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Vol. 135, Issue 12, December 2011, pp.98-109

 

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Morphological, Humidity and Liquefied Petroleum Gas (LPG) Sensing Investigations on Tantalum Oxide

 

1 Ritesh KUMAR, 1, 2* B. C. YADAV, 1 Tripti SHUKLA, 1 Rajeev SINGH and 3 Shyam SINGH

1 Nanomaterials and Sensors Research Laboratory

Department of Physics, Lucknow University, Lucknow, U. P., India

2 Department of Applied Physics, Babasaheb Bhimrao Ambedkar University, Lucknow, U.P., India

3 R. R. Institute of Modern Technology, Lucknow, U.P., India

Tel.: +91-522-2998891, mob.: +919450094590

* E-mail: balchandra_yadav@rediffmail.com

 

 

Received: 16 September 2011   /Accepted: 16 December 2011   /Published: 28 December 2011

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Abstract: This paper reports the morphological, humidity and Liquefied Petroleum Gas (LPG) sensing properties of Tantalum Oxide. The pellet of sensing material was prepared by hydraulic pressing machine at a pressure of 616 MPa at room temperature. It was annealed at 200, 400, 600 and 800 C successively for 3 h and after each step of annealing; the sensing material was investigated using Scanning Electron Microscope. Minimum crystallite size, calculated from Debye-Scherrer formula was found to be 20 nm. Effects of annealing on surface morphology and electrical resistivity of sensing material have been also deliberated. It has been observed that with the increase in percentage relative humidity (%RH) inside the chamber, there is corresponding decrease in the resistance values of pellet for the range from 25 to 95 %RH. Average sensitivity of the sensor is found 27 MΩ/%RH and in case of LPG sensing the maximum average sensitivity is 7. Reproducibility, hysteresis and ageing effect have been also investigated.

 

Keywords: Humidity, LPG, Resistance, Sensitivity, Annealing, Morphology, SEM and XRD

 

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