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Vol. 76, Issue 2, February 2007, pp. 1008-1017

 

Bullet

 

Synthesis, Characterization and Acetone Sensing Properties of Novel Strontium(II)-added ZnAl2O4 Composites

 

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: 17 January 2007 / Accepted: 22 February 2007 / Published: 26 February 2007

 

Abstract: Strontium(II)-added ZnAl2O4 composites prepared by sol-gel technique were tested for the detection of acetone vapors. XRD, SEM and BET surface area measurements were employed to identify the structural phases and surface morphology of the composites. The composites were prepared with the molar ratios of Zn: 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 ZnSA1, ZnSA2, ZnSA3, ZnSA4, ZnSA5 and ZnSA6 respectively. The samples sintered at 900oC for 5 h were subjected to dc resistance measurements from room temperature to 200oC to study the acetone vapor detection characteristics. The results revealed that the sensitivity (Sf) increased from room temperature to 150 oC and thereafter decreased. The sensitivity increased with acetone concentration from 100-5000 ppm at an optimum temperature of 150oC. The composite with higher Sr(II) content on ZnAl2O4 matrix (ZnSA5) showed the best sensitivity to acetone detection.

 

Keywords: ZnAl2O4; VOC sensor; composites; ceramics; sol-gel chemistry

 

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