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Electronic structure of TiO2 nanotube arrays from X-ray absorption near edge structure studies
Zhou, J. G.2; Fang, H. T.3; Maley, J. M.4; Murphy, M. W.1; Ko, J. Y. Peter1; Cutler, J. N.2; Sammynaiken, R.4; Sham, T. K.1; Liu, M.5; Li, F.5
Corresponding AuthorSham, T. K.(tsham@uwo.ca)
2009
Source PublicationJOURNAL OF MATERIALS CHEMISTRY
ISSN0959-9428
Volume19Issue:37Pages:6804-6809
AbstractWe report an X-ray absorption near edge structure (XANES) investigation of several TiO2 nanotube arrays, including the as-prepared nanotube arrays from electrochemical anodic oxidation of Ti foil (as-prepared ATNTA), as-prepared nanotube arrays after annealing at 580 degrees C (annealed ATNTA) and annealed ATNTA after electrochemical intercalation with Li (Li-intercalated ATNTA). XANES at the O K-edge and Ti L-3,L-2 and K edges shows distinctly different spectral features for the as-prepared and the annealed ATNTA, characteristic of amorphous and anatase structures, respectively. Intercalation of Li into annealed ATNTA induces a surprising, yet spectroscopically unmistakable, anatase to rutile transition. XANES at the Li K-edge clearly shows ionic features of Li in ATNTA. The charge relocation from Ti 3d to O 2p at the conduction band in TiO2 was also observed when Li ions were intercalated into annealed ATNTA albeit no noticeable reduction of Ti4+ to Ti3+ was observed. The O K-edge shows a distinctly enhanced feature in the multiple scattering regime, indicating a close to linear O-Li-O arrangement in Li-intercalated ATNTA. These results show bonding changes between Ti and O resulting from the interaction of Li ions in the TiO2 lattices. Such bonding variation has also been supported by X-ray excited optical luminescence (XEOL), which suggests Li+-defect interactions. The implications of these results are discussed.
Funding OrganizationNSERC ; CFI ; OIT ; CRC (TKS) ; National Science Foundation of China ; Centre for Chemical Physics at UWO
DOI10.1039/b909225k
Indexed BySCI
Language英语
Funding ProjectNSERC ; CFI ; OIT ; CRC (TKS) ; National Science Foundation of China[5060211] ; National Science Foundation of China[50872026] ; Centre for Chemical Physics at UWO
WOS Research AreaChemistry ; Materials Science
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary
WOS IDWOS:000269835600020
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:58[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/97222
Collection中国科学院金属研究所
Corresponding AuthorSham, T. K.
Affiliation1.Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada
2.Univ Saskatchewan, Canadian Light Source Inc, Saskatoon, SK S7N 0X4, Canada
3.Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
4.Univ Saskatchewan, Saskatchewan Struct Sci Ctr, Saskatoon, SK S7N 0X4, Canada
5.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China
Recommended Citation
GB/T 7714
Zhou, J. G.,Fang, H. T.,Maley, J. M.,et al. Electronic structure of TiO2 nanotube arrays from X-ray absorption near edge structure studies[J]. JOURNAL OF MATERIALS CHEMISTRY,2009,19(37):6804-6809.
APA Zhou, J. G..,Fang, H. T..,Maley, J. M..,Murphy, M. W..,Ko, J. Y. Peter.,...&Li, F..(2009).Electronic structure of TiO2 nanotube arrays from X-ray absorption near edge structure studies.JOURNAL OF MATERIALS CHEMISTRY,19(37),6804-6809.
MLA Zhou, J. G.,et al."Electronic structure of TiO2 nanotube arrays from X-ray absorption near edge structure studies".JOURNAL OF MATERIALS CHEMISTRY 19.37(2009):6804-6809.
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