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.
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Posté Le : 21/04/2022
Posté par : einstein
Ecrit par : - Dighavkar Chandrakant - Patil Arun - Dighavkar Pratap - Dighavkar Asmita
Source : Journal of Scientific Research Volume 2, Numéro 3, Pages 13-18 2012-06-01