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Novel biosensor fabrication methodology based on processable conducting polyaniline nanoparticles

Morrin, Aoife and Wilbeer, Frank and Ngamna, Orawan and Moulton, Simon E. and Killard, Anthony J. and Wallace, Gordon G. and Smyth, Malcolm R. (2005) Novel biosensor fabrication methodology based on processable conducting polyaniline nanoparticles. Electrochemistry Communications, 7 (3). pp. 317-322. ISSN 1388-2481

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Abstract

This work investigates polyaniline (PANI) nanoparticles, (synthesised using dodecylbenzenesulphonic acid (DBSA) as a dopant), as a novel, highly processable, non-diffusional mediating species in an enzyme biosensing application. These nanoparticles are readily dispersed in aqueous media which helps overcome some of the processability issues traditionally associated with polyaniline. Modification of screen-printed electrodes was readily achieved with these aqueous nanoparticle dispersions, where the nanoparticles were simply cast by a drop-coating method onto the surface. After suitable pH adjustment, it was shown that horseradish peroxidase (HRP) enzyme could be added to the dispersion, and cast simultaneously with the conducting polyaniline. This effective fabrication method involves no electrochemical steps, and as such is easily amenable to mass production. The feasibility of casting enzyme with polyaniline nanoparticles is demonstrated in this short communication. More accurate deposition of protein-containing inks onto screen-printed carbon working electrodes could in the future transfer the drop-coating protocol from manual deposition to largescale production by mechanical methods such as ink-jet printing.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:nanoparticles; polyaniline; biosensor; casting; screen-printed electrodes;
Subjects:Physical Sciences > Chemical detectors
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.elecom.2005.01.014
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:46
Deposited On:08 Nov 2006 by DORAS Administrator. Last Modified 30 Jan 2009 11:28

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