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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
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
2014-06-19
DOI10.1021/jp502912u
Volume118Issue:24Pages:12661-12668
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS KeywordINFRARED-ABSORPTION SPECTROSCOPY ; PHOTOCATALYTIC ACTIVITY ; TITANIUM-DIOXIDE ; BAND ALIGNMENT ; PHOTOGENERATED ELECTRONS ; NANOCRYSTALLINE TIO2 ; PT/TIO2 ; SURFACE ; TRANSFORMATION ; MECHANISMS
AbstractIt 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.
Language英语
WOS IDWOS:000337783900010
Citation statistics
Cited Times:59[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/145721
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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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