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Spectroelectrochemical Reactivities of Novel Polyaniline Nanotube Pesticide Biosensors
Author(s) -
Somerset V.,
Klink M.,
Akinyeye R.,
Michira I.,
Sekota M.,
AlAhmed A.,
Baker P.,
Iwuoha E.
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200750905
Subject(s) - polyaniline , nanomaterials , aniline , conductive polymer , cyclic voltammetry , materials science , biosensor , fourier transform infrared spectroscopy , nanotube , chemical engineering , amperometry , chemistry , polymer , nanotechnology , electrochemistry , electrode , carbon nanotube , organic chemistry , composite material , polymerization , engineering
Summary: 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 nanorod morphology of the polyanilines. The heterogeneous rate constant, k o , for the nanopolymeric material and the diffusion coefficient of electrons, D e , 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.