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Photosensing System Using Photosystem I and Gold Nanoparticle on Graphene Field-Effect Transistor.

Daiki Nishiori1, Wenchao Zhu1, Raphaël Salles1

  • 1Department of Chemistry, School of Science , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku, Tokyo 113-0033 , Japan.

ACS Applied Materials & Interfaces
|October 19, 2019
PubMed
Summary

Researchers developed a novel light sensor using photosystem I (PSI) and a graphene field-effect transistor (FET). This biosensor detects light with high quantum yield under ambient conditions, paving the way for advanced optoelectronic devices.

Keywords:
field-effect transistorgold nanoparticlegraphenephotosensorphotosystem

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Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Photosystem I (PSI) is a crucial protein complex in photosynthesis.
  • Graphene field-effect transistors (FETs) offer unique electronic properties for sensing applications.
  • Integrating biological components with electronic devices is a growing area of research.

Purpose of the Study:

  • To fabricate and characterize a novel light sensor based on PSI and a graphene FET.
  • To investigate the photoresponse and sensing mechanism of the PSI-graphene FET system.
  • To explore the role of surface-active agents in optimizing sensor performance.

Main Methods:

  • Immobilization of PSI onto a graphene FET using gold nanoparticles (AuNPs).
  • Measurement of current-voltage (I-V) characteristics before and after light irradiation.
  • Analysis of charge neutrality point shifts and photoresponsivity.

Main Results:

  • The PSI-graphene FET exhibited a photoresponsivity of 4.8 × 10^2 A W^-1.
  • A negative shift of -12 mV in the graphene's charge neutrality point was observed upon illumination.
  • Photoresponses were dependent on the presence of specific surface-active agents creating a hydrophobic environment.

Conclusions:

  • This study presents the first protein-based photosensing system integrated with a solution-gated graphene FET.
  • The observed sensing mechanism involves electron transfer between AuNPs and PSI, influencing graphene's charge carriers.
  • Surface-active agents are critical for enabling efficient light detection by modifying the graphene surface and electrolyte interactions.