Leung KM, Wanger G, El-Naggar M, Gorby Y, Southam G, Lau WM, Yang J
Shewanella Oneidensis MR-1 Bacterial Nanowires Exhibit P-type, Tunable Electronic Behaviour.
Nano Letters. 2013 May 23;
The study of electrical transport in biomolecular materials is critical to our fundamental understanding of physiology and to the development of practical bioelectronics applications. In this study, we investigated the electronic transport characteristics of Shewanella oneidensis MR-1 nanowires by conducting-probe atomic force microscopy (CP-AFM) and by constructing field-effect transistors (FETs) based on individual Shewanella nanowires. Here we show that Shewanella nanowires exhibit p-type, tunable electronic behaviour with a field-effect mobility on the order of 10(-1) cm(2)/Vs, comparable to devices based on synthetic organic semiconductors. This study opens up opportunities to use such bacterial nanowires as a new semiconducting biomaterial for making bioelectronics, and to enhance the power output of microbial fuel cells through engineering the interfaces between metallic electrodes and bacterial nanowires.