Research Article
Open Access
Studies on Copper Molybdate as Humidity Sensor
C. Manjula1, N. Prakash2*, S. Arungalai Vendan3, N.G. Renganathan4
1Department of Physics, Thangavelu Engineering College, Chennai-600 097, India
2Department of Chemistry, Thangavelu Engineering College, Chennai-600 097, India
3School of Electrical Engineering (SELECT), VIT University, Vellore, India
4Department of Chemistry, Vel Tech University, Chennai-600 063, India
2Department of Chemistry, Thangavelu Engineering College, Chennai-600 097, India
3School of Electrical Engineering (SELECT), VIT University, Vellore, India
4Department of Chemistry, Vel Tech University, Chennai-600 063, India
N. Prakash et al /Int.J. TechnoChem Res. 2018,4(1),pp 57-64.
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.
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.
Keywords
Humidity sensor, Copper molybdate, Rh levels ionic conduction
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