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Vol. 186, Issue 3, March 2015, pp. 140-147




Physics and Technology of Humidity Sensing Through a Solid State Pellet of Cerium Oxide

1 Monika SINGH, 1, 2,* B. C. YADAV

1 Nanomaterials and Sensors Research Laboratory, Department of Physics, Lucknow University, Lucknow-226007, India
2 Department of Applied Physics, School for Physical Sciences, B. B. Ambedkar University, Lucknow-226025, U. P., India

* E-mail: balchandra_yadav@rediffmail.com


Received: 8 December 2014 /Accepted: 27 February 2015 /Published: 31 March 2015

Digital Sensors and Sensor Sysstems


Abstract: This paper reports the physics and technology of cerium oxide as solid state humidity sensor. Pellet of cerium oxide powder having diameter 9 mm and thickness 3 mm was made by hydraulic pressing machine under a load of 616 MPa and annealed at 200, 400, 600, 800 oC for 2 hrs in an electric furnace successively. After each step of annealing, this pellet was exposed to humidity in a specially designed humidity chamber. It was observed that as relative humidity (%RH) increases, there is a decrease in the resistance for the entire range of humidity i.e. from 15 to 95 %. The sensitivity of the humidity sensor was found 26 MW/%RH at room temperature. The proposed method in this study provides a simple, reliable and sensitive humidity sensor. The gross structural/phase identification of the pellets/powder was done using X-ray diffraction (XRD) and the surface morphology by scanning electron microscopy (SEM).


Keywords: Humidity, Pellet, Sensitivity, Cerium oxide, SEM, XRD.


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