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Vol. 92, Issue 5, May 2008, pp. 99-107




Synthesis of Antimony Doped Tin Oxide and its Use as Electrical Humidity Sensor


B. C. Yadav*, Preeti Sharma, Amit. K. Srivastava and A. K. Yadav

Nanomaterials & Sensors Research Laboratory,

Department of Physics,

 Lucknow University, Lucknow- 226007, India

*E-mail: balchandra_yadav@rediffmail.com



Received: 30 March 2008   /Accepted: 20 May 2008   /Published: 26 May 2008


Abstract: In this paper we report the humidity sensitive electrical properties of antimony doped tin oxide. Antimony has been doped within SnO2 in the ratio 1:1. The pellet has been made by hydraulic pressing machine at pressure 30 MPa and room temperature 24°C. This pellet, has been annealed at 200șC, 300șC, 400șC, 500șC and 600șC successively for 3 hrs and after each step annealing, observations were taken. It has been observed, as Relative Humidity (%RH) increases, there is decrease in the resistivity of pellet for the entire range of RH i.e. from 10% to 95%. Linear decrease is observed for the range of RH from 10% to 85% for annealing temperature 200șC and 300șC, from 10% to 60% for annealing temperature 400șC and from 10% to 30% for annealing temperature 500șC and 600șC respectively. Scanning electron micrographs show the surface morphology and X-ray diffraction reveals the nanostructure of sensing element. Results have been found reproducible with hysterisis of ± 2% after 3 months.


Keywords: Humidity sensors, Nanostructure, Morphology, Resistivity


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