研究目的
To synthesize structural color materials by preparing thick and crack-free TiO2 films using sol-gel processing, with a focus on achieving bright coloration through a TiO2/SiO2/TiO2 triple-layer structure and second-order reflection conditions.
研究成果
Crack-free TiO2 thick films for structural color materials were successfully fabricated using a sol-gel process with ethyl cellulose addition, enabling second-order reflection conditions for bright coloration. Test samples exhibited various bright colors, including blue and green, but red coloration was not achieved and requires modified optical design.
研究不足
The study notes uncertainty in thickness estimation due to color identification, potential mixing of colors (e.g., purple instead of pure red due to higher-order reflections), and the need for further optimization in optical design to achieve pure red coloration. The crack suppression mechanism with ethyl cellulose requires comparative studies with other polymers for better understanding.
1：Experimental Design and Method Selection:
The study employed sol-gel techniques for fabricating TiO2 and SiO2 films, with optical design based on numerical simulations using formulas from fundamental optics theory to calculate reflection and transmission spectra.
2：Sample Selection and Data Sources:
Precursor sols were prepared from titanium tetraisopropoxide (TTIP) and tetraethyl orthosilicate (TEOS), with additives like acetyl acetone and ethyl cellulose. Substrates were crown glass.
3：List of Experimental Equipment and Materials:
Equipment included a spin coater, fiber optic spectrometer (Ocean Optics USB4000), tuning folk vibration viscometer (A&D SV-1H), box furnace, hotplate, optical reflection microscope, and field emission scanning electron microscope. Materials included TTIP, TEOS, acetyl acetone, ethyl cellulose, Triton X-100, ethanol, hydrochloric acid, water, and methylcellulose.
4：Experimental Procedures and Operational Workflow:
Precursor sols were prepared with specific molar ratios, aged, and spin-coated onto substrates. Films were heated at 130°C for drying. Multilayer flakes were prepared by coating on a methylcellulose layer and dissolving it in water. Viscosity and thermogravimetry measurements were conducted.
5：Data Analysis Methods:
Reflection and transmission spectra were measured and analyzed using numerical simulations based on optical theory, with data fitting to determine film parameters.
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fiber optic spectrometer
USB4000
Ocean Optics
Measuring optical transmission and reflection spectra
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tuning folk vibration viscometer
SV-1H
A&D
Measuring viscosity of precursor sols
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titanium tetraisopropoxide
Wako Pure Chemical Industries
Precursor for TiO2 sols
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tetraethyl orthosilicate
Tokyo Chemical Industry (TCI)
Precursor for SiO2 sols
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acetyl acetone
Wako
Stabilizing agent for TiO2 sols
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ethyl cellulose
18-22 cps
TCI
Polymer binder to suppress crack formation
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Triton X-100
Wako
Non-ionic surfactant and wetting agent for SiO2 sols
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