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Transfer of Photoinduced Electrons in Anatase-Rutile TiO2 Determined by Time-Resolved Mid-Infrared Spectroscopy
Shen, Shuai1,2; Wang, Xiuli1; Chen, Tao1; Feng, Zhaochi1; Li, Can1
刊名JOURNAL OF PHYSICAL CHEMISTRY C
2014-06-19
DOI10.1021/jp502912u
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
关键词[WOS]INFRARED-ABSORPTION SPECTROSCOPY ; PHOTOCATALYTIC ACTIVITY ; TITANIUM-DIOXIDE ; BAND ALIGNMENT ; PHOTOGENERATED ELECTRONS ; NANOCRYSTALLINE TIO2 ; PT/TIO2 ; SURFACE ; TRANSFORMATION ; MECHANISMS
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.
语种英语
WOS记录号WOS:000337783900010
引用统计
被引频次:53[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/145721
专题中国科学院大连化学物理研究所
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
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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.
APA Shen, Shuai,Wang, Xiuli,Chen, Tao,Feng, Zhaochi,&Li, Can.(2014).Transfer of Photoinduced Electrons in Anatase-Rutile TiO2 Determined by Time-Resolved Mid-Infrared Spectroscopy.JOURNAL OF PHYSICAL CHEMISTRY C,118(24),12661-12668.
MLA Shen, Shuai,et al."Transfer of Photoinduced Electrons in Anatase-Rutile TiO2 Determined by Time-Resolved Mid-Infrared Spectroscopy".JOURNAL OF PHYSICAL CHEMISTRY C 118.24(2014):12661-12668.
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