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题名: Transfer of Photoinduced Electrons in Anatase-Rutile TiO2 Determined by Time-Resolved Mid-Infrared Spectroscopy
作者: Shen, Shuai1, 2;  Wang, Xiuli1;  Chen, Tao1;  Feng, Zhaochi1;  Li, Can1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2014-06-19
DOI: 10.1021/jp502912u
卷: 118, 期:24, 页:12661-12668
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: It has been a long-standing debate about the photogenerated charge transfer in anatase-rutile mixed phase TiO2. In this work, we investigated this issue by studying anatase, rutile, and anatase-rutile mixed phase TiO2 with time-resolved mid-IR (MIR) spectroscopy (TR-MIR) in a vacuum or methanol vapor. Anatase TiO2 shows transient MIR absorption on microsecond time scale after 355 nm excitation, which is attributed to photoinduced electrons in the shallow states of anatase. Conversely, there is no transient MIR absorption detected for rutile TiO2. For anatase rutile mixed phase TiO2, the initial MIR absorption intensity decreases relative to that calculated from its phase composition, indicating that electron transfer takes place in the anatase-rutile phase junction of mixed phase TiO2. Our results suggest that the photogenerated electrons in the shallow states of anatase transfer to rutile across the anatase rutile interface, but this does not exclude the possibility that the net electron transfer from rutile to anatase due to the complicated energy levels and kinds of trapped states in mixed phase TiO2.
关键词[WOS]: INFRARED-ABSORPTION SPECTROSCOPY ;  PHOTOCATALYTIC ACTIVITY ;  TITANIUM-DIOXIDE ;  BAND ALIGNMENT ;  PHOTOGENERATED ELECTRONS ;  NANOCRYSTALLINE TIO2 ;  PT/TIO2 ;  SURFACE ;  TRANSFORMATION ;  MECHANISMS
语种: 英语
WOS记录号: WOS:000337783900010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145721
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Shen, Shuai,Wang, Xiuli,Chen, Tao,et al. Transfer of Photoinduced Electrons in Anatase-Rutile TiO2 Determined by Time-Resolved Mid-Infrared Spectroscopy[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2014,118(24):12661-12668.
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