Electronic structure studies of Fe-doped ZnO nanorods by x-ray absorption fine structure

Title
Electronic structure studies of Fe-doped ZnO nanorods by x-ray absorption fine structure
Authors
Sanjeev GautamShalendra KumarP. Thakur채근화Ravi KumarB. H. KooC. G. Lee
Keywords
Electronic structure; ZnO nanorods; x-ray absorption fine structure
Issue Date
2009-09
Publisher
Journal of physics D, applied physics
Citation
VOL 42, NO 17, 175406-1-175406-7
Abstract
We report the electronic structure studies of well-characterized polycrystalline Zn1−xFexO (x = 0.0, 0.01, 0.03 and 0.05) nanorods synthesized by a co-precipitation method using x-ray absorption fine structure (XAFS). X-ray diffraction (XRD) reveals that Fe-doped ZnO crystallizes in a single phase wurtzite structure without any secondary phase. From the XRD pattern, it is observed that peak positions shift towards lower 2θ value with Fe doping. The change in the peak positions with increase in Fe contents clearly indicates that Fe ions replace Zn ions in the ZnO matrix. Linear combination fittings at Fe K-edge demonstrate that Fe is in a mixed-valent state (Fe3+/Fe2+) with a ratio of ∼7 : 3 (Fe3+ : Fe2+). XAFS data are successfully fitted to wurtzite structure using IFEFFIT and Artemis. The results indicate that Fe substitutes Zn site in the ZnO matrix in tetrahedral symmetry.
URI
http://pubs.kist.re.kr/handle/201004/35673
ISSN
0022-3727
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