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Vol. 113, Issue 2, February 2010, pp. 48-55

 

Bullet

 

Humidity Sensing Properties of CuO, ZnO and NiO Composites

 

Vedhakkani JESEENTHARANI, Boniface JEYARAJ, John PRAGASAM, Arunachalam DAYALAN, *Karachalacheruvu Seetharamaiah NAGARAJA

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

Loyola College, Chennai 600 034, India

*Tel.:+91- 44 28178200, fax:+91 44 28175566

E-mail: jeseentha@gmail.com, dr.ksnagaraja@gmail.com

 

 

Received: 15 December 2009   /Accepted: 19 February 2010   /Published: 26 February 2010

 

Abstract: The mixed metal oxides were investigated for humidity sensing properties. The composites were prepared by mixing 1:1 mole ratio of CuO-ZnO, CuO-NiO, and NiO-ZnO compound. The samples sintered at 800 oC for 5h, were subjected to do resistance measurements as a function of relative humidity (RH) in the range of 5-98 % and the sensitivity factor was calculated. Among the three composites, CuO-NiO compound possessed the highest humidity sensitivity of 2834.8 while the other two possessed a very low sensitivity factor. The response and recovery of the CuO-NiO composites were 650 and 80 s. X-ray diffraction, and scanning electron microscopy (SEM) was employed to identify the structural phases, and surface morphology of the metal oxide compounds.

 

Keywords: humidity sensor; solid state electrical conductivity, mixture oxides of Cu, Zn and Ni

 

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