Vol. 88, Issue 2, February 2008, pp. 74-78

Sensing Behavior of Sr and Bi Doped LaCoO₃ Sensors

G. N. Chaudhary, M. J. Pawar*

Nanotechnology  Research Laboratory, Shri. Shivaji Science College, Amravati M.S., India

E-mail: mjpawar@hotmail.com

Received: 29 November 2007   /Accepted: 22 February 2008   /Published: 26 February 2008

Abstract: Nanosized LaCoO₃ (sample S₁), La_0.8Sr_0.2CoO₃ (sample S₂) and La_0.8Bi_0.2CoO₃ (sample S₃) have been synthesized by a sol-gel method using propionic acid and ethylene glycol. It was found that, at 250⁰C, sample S₁ shows higher sensitivity for 200 ppm CO gas in air than that for 200 ppm of NH₃. Sensor response for 200 ppm CO gas in air was increased even at 180⁰C when tested for sample S₂. Bi doped LaCoO₃ (sample S₃) was able to detect 200 ppm NH₃ in air at 200⁰C. For both S₂ and S₃, sensor response increases with increase in gas concentrations. The selectivity in gas sensing is proposed on the basis of earlier work and present investigation.

Keywords: LaCoO₃, La_0.8Sr_0.2CoO₃, La_0.8Bi_0.2CoO₃, Sensor material

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