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Nashik, India

Patil A.,Lvh College | Dighavkar C.,Lvh College | Borse R.,Msgcollege
Journal of Optoelectronics and Advanced Materials | Year: 2011

Thick films of pure and Al doped ZnO with various concentrations (1 wt. %, 3 wt. %, 5 wt. %, 7 wt. % and 10 wt. %) of Al were prepared on alumina substrates using a screen printing technique. These films were fired at a temperature of 700°C for two hours in an air atmosphere. Morphological, compositional and structural properties of the samples were studied using the scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDAX) and X-ray diffraction techniques respectively. The gas sensing studies were carried out in a static gas sensing system under normal laboratory conditions. The surface resistance of thick films changes when exposed to CO 2 gas. The Al doped films show significant sensitivity to CO 2 gas than pure ZnO film. 10 wt. % Al-doped ZnO films were found to be more sensitive to CO 2 gas exposed at 250°C than other doping concentrations with fast response and comparatively slow recovery time.


Patil A.V.,Lvh College | Dighavkar C.G.,Lvh College | Sonawane S.K.,Lvh College | Patila S.J.,Lvh College | And 3 more authors.
Journal of Optoelectronics and Advanced Materials | Year: 2010

Thick films of pure and Nb2O5 doped ZnO for various concentrations (1 wt. %, 3 wt. %, 5 wt. %, 7 wt. % and 10 wt. %) were prepared on alumina substrates using a screen printing technique. These films were fired at a temperature of 700°C 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 (EDS) and X-ray diffraction techniques respectively. The Ethanol gas sensing studies were carried out in a static gas sensing system under normal laboratory conditions. The surface resistance of thick films decreases when exposed to ethanol gas. The Nb2O5 doped films show significant sensitivity to Ethanol gas than pure ZnO film. 3 wt. % Nb2O5-doped ZnO film was found to be more sensitive (84%) to ethanol gas exposed at 300oC than other doping concentrations with fast response and recovery time.

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