Author(s)

Ashish V. Kadu, Archana B. Bodade, Anjali B. Bodade, G. N. Chaudhari

Nano Technology Research Laboratory, Department of Chemistry, Shri Shivaji Science College, Amravati, India.
Prof. Ram Meghe College of Engineering and Management, Amravati, India.

The nanocrystalline of La_1-xSr_xCrO₃ (x = 0.0, 0.1, 0.2, 0.3 & 0.4) were prepared by sol-gel method and their crystal structures & morphology were characterized by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). XRD patterns indicate that the average particle size of the nanocrystalline La_0.7Sr_0.3CrO₃in the range of 30 - 35 nm. The gas sensing properties were studied towards reducing gases like Ammonia gas (NH3), liquefied petroleum gas (LPG), hydrogen sulphide (H₂S) and H₂ gas and it is observed that undoped LaCrO₃ shows response to H₂S gas at relatively high operating temperature 300°C. The La_1-xSr_xCrO₃ based sensor with x = 0.3 shows better sensitivity towards H₂S gas at an operating temperature 210°C. The effect of Sr doping on sensitivity, response time and recovery time of the sensor in the presence of H₂S and other reducing gases were studied and discussed.

La_1-xSr_xCrO₃; H₂S Gas; Selectivity; Response & Recovery Time

A. V. Kadu, A. B. Bodade, A. B. Bodade and G. Chaudhari, "Structural Characterization of Nanocrystalline La_1-xSr_xCrO₃ Thick Films for H₂S Gas Sensors," Journal of Sensor Technology, Vol. 2 No. 1, 2012, pp. 13-18. doi: 10.4236/jst.2012.21003.