Vol. 85, Issue 11, November 2007, pp.1728-1738

Detection of Hydrogen Sulphide Gas Sensor Based Nanostructured Ba₂CrMoO₆ Thick Films

A. V. Kadu, N. N. Gedam and G. N. Chaudhari
Nano Technology Research Laboratory, Department of Chemistry
Shri Shivaji Science College
Amravati- 444602, M.S., India

Received: 2 April 2007  /Accepted: 20 November 2007  /Published: 26 November 2007

Abstract: Nanocrystalline pure and doped Ba₂CrMoO_6, having an average crystallite size of 40 nm were synthesized by the sol-gel citrate method. Structural and gas-sensing characteristics were performed by using X-ray diffraction (XRD) and sensitivity measurements. The gas sensing properties to reducing gases like Hydrogen sulphide (H₂S), liquefied petroleum gas (LPG), carbon monoxide (CO) and hydrogen gas (H₂) were also discussed. The maximum sensitivity was obtained for 5 wt % Ni doped Ba₂CrMoO₆ at an operating temperature 250^oC for H₂S gas. Pd incorporation over 5 wt% Ni doped Ba₂CrMoO₆ improved the sensitivity, selectivity, response time, and reduced the operating temperature from 250 to 200^oC of the sensor for H₂S gas. This sensor also shows good satiability.

Keywords: Nanoparticles, Ba₂CrMoO₆, Sensitivity, Selectivity, Hydrogen sulphide gas sensor

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