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Instantaneous photoinitiated synthesis and rapid pulsed photothermal treatment of three-dimensional nanostructured TiO_2 thin films through pulsed light irradiation

机译:三维纳米TiO_2薄膜的脉冲光瞬时光引发合成及快速脉冲光热处理

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摘要

We report a novel approach to the instantaneous photoinitiated synthesis of mixed anatase-rutile nanocrystalline TiO_2 thin films with a three-dimensional nanostructure through pulsed white light irradiation of photosensitive Ti-organic precursor films. Pulsed photoinitiated pyrolysis accompanied by instantaneous self-assembly and crystallization occurred to form graphitic oxides-coated TiO_2 nanograms. Subsequent pulsed light irradiation working as in situ pulsed photothermal treatment improved the crystalline quality of TiO_2 film despite its low attenuation of light. The non-radiative recombination of photogenerated electrons and holes in TiO_2 nanograins, coupled with inefficient heat dissipation due to low thermal conductivity, produces enough heat to provide the thermodynamic driving force for improving the crystalline quality. The graphitic oxides were reduced by pulsed photothermal treatment and can be completely removed by oxygen plasma cleaning. This photoinitiated nanofabrication technology opens a promising way for the low-cost and high-throughput manufacturing of nanostructured metal oxides as well as TiO_2 nanocrystalline thin films.
机译:我们报告了一种新型的方法,通过光敏的Ti-有机前体薄膜的脉冲白光辐照,合成了具有三维纳米结构的混合锐钛矿-金红石型纳米晶TiO_2薄膜。脉冲光引发的热解伴随瞬时的自组装和结晶发生,以形成石墨氧化物涂层的TiO_2纳克。随后的脉冲光辐照作为原位脉冲光热处理,尽管光衰减低,但仍提高了TiO_2薄膜的晶体质量。 TiO_2纳米颗粒中光生电子和空穴的非辐射复合,以及由于低热导率而导致的低效率散热,产生了足够的热量,可提供热力学驱动力来改善晶体质量。通过脉冲光热处理可以还原石墨氧化物,并且可以通过氧等离子体清洗将其完全去除。这种光引发的纳米加工技术为纳米结构金属氧化物以及TiO_2纳米晶体薄膜的低成本,高通量生产开辟了一条有希望的途径。

著录项

  • 来源
    《Journal of Materials Research》 |2017年第9期|1701-1709|共9页
  • 作者单位

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People 's Republic of China;

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

    NovaCentrix, Austin, Texas 78728, USA;

    Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, Louisiana 70118, USA;

    Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, Louisiana 70118, USA;

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

    Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA;

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

    Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, Louisiana 70118, USA;

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People's Republic of China;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People's Republic of China;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People's Republic of China;

    NovaCentrix, Austin, Texas 78728, USA;

    Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA;

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