Spectroelectrochemical reactivities of novel polyaniline nanotube pesticide biosensors,
Abstract
The preparation and characterisation of electrosynthetic polyaniline
nanomaterials doped with phenanthrene sulphonic acid (PSA) is being presented.The polymeric nanomaterials prepared include processable poly(o-methoxy aniline)(POMA) and poly(2,5-dimethoxy aniline) (PDMA). Spectroelectrochemical reactivities of the electroactive polymeric nanotube systems as well as the nanobiosensor systems were studied by SEM, FTIR, UV-Vis and Subtractively Normalised Fourier.Transformed Infrared Spectroscopy (SNIFTIRS) techniques. Furthermore, cyclic and differential pulse voltammetric studies of the nanomaterials were also performed
using platinum or thiol-modulated gold electrodes. The SEM studies confirmed the nanorodmorphologyofthepolyanilines.Theheterogeneousrateconstant
ko,forthe
nanopolymeric material and the diffusion coefficient of electrons, De, was calculated and found to be in agreement with values expected for electron hopping along conducting polymer chains. Organophosphate pesticide nanobiosensor devices were
prepared by encapsulating acetylcholinesterase (AChE) in the nanopolymeric composite.The biosensor amperometric response to the organophosphate pesticide called diazinon and the carbamate pesticide called carbofuran were studied. The
sensor responses to pesticides followed typical electrochemical Michaelis-Menten kinetics.Keywords: biosensor; nanotube; pesticide; polyaniline; Spectroelectrochemistry
Citation
Spectroelectrochemical reactivities of novel polyaniline nanotube pesticide biosensors,, MICHIRA, DR. IMMACULATE NYAMBURA , Macromolecular Symposia, 2007, 255, 36-49, (2007) copy at http://profiles.uonbi.ac.ke/imichira/publications/spectroelectrochemical-reactivities-novel-polyaniline-nanotube-pesticide-biosePublisher
Department of Chemistry