Vol. 91, Issue 4, April 2008, pp.109-115

Sr(II)-added ZnAl₂O₄ Spinel Composites as an Ammonia Sensor

J. Judith Vijaya^*a,b, L. John Kennedy^c, G. Sekaran^c and K.S. Nagaraja^a

a. Department of Chemistry, Loyola College, Chennai- 600 034, India.

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

Chennai- 600 034, India.

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

Chennai – 600 020, India

Tel: +91-44-28178200, Fax: +91-44-28175566

E-mail: jjvijayaloyola@yahoo.co.in

Received: 14 March 2008   /Accepted: 21 April 2008   /Published: 30 April 2008

Abstract: Pure and strontium(II) added ZnAl₂O₄ composites was prepared by sol – gel technique and tested for the detection of ammonia vapor. XRD, SEM and BET measurements were employed to identify the structural phases, surface morphology and surface area of the composites. The composites sintered at 900^oC for 5h, were subjected to dc resistance measurements in the temperature range of 50-250^oC to study the ammonia vapor sensing characteristics. With increase in temperature the sensitivity increases up to the optimum temperature and thereafter decreases. An increase in the sensitivity was observed with increase in ammonia concentration from 100-5000 ppm at their respective optimum temperature. Among the composites, ZnSA5 with higher Sr(II) content  showed the best sensitivity towards ammonia vapor detection.

Keywords: Ammonia vapor; Composites; Electrical properties; Sensors; Sol – gel preparation; Ceramics

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