Journal of Scientific Research
Volume 2, Numéro 3, Pages 13-18
2012-06-01
Environmental Gas Pollutant Detection By Using Metal Oxides Doping Of Titanate Thick Films
Authors : Dighavkar Chandrakant . Patil Arun . Dighavkar Pratap . Dighavkar Asmita .
Abstract
Thick films of pure TiO2 and various concentrations (1 wt. %, 3 wt. %, 5 wt. %, 7 wt. % and 10 wt. %) of Cr2O3 and Nb2O5 doped TiO2 were prepared on alumina substrates using a screen printing technique. The doped films were fired at a temperature of 800ºC for two hours in an air atmosphere. Morphological, compositional and structural properties of the samples were obtained using the scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDAX) and X-ray diffraction (XRD) techniques respectively. Various oxidizing and reducing gases were tested for these metal oxides doped films. Among these NH3 and H2S gas sensing properties for these thick films were investigated for Cr2O3 and Nb2O5 doped TiO2 respectively at different operating temperatures. Pure TiO2 was observed to be insensitive to these gases. At 250oC, the 5 wt. % Cr2O3 doped films have shown significant sensitivity (88.23 %) to NH3 gas whereas 1 wt. % Nb2O5 doped films have shown highest sensitivity (98.78 %) to H2S gas at 200oC than any other doped films with fast response and recovery time.
Keywords
TiO2; Cr2O3; Nb2O5; thick films; NH3; H2S.
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