1. Synthesis of Mesoporous TiO₂/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (λ = 222 nm) Irradiation.
- Author
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Suzuki N, Okazaki A, Kuriyama H, Serizawa I, Hara A, Hirano Y, Nakabayashi Y, Roy N, Terashima C, Nakata K, Katsumata KI, Kondo T, Yuasa M, and Fujishima A
- Subjects
- Catalysis, Porosity, Boron chemistry, Diamond chemistry, Photochemical Processes, Titanium chemistry, Ultraviolet Rays
- Abstract
There is a need for highly efficient photocatalysts, particularly for water purification. In this study, we fabricated a mesoporous TiO₂ thin film on a boron-doped diamond (BDD) layer by a surfactant-assisted sol-gel method, in which self-assembled amphiphilic surfactant micelles were used as an organic template. Scanning electron microscopy revealed uniform mesopores, approximately 20 nm in diameter, that were hexagonally packed in the TiO₂ thin film. Wide-angle X-ray diffraction and Raman spectroscopy clarified that the framework crystallized in the anatase phase. Current⁻voltage (I⁻V) measurements showed rectification features at the TiO₂/BDD heterojunction, confirming that a p⁻n hetero-interface formed. The as-synthesized mesoporous TiO₂/BDD worked well as a photocatalyst, even with a small volume of TiO₂ (15 mm × 15 mm × c.a. 1.5 µm in thickness). The use of deep UV light (λ = 222 nm) as a light source was necessary to enhance photocatalytic activity, due to photo-excitation occurring in both BDD and TiO₂.
- Published
- 2018
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