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Vol. 37, Issue 11,  November 2003, pp. 30-37

 

Bullet

 

Humidity Sensing Properties of ZnWO4-ZnO Composite

 

R. SUNDARAM and K. S. NAGARAJA*

 

Department of Chemistry and Loyola Institute of Frontier Energy (LIFE),

Loyola College, Chennai 600 034, Tamil Nadu, India

Phone: +91-44-28175660, Fax:+91-44-28175566

E-mail: ksnagi@vsnl.net, ksnraja@loyolacollege.edu

 

 

Received: 11 November 2003   /Accepted: 18 November 2003   /Published: 22 November 2003

 

Abstract: Humidity sensing properties of composites made from ZnWO4 (ZW) and ZnO (ZO) were investigated. Sintered polycrystalline disks of ZnWO4 (ZWZO-10) and ZnO (ZWZO-01) and composites of ZW and ZO in the mole ratios of ZWZO-8:2, 6:4, 4:6 and 2:8 (ZWZO-8:2 designated as 80 mole % of ZnWO4 and 20 mole % of ZnO), respectively, were subjected to DC resistance measurements as a function of relative humidity in the range of 5-98% RH. The DC conductance measurements were carried out on the samples from which the activation energies were determined. The composite ZWZO-28 has the highest humidity sensitivity (3 x 103) with a response (2 min.) and recovery (7 min.) time attributed to the optimization of pore size and its even distribution in a biphasic matrix which is a metastable mixture of the two terminal phases, ZnWO4 and ZnO.

 

Keywords: ZnWO4 ZnO composites, Electrical properties, Humidity sensor

 

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