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Enhanced Response of Pd Nanoparticle–Loaded {\rm SnO}_{2} Thin Film Sensor for {\rm H}_{2} Gas

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2 Author(s)
Verma, M.K. ; Department of Physics and Astrophysics, University of Delhi, New Delhi, India ; Gupta, V.

The sensing response of {\rm SnO}_{2} thin film sensors loaded with Pd nanoparticles ({\rm Pd}\hbox {-}{\rm SnO}_{2}) is studied for {\rm H}_{2} gas. Nanoparticles of Pd catalyst of varying size (2–6 nm) are synthesized using chemical route with different concentrations of polyvinyl pyrollidone (PVP) as a stabilizing agent and dispersed over the surface of {\rm SnO}_{2} thin film deposited by rf magnetron sputtering technique. The sensing response of all prepared sensors was recorded over a temperature range of 50 ^{\circ}{\rm C} –200 ^{\circ}{\rm C} . The effect of PVP used for synthesis of Pd nanoparticles has been studied on the sensing response characteristics of {\rm Pd}\hbox {-}{\rm SnO}_{2} sensors. The optimized sensor structure was found to exhibit a higher response (1.9\times 10^{3}) at a relatively low operating temperature (150 ^{\circ}{\rm C} ) with fast response time ({\rm t}_{90}\sim 2~{\rm s}) for 500 ppm {\rm H}_{2} gas. The origin of enhanced sensing response is identified in the light of the interaction of PVP with Pd nanoparticles besides the spill over of {\rm H}_{2} gas molecules on the uncovered surface of {\rm SnO}_{2} thin film.

Published in:

Sensors Journal, IEEE  (Volume:12 ,  Issue: 10 )