Carrier Recombination-Incited Substrate Vibrations After Pulsed UV-Laser Photolysis of TiO2 Thin Single-Crystal Plate and Nanoparticle Films

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	Carrier Recombination-Incited Substrate Vibrations After Pulsed UV-Laser Photolysis of TiO2 Thin Single-Crystal Plate and Nanoparticle Films
	Zhu, M ; Zhu, GB ; Weng, YX
刊名	APPLIED SPECTROSCOPY
	2013
卷号	67 期号:5 页码:506
关键词	Titanium dioxide Thin single-crystal plate Nanoparticle film Carrier recombination Fast oscillation Flexural vibration
ISSN号	0003-7028
通讯作者	Weng, YX (reprint author), Chinese Acad Sci, Inst Phys, Key Lab Softmatter Phys, Beijing 100190, Peoples R China.
中文摘要	Photo-induced carrier generation and recombination have been regarded as important steps in understanding the photocatalytic reactions on the surfaces of semiconductors such as TiO2. During the investigation of a photocatalytic water-splitting reaction on the surface of semiconductor TiO2 (ruffle) single-crystal plate and sintered-nanoparticle (anatase) films coated on a CaF2 plate, a pulsed 355 mu laser was used for band-gap excitation and a continuous-working, mid-infrared laser as the probe to trace the kinetics of the photogenerated electrons. Fast oscillations with periods of 10-50 mu s were observed. We demonstrated experimentally that these oscillations are neither from the nonlinear carrier recombination dynamics nor surface chemical reactions; instead, they are caused by the thermal-induced flexural vibrations initiated by the fast carrier recombination in the light-absorbing area. The observed oscillations can be well accounted for by thermal stress induced flexural vibrations of the substrates due to rapid charge recombination, and the observed oscillation frequencies match the flexural vibration frequencies predicted by the Kirchhoff-Love thin-plate theory. Light-interference effect caused by the beam reflecting off the surfaces of the substrate and windows, which can amplify the oscillation signals, is also discussed. Several approaches are proposed to minimize or eliminate the interference from the substrate vibration in the transient kinetic measurement when a coherent laser is used as the probe beam.
资助信息	Natural Science Foundation of China [20925313, 21090342]; National Basic Research Program of China [2009CB930700]; Chinese Academy of Sciences [KJCX2-YW-W25]
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/56805]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhu, M,Zhu, GB,Weng, YX. Carrier Recombination-Incited Substrate Vibrations After Pulsed UV-Laser Photolysis of TiO2 Thin Single-Crystal Plate and Nanoparticle Films[J]. APPLIED SPECTROSCOPY,2013,67(5):506.
APA	Zhu, M,Zhu, GB,&Weng, YX.(2013).Carrier Recombination-Incited Substrate Vibrations After Pulsed UV-Laser Photolysis of TiO2 Thin Single-Crystal Plate and Nanoparticle Films.APPLIED SPECTROSCOPY,67(5),506.
MLA	Zhu, M,et al."Carrier Recombination-Incited Substrate Vibrations After Pulsed UV-Laser Photolysis of TiO2 Thin Single-Crystal Plate and Nanoparticle Films".APPLIED SPECTROSCOPY 67.5(2013):506.