Sol-Gel Preparation of Thick TiO<sub>2</sub> Films for Structural Coloration
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- Yasuda Takashi
- Kyushu Institute of Technology
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- Kojima Kei
- Kyushu Institute of Technology
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- Mori Ryoji
- Kyushu Institute of Technology
Abstract
<p>We studied sol-gel processing of thick and crack-free TiO2 films to synthesize structural color materials. The viscosity of the alkoxide-based precursor sols was stabilized by the addition of acetyl acetone, which improved control of the spin coating thickness. We used a TiO2/SiO2/TiO2 triple-layer structure and second-order reflection conditions to produce structural coloration. This design yielded a sharp spectral peak and bright coloration; however, a TiO2 layer with a thickness greater than 200 nm was required, which is much thicker than that required for the first-order of reflection. Crack formation in the thick films was suppressed by the addition of ethyl cellulose to the precursor sols. As a consequence, color-tuned TiO2/SiO2/TiO2 films were successfully prepared and exhibited various bright colors in the visible light wavelength range, including two primary colors of light, namely blue and green. Green coloration from flake-shaped particles was also demonstrated.</p>
Journal
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- Transactions of the Materials Research Society of Japan
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Transactions of the Materials Research Society of Japan 43 (3), 157-160, 2018-06-01
The Materials Research Society of Japan
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Details
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- CRID
- 1390845712967185280
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- NII Article ID
- 130007382927
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- ISSN
- 21881650
- 13823469
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed