Cable bacteria as long-range biological semiconductors
Abstract
Filamentous cable bacteria exhibit unprecedented long-range biological electron transport, which takes place in a parallel fibre structure that shows an extraordinary electrical conductivity for a biological material. Still, the underlying electron transport mechanism remains undisclosed. Here we determine the intrinsic electrical properties of individual cable bacterium filaments. We retrieve an equivalent electrical circuit model, characterising cable bacteria as resistive biological wires. Temperature dependent experiments reveal that the charge transport is thermally activated, and can be described with an Arrhenius-type relation over a broad temperature range (-196{\deg}C to +50{\deg}C), thus excluding metal-like electron transport. Furthermore, when cable bacterium filaments are utilized as the channel in a field-effect transistor, they show n-type transport, indicating that electrons rather than holes are the charge carriers. Electron mobilities are in the order of 10 cm/Vs, comparable to many organic semiconductors. This new type of biological centimetre-range semiconductor with low resistivity offers new perspectives for both fundamental studies and applications in (bio)electronics.
Keywords
Cite
@article{arxiv.1912.06224,
title = {Cable bacteria as long-range biological semiconductors},
author = {Robin Bonné and Ji-Ling Hou and Jeroen Hustings and Mathijs Meert and Silvia Hidalgo-Martinez and Rob Cornelissen and Jan D'Haen and Sofie Thijs and Jaco Vangronsveld and Roland Valcke and Bart Cleuren and Filip J. R. Meysman and Jean V. Manca},
journal= {arXiv preprint arXiv:1912.06224},
year = {2019}
}
Comments
19 pages, including supplementary information