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Polyaniline/polyimide blends as gas sensors and electrical conductivity response to CO–N2 mixtures

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The effects of dopant type, doping level, polyimide (PI) content and temperature on electrical conductivity response of polyaniline (PANI) and polyaniline/polyimide (PANI/PI) blends to CO–N2 gas mixtures were systematically investigated. At the same doping level, HNO3‐doped PANI has a greater electrical conductivity response and sensitivity towards CO than that of camphor sulfonic acid (CSA)‐doped PANI because the former has a more ordered structure. The interaction mechanism between CO and PANI is proposed to occur at the attack site, —N¨H— or the amine nitrogen where CO withdraws an electron. Addition of PI causes a small change in electrical conductivity under atmospheric conditions when PI content is below the percolation threshold value of 55 wt%. Addition of PI reduces brittleness and improves electrical conductivity sensitivity towards CO; the effect is more pronounced at higher temperatures. Copyright © 2005 Society of Chemical Industry
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Keywords: CO sensor; electrical conductivity; polyaniline; polyimide

Document Type: Research Article

Affiliations: 1: Conductive and Electroactive Polymers Research Unit & The Petroleum and Petrochemical College, Chulalongkorn University, Phayathai Road, Bangkok 10330, Thailand 2: Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109-2136, USA

Publication date: August 1, 2005

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