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Vol. 143, No. 8, August 2012, pp. 152-161

 

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Resistive Type Moisture Sensor based on WO3 Nanomaterial
 

1 Anupam Tripathi, 2 Vidhu Tripathi, 3 N. K. Pandey, 4 Karunesh Tiwari

1 Department of Physics, BBDNIIT, Lucknow U.P., India

2 Department of Physics, BBDESGI, Lucknow U.P., India

3 Department of Physics, University of Lucknow, Lucknow U.P., India

4 Department of Physics, BBDNITM, Lucknow U.P., India

E-mail: anu_198117@yahoo.co.in, karunesh81@gmail.com

 

Received: 30 May 2012   /Accepted: 21 August 2012   /Published: 28 August 2012

Digital Sensors and Sensor Sysstems

 

Abstract: Various materials have been studied and used as sensing elements in humidity measurement applications [1-3]. Some metal oxides such as TiO2, SnO2, ZnO, Cr2O3 and WO3 are semi-conducting materials among which WO3 has been studied extensively because of its electro-chromic applications. Tungsten oxide and binary systems of tungsten oxide with other metal oxides are also being studied for their gas and humidity sensing applications. Sensors of great variety of application have been developed, numerous materials have been utilized for humidity sensing of which the metal oxides that are physically and chemically stable, have been extensively used at both room and elevated temperature [4-9]. This paper reports resistive type humidity sensing properties of composite powder of WO3. Specific Sensitivity of the sensor is defined as the change in resistance (ΔR) of sensing element per unit change in relative humidity (RH %) per unit resistance, i.e. ΔS = ΔR/ R (Δ RH %)

 

It is observed that the specific sensitivity in the range 10 to 40 % RH has remained almost constant after one month for all annealing temperature of 300 ˚C, 400 ˚C, 500 ˚C. However in the same range the values have been decreased substantially when the sensing element has been examined after six months for all the annealing temperatures of 300 ˚C, 400 ˚C, 500 ˚C. The value of specific sensitivity in the higher 40 to 85 % RH range shows good repeatability after one month and six months both for all the annealing temperature of 300 ˚C, 400 ˚C, 500 ˚C.

 

Keywords: Tungsten trioxide, Specific sensitivity, Annealing temperature

 

 

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