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Sensors 2009, 9(2), 1094-1107; doi:10.3390/s90201094

Enhanced Photoelectrochemical Detection of Bioaffinity Reactions by Vertically Oriented Au Nanobranches Complexed with a Biotinylated Polythiophene Derivative

1
National Center for Nanoscience and Technology, Beijing 100190, P.R. China
2
Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R. China
*
Authors to whom correspondence should be addressed.
Received: 31 December 2008 / Revised: 10 February 2009 / Accepted: 11 February 2009 / Published: 19 February 2009
(This article belongs to the Section Biosensors)
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Abstract

Four nanostructured Au electrodes were prepared by a simple and templateless electrochemical deposition technique. After complexing with a biotinylated polythiophene derivative (PTBL), photocurrent generation and performance of PTBL/Au-nanostructured electrodes as photoelectrochemical biosensors were investigated. Among these four nanostructured Au electrodes, vertically oriented nanobranches on the electrode significantly improved the photoelectric conversion, because the vertically oriented nanostructures not only benefit light harvesting but also the transfer of the photogenerated charge carriers. Owing to this advantaged nanostructure, the PTBL/Au-nanobranch electrode showed higher sensitivity and faster response times in the photoelectrochemical detection of a streptavidin-biotin affinity reaction compared to a PTBL/Au-nanoparticle electrode. View Full-Text
Keywords: Nanostructure; Photoelectric conversion; Photoelectrochemical biosensor Nanostructure; Photoelectric conversion; Photoelectrochemical biosensor
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Zhou, H.; Tang, Y.; Zhai, J.; Wang, S.; Tang, Z.; Jiang, L. Enhanced Photoelectrochemical Detection of Bioaffinity Reactions by Vertically Oriented Au Nanobranches Complexed with a Biotinylated Polythiophene Derivative. Sensors 2009, 9, 1094-1107.

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