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Vol. 122, Issue 11, November 2010, pp.113-119



Lead Oxide- PbO Humidity Sensor


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

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

 2 Catalysis & 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: 2 July 2010   /Accepted: 18 November 2010   /Published: 30 November 2010


Abstract: Alcohol thermal route has been used to synthesize nanocrystalline PbO at a low temperature of 75 oC using lead acetate. The synthesized PbO (P75) was annealed in the temperatures ranging from 200-500 oC for 2 h to study the effect of crystal structure 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. The dc resistance measurements were carried out in the relative humidity (RH) range 5-98 %. Among the different prepared, P75 possessed the highest humidity sensitivity of 6250, while the heat treated sample P500 have a low sensitivity of 330. The response and recovery characteristics of the maximum sensitivity sample P75 were 170 s and 40 s respectively.


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


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