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Vol. 125, Issue 2, February 2011, pp.68-75

 

Bullet

Optical Characterization and Humidity Sensing Properties of Praseodymium Oxide

 

*B. C. YADAV, Monika SINGH and C. D. DWIVEDI

Nanomaterials and Sensors Research Laboratory, Department of Physics, University of Lucknow, Lucknow-226007, India

Tel.: +91 9450094590, fax: +91 522 4060185,

*E-mail: balchandra_yadav@rediffmail.com

 

 

Received: 3 December 2010   /Accepted: 15 February 2011   /Published: 28 February 2011

 

Abstract: This paper reports the humidity sensing properties of praseodymium oxide (99 % pure, Johnson & Matthey, London) and its characterization. The pellet of praseodymium oxide was made under a pressure of 616 MPa and it was annealed at 200, 400, 600 and 800 oC for 2 hrs successively. After each step of annealing, the pellet was exposed to humidity. It was observed that as relative humidity (% RH) increases, there is a decrease in the resistance for entire range of humidity. The highest sensitivity of the humidity sensor was found 6 MΩ/%RH at room temperature. Distribution of grains and pores were observed by SEM. XR D of sensing material revealed the phase and lattice structure of praseodymium oxide. Crystallite size of sensing material lies between 132-297 nm. The proposed investigation provides a new step in developing towards simple, reliable and sensitive humidity sensor.

 

Keywords: Humidity sensor, sensitivity, XRD, SEM

 

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