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Synthesis, Assembly, and Characterization of Monolayer Protected Gold Nanoparticle Films for Protein Monolayer Electrochemistry
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Published on: October 4, 2011

Proteins as electronic materials: electron transport through solid-state protein monolayer junctions.

Izhar Ron1, Lior Sepunaru, Stella Itzhakov

  • 1Departments of Materials and Interfaces, Weizmann Institute of Science, POB 26, Rehovot 76100, Israel.

Journal of the American Chemical Society
|March 10, 2010
PubMed
Summary

Researchers created large-area protein monolayers on silicon for electronic studies. Proteins like azurin and bacteriorhodopsin showed efficient electron transport, suggesting biomolecules can be used in electronic devices.

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Published on: December 2, 2011

Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Electron transfer (ET) is crucial in biochemistry, typically studied in aqueous solutions.
  • Integrating proteins into solid-state junctions allows investigation of their electronic conductance.
  • Previous studies often used single molecules and scanning probe techniques.

Purpose of the Study:

  • To develop a high-yield, reproducible method for preparing large-area protein monolayer junctions.
  • To investigate the electronic transport properties of different protein types in solid-state devices.
  • To explore the potential of proteins as components in electronic devices.

Main Methods:

  • Assembly of large-area monolayer junctions of azurin (Az), bacteriorhodopsin (bR), and bovine serum albumin (BSA) on a silicon platform.
  • Utilizing appropriate top electrodes for reproducible electrical current measurements.
  • Conducting current-voltage (I-V) measurements on the protein monolayer junctions.

Main Results:

  • Achieved reproducible electrical measurements on large-area protein monolayers (Az, bR, BSA).
  • Observed relatively minor differences in current-voltage characteristics between Az and bR.
  • Demonstrated more efficient electron transport (ETp) through Az and bR compared to BSA, and even BSA showed higher current than C18 alkyl chains.
  • Confirmed that proteins maintained their native conformation within the junctions.

Conclusions:

  • Proteins can be integrated into solid-state junctions for electronic measurements.
  • Electron transport through protein monolayers is efficient and suggests novel transport mechanisms.
  • Biomolecules like proteins show promise as functional elements in solid-state electronic devices.