Kaushik, Ajeet and Khan, Raju and Gupta, Vinay and Malhotra, B. D. and Ahmad, Sharif and Singh, S. P. (2009) Hybrid Cross-Linked Polyaniline-WO3 Nanocomposite Thin Film for NOx Gas Sensing. Journal of Nanoscience and Nanotechnology, 9 (3). pp. 1792-1796. ISSN 1533-4880

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Abstract

Nanocomposite thin film of cross-linked polyaniline [CLPANI, derived from polyaniline and aniline formaldehyde condensate (AFC)] and WO3 has been fabricated using vacuum thermal evaporation technique. X-ray diffraction pattern of as-grown film shows broad reflections of polymer along with mixed reflection of nonhydrated and hydrated WO3 nanoparticles. The scanning electron microscopy studies reveal uniform dispersion of WO3 nanoparticles in CLPANI network. The broadening of the absorption band at 320 nm corresponding to PANI and AFC-WO3 nanocomposite is attributed to cross-linking between the polymeric units. The NOx gas sensing characteristics of vacuum deposited CLPANI-WO3 thin film have been studied by measuring the change in resistance with respect to time. The sensor can be operated at room temperature, resulting in extended shelf life of the sensor. The response time and recovery time of the sensor operated at room temperature have been experimentally determined as 30 s and 11 minutes respectively.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Scientific Publishers.
Uncontrolled Keywords:	CROSS-LINKED POLYANILINE; TUNGSTEN OXIDE; NANOCOMPOSITE THIN FILM; NO2 GAS SENSORS
Subjects:	Biochemistry & Molecular Biology Chemistry Genetics & Heredity Microscopy Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	03 Sep 2012 08:00
Last Modified:	03 Sep 2012 08:00
URI:	http://npl.csircentral.net/id/eprint/525

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