Single-metalloprotein wet biotransistor

Alessandrini, Andrea; Salerno, Marco; Frabboni, Stefano; Facci, Paolo
March 2005
Applied Physics Letters;3/28/2005, Vol. 86 Issue 13, p133902
Academic Journal
Metalloproteins are redox molecules naturally shuttling electrons with high efficiency between molecular partners. As such, they are candidates of choice for bioelectronics. In this work, we have used bacterial metalloprotein azurin, hosted in a nanometer gap between two electrically biased gold electrodes, to demonstrate an electrochemically gated single-molecule transistor operating in an aqueous environment. Gold-chemisorbed azurin shows peaks in tunneling current upon changing electrode potential and a related variation in tunneling barrier transparency which can be exploited to switch an electron current through it. These results suggest the wet approach to molecular electronics as a viable method for exploiting electron transfer of highly specialized biomolecules.


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