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Vol. 104, Issue 5, April 2009, pp.109-118

 

 

Bullet

 

Humidity Sensing Studies of WO3-ZnO Nanocomposite

 

*N. K. Pandey, Anupam Tripathi, Karunesh Tiwari

Sensors and Materials Research Laboratory, Department of Physics,

University of Lucknow, Lucknow-226007, U.P. India

Tel.: 91 522 2740410, 91 9415003998, fax: 91 522 2740462

*E-mail: nkp1371965@rediffmail.com

 

 

Received: 27 February 2009   /Accepted: 19 May 2009   /Published: 25 May 2009

 

Abstract: Paper reports morphological and humidity sensing studies of nanocrystalline WO3:ZnO composite powder pellet prepared in the weight % ratio of 10:1 by solid-state reaction route. Pellets of this composition have been prepared under a uniaxial pressure of 260 Pa. The pellets have been annealed at temperatures of 300-500C. SEM micrograph for sensing element shows that the sensing element manifests porous structure. Particles are distributed in form of granules and agglomerated having bunched like structure due to the presence of zinc ions in ZnWO4, which is formed during solid state reaction between WO3 and ZnO. The Particles are having their sizes in the range 67 nm to 140 nm. Humidity sensing application of the pellets has been studied in a specially designed humidity chamber. It has been observed that as relative humidity (RH) increases, there is decrease in the resistance of pellet for the entire range 10-85 % RH. The sample is observed to have good reproducibility and less effect of ageing in the 40-85 % relative humidity range as compared to that in the 10-40 % relative humidity range for the annealing temperatures 400C and 500C.

 

Keywords: Humidity sensor, WO3-ZnO, Nanocomposite, Humidity sensing

 

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