 or may be another metal. However, it may be more effective to realize the object of the present invention that the protruding metal nanostructure 120 is made of a metal or an alloy layer having a relatively low reflectance of about 30% to 80% in the 300nm to 800nm wavelength band. .

Referring to FIG. 10C, the plating mask is removed to complete manufacture of the color coating layer.

11A to 11C are flowcharts illustrating a method according to an example of manufacturing the recessed color coating layer of the present invention.

Meanwhile, in FIGS. 10A to 10C and 11A to 11C, the method of manufacturing the color coating layer by electroplating has been described, but the manufacturing of the color coating layer is not limited thereto. Alternatively, a nanoimprint method may be used. According to this method, the imprint of the shape of the protruding metal nanostructure or the recessed metal nanostructure on the metal layer is imprinted and manufactured.

12 is a diagram illustrating an L ^* C ^* h color space of brightness, saturation, and color. Referring to FIG. 12, as the brightness increases, the saturation value may have a relatively small range of values. The inventors of the present invention, when the color coating layer of the present invention is manufactured from a metal or alloy layer having a relatively low reflectance of about 30% to 80% in the 300nm to 800nm wavelength band, the appropriate brightness is secured, and the saturation and color implementation range are greatly expanded. It has been found that a color coating layer can be realized.

The color implemented in the case of the conventional high reflectivity metal is in the high brightness region where the L ^* value is 80 or more, so that the sharpness of the color is lowered and there is a clear limitation in the range of color implementation as can be seen from the volume occupied in the L ^* C ^* h color space. . According to the present invention, by greatly expanding the brightness control range to 30≤L ^* ≤80 through the control of the metal and the geometry having low reflectivity, it is possible to produce a color coating layer that can significantly extend the color range as well as color sharpness. have.

In addition, metals such as Ni and Cr are very advantageous for producing metal products having nanostructured surfaces at low cost by using the electroforming process. It is also possible to use an alloy of Cu, Sn, Zn and the like to reduce the allergen effect.

FIG. 13 is a graph illustrating an example of a structure in which the metal layer 110 is formed on a base material 100, such as a separate substrate, and the metal nanostructure patterns 120 and 130 are formed thereon. In addition, a separate buffer layer (not shown) may be inserted between the metal layer 110 and the metal nanostructure patterns 120 and 130. The buffer layer is preferably a metal, and among Pd, Ni, Co, Fe, Mn, Cr, Mo, W, V, Ta, Nb, Hf, Zr, Ti, In, Sn, Pb, Sb, Bi, and alloys thereof It is possible to employ selected metals.

In addition, as illustrated in FIG. 14, the nanostructure pattern according to the present invention may be manufactured in an anisotropic two-dimensional shape. In this case, different colors may be implemented according to the viewing direction.

It is also possible to alternately arrange two or more patterns having different periods for the mixed color effect. In this way, green and orange colors having reflectance peaks in the intermediate region in the visible region can be realized.

On the other hand, the metal nanostructure color coating layer technology according to the present invention is produced in the form of a metal flake can be applied to the technology, such as paint as a metal effect pigment.

The color coating layer described above is not limited to the configuration and method of the above-described embodiments, but the embodiments may be configured by selectively combining all or some of the embodiments so that various modifications can be made. It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (18)

Metal substrate; And
A plurality of metal nanostructures are periodically arranged on the surface of the metal substrate,
The plurality of metal nanostructures have a reflectance of 30% to 80% in the wavelength range of 300 nm to 800 nm.
No permeation through the metal substrate,
The color coating layer formed on the metal substrate, characterized in that the plurality of metal nanostructures are protruding or recessed.
The method of claim 1,
The metal of the metal substrate is at least one of Pd, Ni, Co, Fe, Mn, Cr, Mo, W, V, Ta, Nb, Hf, Zr, Ti, In, Sn, Pb, Sb, Bi, and alloys thereof Color coating layer formed on the metal substrate, characterized in that selected.
delete According to claim 1,
The color coating layer is formed on the metal substrate, characterized in that the plurality of metal nanostructures are the same metal or different metal than the metal of the metal substrate.
delete delete delete delete delete delete Preparing a metal substrate; And
Forming a plurality of metal nanostructures periodically arranged on a surface of the metal substrate;
The plurality of metal nanostructures have a reflectance of 30% to 80% in the wavelength range of 300 nm to 800 nm, and no transmission through the metal substrate.
The method of manufacturing a color coating layer formed on a metal substrate, characterized in that the plurality of metal nanostructures are protruding or recessed.
The method of claim 11, wherein
Forming the plurality of metal nanostructures is a method of manufacturing a color coating layer formed on a metal substrate using an electroplating method.
The method of claim 11, wherein
The forming of the plurality of metal nanostructures is a method of manufacturing a color coating layer formed on a metal substrate using an imprint method.
The method of claim 11, wherein
The metal of the metal substrate is at least one of Pd, Ni, Co, Fe, Mn, Cr, Mo, W, V, Ta, Nb, Hf, Zr, Ti, In, Sn, Pb, Sb, Bi, and alloys thereof A method of manufacturing a color coating layer formed on a metal substrate, characterized in that selected.
delete The method of claim 11, wherein
And forming the plurality of metal nanostructures on the metal substrate, wherein the plurality of metal nanostructures are the same metal or different metal from the metal of the metal substrate.
delete delete

Images