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Vol. 122, Issue 11, November 2010, pp.20-27

 

Bullet

Humidity Sensing Behaviour of Nanocrystalline α-PbO Synthesized by Alcohol Thermal Process

 

1Sk. Khadeer Pasha, 1L. John Kennedy, 2J. Judith Vijaya, 1*K. Chidambaram

1Materials Division, School of Advanced Sciences, VIT University, Vellore-632 014, India

 2Catalysis & Nanomaterials Research Laboratory, Department of Chemistry, Loyola College,

Chennai-600 034, India

*Tel.: +91-416-2202200, fax: +91-416-2243092

E-mail: kccbb99@yahoo.co.in, khadheerau@yahoo.com

 

 

Received: 13 February 2010   /Accepted: 18 November 2010   /Published: 30 November 2010

 

Abstract: Alcohol thermal route has been used to synthesize meta stable nanocrystalline α-PbO at a relatively low temperature of 75 oC using lead acetate. The synthesized α-PbO (P75) was subjected to different heat treatment with temperatures ranging from 200-500 oC for 2 h to study the effect of crystallinity and phase changes and were labeled as P200, P300, P400 and P500, respectively. X-Ray diffraction and FT-IR spectroscopy were carried out to identify the structural phases and vibrational stretching frequencies respectively. The TEM images revealed the porous nature of P75 sample which is an important criterion for the humidity sensor. All the samples were subjected to different humidity levels (5 98 %). Among the different composites prepared, P75 possessed the highest humidity sensitivity of 5000, while the heat treated sample P500 possessed a low sensitivity of 127. The response and recovery characteristics of the maximum sensitivity sample P75 were 210 s and 140 s respectively.

 

Keywords: α-PbO, Humidity sensor, Low temperature sensor, TEM, Alcohol thermal method

 

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