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首页> 外文会议>Nanophotonics Australasia 2017 >Surface Modification of Nanoporous Anodic Alumina Photonic Crystals for Photocatalytic Applications
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Surface Modification of Nanoporous Anodic Alumina Photonic Crystals for Photocatalytic Applications

机译：用于光催化应用的纳米多孔阳极氧化铝光子晶体的表面改性

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摘要

Herein, we report on the development of a rationally designed composite photocatalyst material by combining nanoporous anodic alumina-rugate filters (NAA-RFs) with photo-active layers of titanium dioxide (TiCh). NAA-RFs are synthesised by sinusoidal pulse anodisation and subsequently functionalised with TiO: by sol-gel method to provide the photonic structures with photocatalytic properties. We demonstrate that the characteristic photonic stopband (PSB) of the surface-modified NAA-RFs can be precisely tuned across the UV-visible-NIR spectrum to enhance the photon-to-electron conversion of TiO: by 'slow photon effect'. We systematically investigate the effect of the anodisation parameters (i.e. anodisation period and pore widening time) on the position of the PSB of NAA-RFs as well as the photocatalytic performances displayed by these photonic crystal structures. When the edges of the PSB of surface-modified NAA-RFs are positioned closely to the absorption peak of the model organic dye (i.e. methyl orange - MO), the photocatalytic performance of the system to degrade these molecules is enhanced under simulated solar light irradiation due to slow photon effect. Our investigation also reveals that the photocatalytic activity of surface-modified NAA-RFs is independent of slow photon effect and enhances with increasing period length (i.e. increasing anodisation period) of the photonic structures when there is no overlap between the PSB and the absorption peak of MO. This study therefore provides a rationale towards the photocatalytic enhancement of photonic crystals by a rational design of the PSB, creating new opportunities for the future development of high-performance photocatalysts.
机译：本文中，我们通过结合纳米多孔阳极氧化铝-皱纹滤光片（NAA-RFs）和二氧化钛（TiCh）的光敏层，报道了合理设计的复合光催化剂材料的开发。通过正弦脉冲阳极氧化合成NAA-RFs，然后用TiO功能化：通过溶胶-凝胶法提供具有光催化特性的光子结构。我们证明，经表面修饰的NAA-RF的特征性光子阻带（PSB）可以在UV-visible-NIR光谱上精确调整，以增强TiO的光子-电子转换：通过“慢光子效应”。我们系统地研究了阳极氧化参数（即阳极氧化周期和扩孔时间）对NAA-RFs PSB位置以及这些光子晶体结构显示的光催化性能的影响。当表面修饰的NAA-RF的PSB边缘紧靠模型有机染料（即甲基橙-MO）的吸收峰定位时，在模拟太阳光照射下，系统降解这些分子的光催化性能会增强。由于光子效应慢。我们的研究还表明，当PSB与Pb的吸收峰不重叠时，表面修饰的NAA-RF的光催化活性与慢速光子效应无关，并且随着光子结构的周期长度（即阳极氧化周期）的增加而增强。莫因此，本研究通过合理设计PSB为光子晶体的光催化增强提供了理论依据，为高性能光催化剂的未来发展创造了新的机遇。

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  • 来源
    《Nanophotonics Australasia 2017》|2017年|1045658.1-1045658.9|共9页
  • 会议地点 Melbourne(AU)
  • 作者

    Siew Yee Lim; Cheryl Suwen Law; Abel Santos;

  • 作者单位

    School of Chemical Engineering, The University of Adelaide, Australia,Institute for Photonics and Advanced Sensing (IP AS), The University of Adelaide, Australia,ARC Centre of Excellence for Nanoscale Biophotonics (CNBP), The University of Adelaide, Australia;

    School of Chemical Engineering, The University of Adelaide, Australia,Institute for Photonics and Advanced Sensing (IP AS), The University of Adelaide, Australia,ARC Centre of Excellence for Nanoscale Biophotonics (CNBP), The University of Adelaide, Australia;

    School of Chemical Engineering, The University of Adelaide, Australia,Institute for Photonics and Advanced Sensing (IP AS), The University of Adelaide, Australia,ARC Centre of Excellence for Nanoscale Biophotonics (CNBP), The University of Adelaide, Australia;

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  • 正文语种 eng
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  • 关键词

    Photocatalysis; nanoporous anodic alumina; photonic stopband; photonic crystal; anodisation; solar light; photolysis;

    机译：光催化；纳米多孔阳极氧化铝；光子阻带光子晶体阳极氧化；太阳能灯光解作用;

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