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Title: Gas selectivity of nanostructured ZnSb 2O 6 synthesized by a colloidal method
Author: Michel, C.R.
Lopez Contreras, N.L.
Lopez-Alvarez, M.A.
Martinez-Preciado, A.H.
Issue Date: 2012
Abstract: ZnSb 2O 6 with trirutile-type structure was prepared by a microwave-assisted colloidal method. Stoichiometric amounts of zinc nitrate, antimony trichloride and n-dodecylamine, dissolved in ethyl alcohol, were used in the synthesis. The thermal decomposition of the precursor produced single-phase ZnSb 2O 6 at 500 �C. The formation of a large number of micro and nanowires, with particles attached to their surface, was observed by SEM and TEM. The size of the attached particles was in the range 50 nm to 1.2 ?m; whereas the length of the wires was between 80 ?m and 120 ?m. The nanostructures of ZnSb 2O 6 obtained in this work were not previously reported. The use of other surfactants may provide simple ways to obtain different micro and nanostructures of this oxide. The CO, O 2 and CO 2 gas sensing properties of ZnSb 2O 6 thick films were evaluated in alternate current, measuring the magnitude of the impedance (Z). Different operating temperatures and applied frequencies were tested, however, a reproducible detection of the gases was registered at 400 �C and 100 kHz. Gas selectivity was also a relevant characteristic of this material. Besides, the response to these gases confirmed that ZnSb 2O 6 is an n-type semiconductor. The films detected variations in the concentration of the gases. In excess O 2 and CO, a non-linear behavior was registered; whereas in CO 2, a quasi-linear trend was observed. � 2012 Elsevier B.V. All rights reserved.
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