Electronic structure of TiO(2) nanotube arrays from X-ray absorption near edge structure studies

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	Electronic structure of TiO(2) nanotube arrays from X-ray absorption near edge structure studies
	J. G. Zhou; H. T. Fang; J. M. Maley; M. W. Murphy; J. Y. P. Ko; J. N. Cutler; R. Sammynaiken; T. K. Sham; M. Liu; F. Li
	2009
发表期刊	Journal of Materials Chemistry
ISSN	0959-9428
卷号	19 期号:37 页码:6804-6809
摘要	We report an X-ray absorption near edge structure (XANES) investigation of several TiO(2) 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(3,2) 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 TiO(2) was also observed when Li ions were intercalated into annealed ATNTA albeit no noticeable reduction of Ti(4+) to Ti(3+) 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.
部门归属	[murphy, m. w.; ko, j. y. peter; sham, t. k.] univ western ontario, dept chem, london, on n6a 5b7, canada. [zhou, j. g.; cutler, j. n.] univ saskatchewan, canadian light source inc, saskatoon, sk s7n 0x4, canada. [fang, h. t.] harbin inst technol, sch mat sci & engn, harbin 150001, peoples r china. [maley, j. m.; sammynaiken, r.] univ saskatchewan, saskatchewan struct sci ctr, saskatoon, sk s7n 0x4, canada. [liu, m.; li, f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang, peoples r china.;sham, tk (reprint author), univ western ontario, dept chem, london, on n6a 5b7, canada;tsham@uwo.ca
关键词	Titania Nanotubes Electrochemical Properties Carbon Nanotubes Anode Material Nanowires Xanes Intercalation Nanoparticles Spectra Storage
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32620
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. G. Zhou,H. T. Fang,J. M. Maley,et al. Electronic structure of TiO(2) nanotube arrays from X-ray absorption near edge structure studies[J]. Journal of Materials Chemistry,2009,19(37):6804-6809.
APA	J. G. Zhou.,H. T. Fang.,J. M. Maley.,M. W. Murphy.,J. Y. P. Ko.,...&F. Li.(2009).Electronic structure of TiO(2) nanotube arrays from X-ray absorption near edge structure studies.Journal of Materials Chemistry,19(37),6804-6809.
MLA	J. G. Zhou,et al."Electronic structure of TiO(2) nanotube arrays from X-ray absorption near edge structure studies".Journal of Materials Chemistry 19.37(2009):6804-6809.