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ID 118722
著者
Dong, Yusong The University of Auckland|The MacDiarmid Institute for Advanced Materials and Nanotechnology|The Dodd-Walls Centre for Photonic and Quantum Technologies
Fujisaka, Ai Tokushima University
Sun-Waterhouse, Dongxiao The University of Auckland
Waterhouse, Geoffrey I. N. The University of Auckland|The MacDiarmid Institute for Advanced Materials and Nanotechnology|The Dodd-Walls Centre for Photonic and Quantum Technologies
資料タイプ
学術雑誌論文
抄録
Colloidal crystal templating is a simple yet remarkably versatile synthetic strategy toward inverse opal (IO) photonic crystals for optical sensing and catalytic applications. Herein, we report the successful fabrication of tantalum (V) oxide, Ta2O5, inverse opal thin films and powders using the colloidal crystal templating method, utilizing poly(methyl methacrylate) (PMMA) colloidal crystals as sacrificial templates and TaCl5 as the tantalum source. The Ta2O5 IO thin films and powders showed structural color at ultraviolet (UV) and visible wavelengths, with the photonic band gap (PBG) position along the [111] direction increasing linearly with the diameter of macropores (D) in the inverse opals and also the refractive index of the medium filling the macropores, in excellent accord with a modified Bragg’s law expression. Thermal ammonolysis of the Ta2O5 inverse opals at 700 °C yielded well-ordered Ta3N5 IO films and powders possessing high specific surface areas (37 m2 g–1) and a semiconductor band gap of 2.0–2.1 eV. A Pt/Ta3N5 IO photocatalyst delivered a H2 production rate of ∼300 μmol g–1 h–1 in aqueous methanol (10 vol % MeOH) under visible-light irradiation (300 W Xe lamp, λ ≥ 420 nm), approximately twice that achieved using conventional Pt/Ta3N5 powder photocatalysts (161 μmol g–1 h–1, 8.4 m2 g–1). Results demonstrate that inverse opal engineering is an effective approach for realizing Ta2O5 IO thin films for sensing applications and Ta3N5 IOs with enhanced photocatalyst performance.
掲載誌名
Chemistry of Materials
ISSN
08974756
15205002
cat書誌ID
AA10699608
AA12096771
出版者
American Chemical Society
35
19
開始ページ
8281
終了ページ
8300
発行日
2023-09-21
権利情報
This article is licensed under CC-BY-NC-ND 4.0 (https://creativecommons.org/licenses/by-nc-nd/4.0/).
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出版社版DOI
出版社版URL
フルテキストファイル
言語
eng
著者版フラグ
出版社版
部局
理工学系