Intrinsic electrical properties of cable bacteria reveal an Arrhenius temperature dependence
| Autor: | Filip J. R. Meysman, Bart Cleuren, Silvia Hidalgo-Martinez, Mathijs Meert, Koen Wouters, Filippo Morini, Robin Bonné, Jean Manca, Jaco Vangronsveld, Rob Cornelissen, Jeroen Hustings, Ji-Ling Hou, Roland Valcke, Sofie Thijs |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Electron mobility
Materials science lcsh:Medicine 02 engineering and technology Activation energy Conductivity 010402 general chemistry Microbiology 01 natural sciences Article Electron Transport symbols.namesake Electrical resistivity and conductivity lcsh:Science Electrical conductor Arrhenius equation Multidisciplinary Physics lcsh:R Electric Conductivity Temperature 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy Semiconductors Chemical physics symbols lcsh:Q Charge carrier 0210 nano-technology Engineering sciences. Technology |
| Zdroj: | Scientific Reports, 10(1) Scientific Reports Scientific reports Scientific Reports, Vol 10, Iss 1, Pp 1-8 (2020) |
| ISSN: | 2045-2322 |
| Popis: | Filamentous cable bacteria exhibit long-range electron transport over centimetre-scale distances, which takes place in a parallel fibre structure with high electrical conductivity. Still, the underlying electron transport mechanism remains undisclosed. Here we determine the intrinsic electrical properties of the conductive fibres in cable bacteria from a material science perspective. Impedance spectroscopy provides an equivalent electrical circuit model, which demonstrates that dry cable bacteria filaments function as resistive biological wires. Temperature-dependent electrical characterization reveals that the conductivity can be described with an Arrhenius-type relation over a broad temperature range (- 195 degrees C to+50 degrees C), demonstrating that charge transport is thermally activated with a low activation energy of 40-50 meV. Furthermore, when cable bacterium filaments are utilized as the channel in a field-effect transistor, they show n-type transport suggesting that electrons are the charge carriers. Electron mobility values are similar to 0.1 cm(2)/Vs at room temperature and display a similar Arrhenius temperature dependence as conductivity. Overall, our results demonstrate that the intrinsic electrical properties of the conductive fibres in cable bacteria are comparable to synthetic organic semiconductor materials, and so they offer promising perspectives for both fundamental studies of biological electron transport as well as applications in microbial electrochemical technologies and bioelectronics. The authors thank the colleagues from X-LAB from Hasselt University and the Microbial Electricity team from the University of Antwerp for discussions and feedback. Special thanks to K. Ceyssens and T. Custers for the graphics in Fig. 1A; R. Lempens and M. De Roeve for help with the experimental set-up; J. D'Haen for SEM imaging (Fig. 1B). Graphics for Fig. 1C,D and Fig. 3A were made by RB with Adobe illustrator. This research was financially supported by the Research Foundation-Flanders (FWO project grant G031416N to FJRM and JM and FWO aspirant grant 1180517N to RB). FJRM was additionally supported by the Netherlands Organization for Scientific Research (VICI grant 016.VICI.170.072). Manca, JV (corresponding author), Hasselt Univ, X Lab, Agoralaan D, B-3590 Diepenbeek, Belgium. jean.manca@uhasselt.be |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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