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Long-Range Tunneling Processes across Ferritin-Based Junctions.

Karuppannan Senthil Kumar1, Rupali Reddy Pasula2, Sierin Lim2,3

  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
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Researchers investigated charge transport through ferritin monolayers. By altering iron content, they controlled transport mechanisms like tunneling and hopping, highlighting ferritin

Keywords:
EGaInbiomolecular electronicsferritinlong-range charge transporttunneling junctions

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Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Long-range charge transport is crucial for molecular electronics.
  • Controlling charge transport mechanisms at the molecular level remains a challenge.

Purpose of the Study:

  • To investigate the mechanism of long-range charge transport across tunneling junctions using ferritin monolayers.
  • To determine if ferritin's iron content can modulate charge transport pathways.

Main Methods:

  • Fabrication of tunneling junctions with ferritin monolayers.
  • Systematic variation of iron (Fe) content within ferritin proteins.
  • Electrical characterization to probe charge transport mechanisms.

Main Results:

  • Demonstrated that charge transport mechanism is tunable by adjusting internal iron levels.
  • Identified switching between coherent tunneling, sequential tunneling, and hopping transport.
  • Ferritin monolayers exhibit controllable charge transport properties.

Conclusions:

  • Ferritin is a versatile biomolecule for controlling charge transport.
  • Iron content in ferritin acts as a switch for different transport mechanisms.
  • Opens possibilities for bio-based molecular electronic components.