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Vol. 104, Issue 5, April 2009, pp.76-86





Effect of Yttria on Gas Sensitivity of Tungsten Trioxide


bAbdul Halim SHAARI, aNorhisam MISRON, cNorhafizah ABDULLAH

aElectrical and Electronic Department, Engineering Faculty

bDepartment of Physics, Science Faculty

 cDepartment of Chemical and Environmental of Engineering Faculty

Universiti Putra Malaysia 43400, Serdang, Selangor, Malaysia

Tel: +603-89466309, fax: +603-88466327

E-mail: mhshahrokh@gmail.com



Received: 11 March 2009   /Accepted: 19 May 2009   /Published: 25 May 2009


Abstract: The influence of 5, 10, and 15 wt % of yttrium oxide on gas sensitivity of tungsten oxide was studied. The prepared powders were mixed with a binder and printed onto the electrode surface using thick-film screen printing. Microstructure, electrical conductivity, and gas sensitivity of films were dependant on the ratio of doped yttria, and thickness of the film. Increasing the ratio of yttria beyond 10 wt % causes a deficient electrical conductivity and very low sensitivity of the films when they exposed to the organic solvent. Higher sensitivity to the solvents was observed at 10 wt % of doping in both thickness of 7 and 15 m. Selectivity, response time, and thermal dependency of responses to the solvents were compared with a commercial alcohol sensor.


Keywords: Gas sensor, Thick film, Nano powder, Tungsten trioxide, Yttrium oxide


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