C. Manjula, N. Prakash, S. Arungalai Vendan, N.G. Renganathan

ABSTRACT

Monitoring and controlling environmental humidity is receiving wider attention mainly for physical comfort and for industrial processes. In this attempt copper molybdate is used as humidity sensor. It is synthesized by solution method. Using electronic sensor kit output voltages are measured for different output voltages are measured for different percentage of humidity. Standardization of the electronic sensor kit is done using known values of Rh. Resistive sensors measure the change of humidity. At low Rh levels the electronic conduction based on the electron donation from water molecule is the dominant mechanism. At medium Rh levels both electronic and ionic conduction are responsible with the dominant transition from electronic to ionic conduction mechanism. At high Rh levels ionic conduction based on proton hopping between water molecules is the dominant mechanism. Copper molybdate behaves as a good humidity sensor at all levels and the results of this compound as humidity sensor are presented and discussed in this paper. Key words: Humidity sensor, Copper molybdate, Rh levels ionic conduction