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Charge Injection and Interfiber Electrical Conduction in Cable Bacteria.

Cosimo Tommasi1, Anastasia Gerzhik2,3, Sebastian Heinzmann1

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Summary
This summary is machine-generated.

Charge transfer between cable bacteria fibers is possible, enabling bioelectronics. This study reveals charge injection into conductive fibers relies on the same mechanism as transport along them.

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Area of Science:

  • Microbiology
  • Biophysics
  • Bioelectronics

Background:

  • Cable bacteria are multicellular microorganisms with conductive fibers enabling long-distance charge transport.
  • Understanding charge injection is crucial for their application in biobased electronics.

Purpose of the Study:

  • To investigate the charge injection mechanism into cable bacteria conductive fibers.
  • To isolate and characterize charge transfer between contacting bacterial filaments.

Main Methods:

  • Fabrication of "crosses" using native bacteria or extracted fiber skeletons.
  • Probing charge transport through individual filaments and cross-cable configurations.
  • Temperature-dependent characterization from 300 K down to 50 K.

Main Results:

  • Charge transfer between contacting cable bacterium fibers is feasible, though with increased resistance.
  • Thermally activated Arrhenius behavior was observed for both single filaments and cross-conduction.
  • Activation energy for filament-to-filament transport (15–40 meV) was slightly lower than for individual filaments.

Conclusions:

  • Charge injection into cable bacterium fibers utilizes the same mechanism as charge transport along them.
  • A structural model proposes internally winding conductive channels within a protein matrix, enabling external electrical contact.