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Electrochemical Detection of Biomolecule with Mixed Self-Assembled Monolayers of Ferrocene-Undecanethiol

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Thiol self-assembled monolayers (SAMs) have been widely used as a modification method to immobilize biomolecules to gold surfaces. However, the additional layers of SAM and biomolecules make electron transfer difficult, leading to a large overpotential in electrical signal. Electron transfer mediation is the most popular solution to overcome the problem of the overpotential for an electrochemical biosensor. We introduced mixed SAMs of mercapto-dodecanoic acid (MDA) and ferrocene-undecanthiol. Ferrocene-undecanthiol acts as an electron transfer mediator and MDA is used for immobilization of biomolecule. The electron transferability of mixed SAMs is affected by pH, kinds of electrolytes, and the composition of the thiol molecule. We optimized the carboxyl acid and ferrocene molecule ratio which is a crucial factor in the performance of mixed SAMs and electrochemically detected the avidin. The detection limit was 2.0 g/mL of avidin concentration.


Document Type: Research Article


Publication date: May 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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