Impedance studies of an LPG sensor using surface ruthenated tin oxide

Chaudhary, V.A. ; Mulla, I. S. ; Vijayamohanan, K. (1999) Impedance studies of an LPG sensor using surface ruthenated tin oxide Sensors and Actuators B: Chemical, 55 (2-3). pp. 127-133. ISSN 0925-4005

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A preliminary study of the impedance data as a function of frequency (100 mHz-100 kHz) for pure and surface ruthenated tin oxide with and without LPG indicates the important role of surface states in enhancing the sensitivity of the surface functionalized tin oxide gas sensor. Different types of processes such as diffusion in the pores and electron-transfer due to surface reactions are found to occur at different operating temperatures and the mechanism of hydrocarbon sensing is found to drastically change with temperature in the operational range. For example, the samples at 250°C show diffusion controlled behaviour while those at 350°C predominantly show charge transfer control. The behaviour of these systems are studied with plausible equivalent circuits and a clear distinction has been observed for the surface ruthenated samples, which could be responsible for the enhanced sensitivity at these temperatures.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Impedance Measurements; Surface Functionalization; Tin Oxide Gas Sensor; Surface States
ID Code:68877
Deposited On:07 Nov 2011 05:06
Last Modified:07 Nov 2011 05:06

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