Template-Assisted Electrochemical Growth of Polypyrrole Nanotubes for Development of High Sensitivity Glucose Biosensor
In this paper, we report the growth of polypyrrole (PPy) nanotube arrays using template-assisted electrochemical polymerization to fabricate enzymatic glucose biosensors. The PPy nanotubes were grown on platinum-coated alumina membranes (Anodisc™s). By varying the polymerization time during the potentiostatic electropolymerization, the size/diameter of the PPy nanotubes were controlled, leading to changes in the subsequent enzyme immobilization (via physical adsorption). Enzyme electrode thus fabricated resulted in to the optimum sensitivity of 18.6 mA cm−2 M−1, a wide range of linear operation (0.25–20 mM) and the lowest detection limit of 0.25 mM glucose concentration for the biosensor with the polymerization time of 40 s. The effect of polymerization duration on the sensitivity has been explained on the basis of porosity and enzyme-loading capacity of polymerized electrodes.
KeywordsGlucose biosensor Polypyrrole Glucose oxidase Amperometric Sensitivity Porosity Anodisc™
One of the authors P. A. P. is grateful to FESEM, Fluorescence and Potentiostat/Galvanostat facilities equipped at the Sophisticated Instrument Centre, IIT Indore. P. A. P. would also like to thank Dr. Mukul Gupta (University Grants Commission Department of Atomic Energy (UGC DAE) Consortium for Scientific Research Indore (M. P.), India) for the usage of the DC magnetron sputtering system. P. A. P. would further like to thank the Ministry of Human Resource and Development (MHRD), India for providing the Teaching Assistantship (TA). Author V. S. would like to thank director of IIT Indore for providing the seed grant for the research.
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