Chadwick, A.V. and Russell, N.V. and Whitham, A.R. and Wilson, A. (1994) Nanocrystalline Metal-Oxide Gas Sensors. In: Eurosensors VII, Budapest, Hungary.
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Samples of nanocrystalline ZnO have been prepared and X-ray absorption spectra (EXAFS) have been recorded at the Zn K-edge. Comparison with bulk ZnO shows that the amplitude of the EXAFS is dramatically reduced compared to the bulk polycrystalline sample and this has been attributed to a large fraction of the atoms being situated in grain boundary regions. Quantitative analysis of the data suggests that a model in which coordination numbers, radial distances and Debye-Waller factors were allowed to vary produced the best fit to the data. The nanocrystalline particles were found to be asymmetrical, approximately 50 angstrom in the 100 direction and 30 angstrom in the 002 direction, and the Zn-Zn coordination was reduced from 12 to around 8. Initial gas sensing results show an encouraging response to low ppm concentrations of toluene vapour.
|Item Type:||Conference or workshop item (Other)|
|Subjects:||Q Science > QD Chemistry|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts|
|Depositing User:||P. Ogbuji|
|Date Deposited:||03 Jul 2009 17:19|
|Last Modified:||20 Apr 2012 15:07|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/20434 (The current URI for this page, for reference purposes)|
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