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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 $(1.9times 10^{3})$ 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 )

Date of Publication:

Oct. 2012

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