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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 14:46 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Polymer Physics
Title:
Vapour detection with sensors based on polyaniline structures with controlled redox states
Authors:
Carmen Cristescu, Adriana Andronie, Stefan Iordache, Marian Mocanu and Livia Maria Constantinescu
Affiliation:
3Nano-SAE Research Centre, University of Bucharest, PO Box MG-38, Bucharest-Magurele, Romania
E-mail
k_cristescu@yahoo.com
Keywords:
polyaniline, sensor
Abstract:
Sensor arrays for detection of vapors mixtures is a challenge for redox polymers such as polyaniline (Pani) and polypyrole chemical or electrochemical processed. There are several key issues in designing of sensor array in nanofibers by interfacial electropolymerization in a template. Polyaniline nanofibers are found to have superior performance relative to conventional materials due to their much greater exposed surface area. A template-free electrochemical synthesis that produces uniform polyaniline nanofibers with diameters below 100 nm is described. Resistive-type sensors made from undoped or doped polyaniline nanofibers outperform conventional polyaniline on exposure to acid or base vapors, respectively. Nanofibers show essentially no thickness dependence to their sensitivity. The template used is nanoporous alumina made of aluminum anodization. The redox states are controlled by cyclic voltammetry induced in a self-doped polyaniline from anilinium sulphate monomer. Resistive response and detection limit for different vapors are presented.
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