Application of nanoparticulate conducting polyaniline in nanofilm biosensor technology
Morrin, Aoife and Ngamna, Orawan and Lori, Joseph A. and Wallace, Gordon and Killard, Anthony J. and Smyth, Malcolm R. (2004) Application of nanoparticulate conducting polyaniline in nanofilm biosensor technology. In: ESEAC 2004 Tenth International Conference on Electroanalysis, 6-10 June 2004, NUIG, Galway, Ireland.
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This biosensor uses a novel aqueous-based nanoparticulate polyaniline (PANI), synthesised using dodecylbenzenesulphonic acid (DBSA) and aniline as starting material. These polymer nanoparticles have been electrodeposited on to the surface of carbon electrodes resulting in conductive nano-films, which were examined by electrochemistry, scanning electron microscopy (SEM), atomic force microscopy (AFM), profilometry and spectroelectrochemistry. Biomolecules were then electrostatically adsorbed onto this surface and physical techniques have shown that the nanofilm possesses properties which allow for uniform adsorption of protein to take place. This effective biosensor format has been characterised using a horseradish peroxidase (HRP) and H2O2 format. This sensor exhibits higher signal/noise (S/N) ratios and quicker response times than previous PANI biosensor formats developed by our group, due to its nanofilm characteristics
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