Investigation on Initial Process of Photoexcitation at Semiconductor/Solution Interface by Ultrafast Spectroscopy

超快光谱研究半导体/溶液界面光激发初始过程

基本信息

  • 批准号:
    10440202
  • 负责人:
  • 金额:
    $ 5.95万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
  • 财政年份:
    1998
  • 资助国家:
    日本
  • 起止时间:
    1998 至 2000
  • 项目状态:
    已结题

项目摘要

This study aimed at clarification of decisive factor of recombination between photoexcited electron and positive hole in the semiconducting materials by analysis of initial process in the photoirradiated titania particles and electrodes with pump-probe time-resolved diffuse reflectance spectroscopy. By using ultrafast femtosecond laser system with 310 nm pump (excitation) and 620 nm probe pulses, we have proved that the bandgap excitation of titania particles induces very fast rise followed by relatively rapid and slow decay of absorption. The rapid decay obeyed second order kinetics suggesting that the absorption is due to trapped electrons and their recombination with positive holes give the rapid decay. Similar behavior was also observed in the electrode of polycrystalline titania showing that each titania particle in the electrode behaves independently. Dependence of these decays on the pump pulse wavelength was investigated for anatase and rutile titania particles. It was clarified that when the particles were photoexcited by the pump pulse of energy close to the bandgaps of crystallites very fast decay component appeared. We concluded that this is due to the formation of excitons.
本研究旨在通过泵浦-探测时间分辨漫反射光谱分析光辐照二氧化钛粒子和电极的初始过程,阐明半导体材料中光激发电子与正空穴复合的决定因素。利用310 nm泵浦和620 nm探测脉冲的超快飞秒激光系统,我们证明了二氧化钛粒子的带隙激发引起了吸收的快速上升和相对较快和较慢的衰减。快速衰变服从二级动力学,表明吸收是由捕获的电子引起的,它们与正空穴的复合给出了快速衰变。在多晶二氧化钛的电极上也观察到了类似的行为,表明电极中的每个二氧化钛颗粒都是独立的。对于锐钛矿型和金红石型二氧化钛颗粒,研究了这些衰减率与泵浦脉冲波长的关系。结果表明,在晶体禁带附近的能量泵浦脉冲作用下,粒子出现了非常快的衰变成分。我们的结论是,这是由于激子的形成。

项目成果

期刊论文数量(46)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
B.Ohtani: "Femtosecond Diffuse Reflectance Spectroscopy of Aqueous Titanium(IV) Oxide Suspension:Correlation of Electron-Hole Recombination Kinetics with Photocatalytic Activity" Chem.Lett.579-580 (1998)
B.Ohtani:“水性钛(IV)氧化物悬浮液的飞秒漫反射光谱:电子-空穴复合动力学与光催化活性的相关性”Chem.Lett.579-580(1998)
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H.Kominami et al.: "Immobilization of Highly Active Titanium (IV) Oxide Particles.A Novel Strategy of Preparation of Transparent Photocatalytic Coatings"Appl.Cat al.B.Environ.. 30. 329-335 (2001)
H.Kominami 等人:“高活性钛 (IV) 氧化物颗粒的固定化。透明光催化涂层制备的新策略”Appl.Cat al.B.Environ.. 30. 329-335 (2001)
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H.Kominami, et al.: "Titanium(IV) Oxide Photocatalyst of Ultra-high Activity : a New Preparation Process Allowing Compatibility of High Adsorptivity and Low Electron-Hole Recombination Probability"Cat al.Lett. 56. 125-129 (1998)
H.Kominami等人:“超高活性钛(IV)氧化物光催化剂:一种兼具高吸附性和低电子空穴复合概率的新制备工艺”Cat al.Lett。
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Kominami, H., Kato, J.-i., Murakami, S.-y., Kera, Y., Inoue, M., Inui, T.and Ohtani, B.: "Synthesis of Titanium (IV) Oxide of Ultra-high Photocatalytic Activity : High-temperature Hydrolysis of Titanium Alkoxides with Water Liberated Homogeneously from So
Kominami, H.、Kato, J.-i.、Murakami, S.-y.、Kera, Y.、Inoue, M.、Inui, T. 和 Ohtani, B.:“钛 (IV) 氧化物的合成
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    0
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Kominami, H., Kumamoto, H., Kera, Y.and Ohtani, B.: "Immobilization of Highly Active Titanium (IV) Oxide Particles. A Novel Strategy of Preparation of Transparent Photocatalytic Coatings"Appl. Catal. B.Environ.. 30. 329-335 (2001)
Kominami, H.、Kumamoto, H.、Kera, Y. 和 Ohtani, B.:“高活性钛 (IV) 氧化物颗粒的固定化。透明光催化涂层制备的新策略”
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OHTANI Bunsho其他文献

Development of a Precise Method for Light-intensity Dependence of Photocatalytic Reaction Rates
开发光催化反应速率的光强度依赖性精确方法
  • DOI:
  • 发表时间:
    2020
  • 期刊:
  • 影响因子:
    0
  • 作者:
    KETWONG Pradudnet;ZHU Xuezhi;TAKASHIMA Mai;OHTANI Bunsho
  • 通讯作者:
    OHTANI Bunsho

OHTANI Bunsho的其他文献

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{{ truncateString('OHTANI Bunsho', 18)}}的其他基金

Development of Diamond-shaped Particle Assemblies Using Magnetic Interaction
利用磁相互作用开发菱形颗粒组件
  • 批准号:
    24655185
  • 财政年份:
    2012
  • 资助金额:
    $ 5.95万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Development of The Third-generation Active Photocatalysts: Crystalline Shape-controlled Metal Oxide Particles
第三代活性光催化剂的开发:晶体形状控制的金属氧化物颗粒
  • 批准号:
    22245033
  • 财政年份:
    2010
  • 资助金额:
    $ 5.95万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Design and development of photocatalysts of high activity and highly efficient photocatalytic reaction systems based on the understanding of photocatalytic reaction mechanisms
基于对光催化反应机理的理解,设计和开发高活性、高效光催化反应体系的光催化剂
  • 批准号:
    17029001
  • 财政年份:
    2001
  • 资助金额:
    $ 5.95万
  • 项目类别:
    Grant-in-Aid for Scientific Research on Priority Areas
Development of Hyper Active Semiconductor Photocatalyst
高活性半导体光触媒的开发
  • 批准号:
    10555213
  • 财政年份:
    1998
  • 资助金额:
    $ 5.95万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Design and Development of Hyper Active Photocatalyst
超活性光触媒的设计与开发
  • 批准号:
    09044114
  • 财政年份:
    1997
  • 资助金额:
    $ 5.95万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Design and Preparation of Ultra Highly Active Semiconductor Photocatalyst
超高活性半导体光催化剂的设计与制备
  • 批准号:
    07805077
  • 财政年份:
    1995
  • 资助金额:
    $ 5.95万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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