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Vol. 97, Issue 10, October 2008, pp.74-79





Humidity Sensor Studies on Dy1-xSrxCrO3 (0 x 0.1) Synthesized by Microwave Assisted Combustion Method



aCentre for Advanced Studies in Botany, University of Madras, Chennai 600 025,

Tamil Nadu, India

*Department of Chemistry, Nehru Memorial College, Puthanampatti 621 007,

Tiruchirappalli, Tamil Nadu, India

Tel : +914327234227, fax: +914327234811

E-mail: sundaramr2007@gmail.com



Received: 8 September 2008   /Accepted: 22 October 2008   /Published: 31 October 2008


Abstract: The perovskite oxides, Dy1-xSrxCrO3 (0x0.1) were synthesized by a novel microwave assisted combustion route and characterized by X-ray diffraction. X-ray pattern of Dy0.9Sr0.1CrO3 showed the presence of small amounts of SrCrO4 impurity. The perovskite oxides were tested as candidate materials for humidity sensing by measuring the variation in their DC resistance as a function of relative humidity in the range of 5-98 % at 25oC under static conditions. The sensitivity factor, Sf (R5%/R98%) for DyCrO3, Dy0.95Sr0.05CrO3 and Dy0.90Sr0.10CrO3 were calculated to be 218, 3609 and 6364 respectively. The response and recovery characteristics were studied for Dy0.90Sr0.10CrO3, which exhibited good linearity in log R vs. RH plots and narrow hysteresis loop in adsorption-desorption investigations.


Keywords: DyCrO3, SrCrO3, Electrical properties, Humidity sensor


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