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Vol. 91, Issue 4, April 2008, pp.127-133




Cobalt Chloride  Doped Polymer Film for Relative Humidity Measurement


Pabitra NATH,  Hidam Kumarjit SINGH, Pranayee DATTA, Kanak. Ch. SARMAH*

Department of Electronics Science, Gauhati University, Guwahati 781014, India

*Department of Department of Instrumentation and USIC , Gauhati University, Guwahati 781014, India

E-mail: pnath07@gmail.com



Received: 2 March 2008   /Accepted: 21 April 2008   /Published: 30 April 2008


Abstract: We report a novel relative humidity sensing technique with high dynamic range and fast response time. Thin CoCl2 doped polymer films of different thickness  were fabricated on thin cover slides using dip coating technique. Expanded light from a diode laser source ( 680 nm ) is allowed to transmit through the sensing film of the  slide. As large area of the sensing region is exposed to the environment, high sensitivity of the sensor is achieved. Further, sensor response was investigated in terms of chemically synthesized film thickness on the slides. A high dynamic range of the sensor is obtained  with fully reversible and repeatable behavior. The advantage of the system is its simplicity and is a low cost technique to monitor relative humidity present in the environment.


Keywords: Relative humidity, Sensor, CoCl2  thin film


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