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Morphological examination of undoped stannic oxide and platinum-doped stannic oxide for gas sensing in air

Ibrahim, Zuhairi and Othaman, Zulkafli and Abd Karim, Mohd Mustamam (2003) Morphological examination of undoped stannic oxide and platinum-doped stannic oxide for gas sensing in air. Journal of The Institute of Materials Malaysia, 4 (2). pp. 107-116.

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Abstract

Samples of pure stannic oxide and platinum-doped stannic oxide prepared by dry pressing at a pressure of 50 MPa and sintered at a temperature of 1000 °C for an hour, at heating rate of 20 °C per minute, served as an active element in a gas sensor. Scanning Electron Microscopy (SEM) micrographs showed that samples have polycrystalline structures with grain sizes of the order of less than 1 μm. The sintering of the undoped stannic oxide at 400 °C and 1000 °C showed the microstructure changes from a non-uniform agglomeration to grain coarsening without densification. This was shown as rough surface with protrusions. For samples of platinum-doped stannic oxide, the grain sizes increased as the dopant level was increased from 0.5 wt% to 2 wt% Pt in SnO2. The porous morphology observed is evident of a high concentration of oxygen vacancies. The rough areas are favoured limited adsorption sites for oxygen in ambient air. These features are desirable for the enhancement of gas sensitivity of the samples for methane or carbon monoxide sensing in air.

Item Type:Article
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:6767
Deposited By: Assoc Prof Dr Zulkafli Othaman
Deposited On:10 Nov 2008 03:01
Last Modified:10 Nov 2008 03:01

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