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Vol. 74, Issue 12, December 2006, pp. 855-863

 

Bullet

 

Methanol Sensing Behavior of Strontium(II) Added MgAl2O4 Composites Through Solid-State Electrical Conductivity Measurements

 

J. JUDITH VIJAYA1, L. JOHN KENNEDY2, G. SEKARAN2, K.S. NAGARAJA*1

1Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College,

Chennai- 600 034, India

2Department of Environmental Technology, Central Leather Research Institute (CLRI),

Chennai 600 020, India

*Corresponding author: Tel: +91-44-28178200, fax: +91-44-28175566

E-mail: ksnagi@vsnl.net, jjvijayaloyola@yahoo.co.in

 

Received: 11 December 2006   /Accepted: 26 December 2006   /Published: 29 December 2006

 

 

Abstract: Strontium(II) added MgAl2O4 composites prepared by sol gel technique was utilized for the detection of methanol vapors. XRD, SEM and BET surface area measurements were employed to identify the structural phases and surface morphology. The composites were prepared with the molar ratios of Mg: Sr as (1.0: 0.0, 0.8:0.2, 0.6:0.4, 0.4:0.6, 0.2:0.8, 0.0:1.0) keeping the aluminium molar ratio as constant for all the compositions and were labeled as MgSA1, MgSA2, MgSA3, MgSA4, MgSA5 and MgSA6 respectively. The samples sintered at 900oC for 5 h were subjected to dc resistance measurements in the temperature range of 30-200oC to study the methanol vapor detection characteristics. The results revealed that the sensitivity in detecting methanol vapor increased with increase in temperature up to 150 oC and thereafter decreased. The sensitivity increased with methanol concentration from 100-5000 ppm at 150oC. Among the different compositions of the composites MgSA5 showed the best sensitivity to methanol detection at an operating temperature of 150oC.

 

Keywords: Metal oxide composites; Ceramics; Sol gel preparation; Methanol vapor; Electrical conductivity

 

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