Senguttuvan, T. D. and Srivastava, Vibha and Tawal, Jai S. and Mishra, Monika and Srivastava, Shubhda and Jain, Kiran (2010) Gas sensing properties of nanocrystalline tungsten oxide synthesized by acid precipitation method. Sensors and Actuators B: Chemical, 150 (1). pp. 384-388. ISSN 0925-4005

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Abstract

WO3·2H2O samples were prepared by acidic precipitation of sodium tungstate solution. Nanocrystalline WO3 powders were obtained after 350 and 600 ◦C calcinations. XRD patterns of these samples showed a diffraction profile similar to that of monoclinicWO3. Calcinations at 600 ◦C yieldWO3 powders with particle sizes ranging from 60 to170nm whereas that for 350 ◦C calcinations are in the range of 30–150 nm. The gas sensing properties of these powders in the form of thick film were investigated with and without platinum doping. Gas response of thick films sintered at two different temperatures was measured at four different operating temperatures. We confirm that the sensor elements made from 600 ◦C calcined powders doped with platinum sintered at 800 ◦C are highly responsive and selective to ammonia vapour at 350 ◦C operating temperature as compared to sensor elements made from commercial powders.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	WO3; Metal oxide; Gas sensor; Ammonia sensor; Thick film; Chemical synthesis
Subjects:	Chemistry Electrochemistry Instruments/ Instrumentation
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	20 Apr 2012 11:40
Last Modified:	20 Apr 2012 11:40
URI:	http://npl.csircentral.net/id/eprint/169

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