Special Issue on Nanoscience and Technology (ICONSAT 2010); Edited by D. Bahadur, Satish Vitta and A. K. SoodNo Access

Au/TiO₂ NANOTUBES FOR SELECTIVE DETECTION OF DOPAMINE

Alternative Energy and Nanotechnology Laboratory, Nano Functional Materials Technology Centre, Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India

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SATHISH KUMAR SRINIVASAN

Alternative Energy and Nanotechnology Laboratory, Nano Functional Materials Technology Centre, Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India

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SUNDARA RAMAPRABHU

Alternative Energy and Nanotechnology Laboratory, Nano Functional Materials Technology Centre, Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India

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https://doi.org/10.1142/S0219581X11008460Cited by:2 (Source: Crossref)

Abstract

A novel biosensor for dopamine (DA) detection was fabricated using TiO₂ nanotube and Au/TiO₂ nanotube films on glassy carbon electrode (GCE). The Au/TiO₂ nanotubes on electrode showed better electrocatalytic activity towards the detection of DA which was attributed to its excellent electron conductive network. The biosensor elicited sensitivity of 22 nA/μM with a linearity of detection localized in the concentration range from 5–120 μM with correlation coefficient of 0.99. The detection limit of DA for the Au/TiO₂ nanotube biosensor was found to be ~3 μM (S/N = 3). In addition, the fabricated sensor showed good anti-interference capability towards biological compounds such as ascorbic acid and uric acid. In conclusion, Au/TiO₂ nanotube biosensor exhibits excellent catalytic activity, selectivity and simplicity for the detection of dopamine.

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