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Nanotechnology

Title:		Polyaniline nanoparticle-carbon nanotube hybrid network vapour sensors with switchable chemo-electrical polarity
Author(s):		Lu J; Park BJ; Kumar B; Castro M; Choi HJ; Feller JF;
Address:		"European University of Brittany (UEB), LIMATB-UBS, Lorient, France"
Journal Title:		Nanotechnology
Year:		2010
Volume:		20100528
Issue:		25
Page Number:		255501 -
DOI:		10.1088/0957-4484/21/25/255501
ISSN/ISBN:		1361-6528 (Electronic) 0957-4484 (Linking)
Abstract:		"Chemo-resistive sensors were prepared from monodisperse poly(aniline) nanoparticles (PaniNP) synthesized via oxidative dispersion polymerization. Poly(styrene sulfonic acid) (PSSA) was used as the stabilizer and dopant agent. PaniNP transducers were assembled by spraying layer by layer a solution containing different concentrations of PaniNP and multi-wall carbon nanotubes (MWNT) onto interdigitated electrodes. This process led to stable sensors with reproducible responses upon chemical cycling. Chemo-electrical properties of these sensors have been investigated in sequential flows of pure nitrogen and nitrogen saturated with a set of volatile organic compounds (VOC). Interestingly the sensing mode of PaniNP transducers (the NVC or PVC effect) can be switched simply by increasing PaniNP content or by the addition of only 0.5% of MWNT to reach a resistance lower than 150 Omega. Due to their original conducting architecture well imaged by atomic force microscopy (AFM), i.e. a double percolated conductive network, PaniNP-MWNT hybrids present both higher sensitivity and selectivity than other formulations, demonstrating a positive synergy. Mechanisms are proposed to describe the original chemo-electrical behaviours of PaniNP-based sensors and explain the origin of their selectivity and sensing principle. These features make them attractive to be integrated in e-noses"
Keywords:
Notes:		"PubMed-not-MEDLINELu, Jianbo Park, Bong Jun Kumar, Bijandra Castro, Mickael Choi, Hyoung Jin Feller, Jean-Francois eng Research Support, Non-U.S. Gov't England 2010/05/29 Nanotechnology. 2010 Jun 25; 21(25):255501. doi: 10.1088/0957-4484/21/25/255501. Epub 2010 May 28"