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Updated: May 22, 2026

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Graphene-based waveguides: novel method for detecting biological activity.

Jangah Kim1, Manasi Kasture, Taihyun Hwang

  • 1Sungkyunkwan Advanced Institute of Technology-SAINT, Sungkyunkwan University, Suwon 440746, South Korea.

Applied Biochemistry and Biotechnology
|May 10, 2012
PubMed
Summary
This summary is machine-generated.

This study presents a novel graphene-coupled polydimethylsiloxane (PDMS) waveguide biosensor. The sensor detects analytes by monitoring changes in graphene

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Area of Science:

  • Materials Science
  • Biotechnology
  • Optoelectronics

Background:

  • Biosensors are crucial for detecting chemical and biological species.
  • Optical waveguides offer sensitive platforms for biosensing applications.
  • Graphene's unique electrical properties make it suitable for sensitive detection.

Purpose of the Study:

  • To fabricate and characterize a novel biosensor combining graphene and a polydimethylsiloxane (PDMS) waveguide.
  • To investigate the sensor's response to bioanalytes based on evanescent wave principles.
  • To evaluate the sensor's performance under visible light illumination.

Main Methods:

  • Fabrication of a graphene-coupled PDMS optical waveguide.
  • Utilizing the principle of local evanescent graphene-coupled wave sensing.
  • Monitoring changes in graphene's electrical properties (photocurrent) under varying conditions.
  • Testing sensor sensitivity to different visible light wavelengths (blue, green, red).

Main Results:

  • The fabricated biosensor demonstrated sensitivity to the presence of bioanalytes.
  • Evanescent field shifts, indicative of analyte presence, were observed.
  • Changes in photocurrent of the graphene film were correlated with bioanalyte detection.
  • The sensor showed sensitivity to visible light, with photocurrent variations observed for blue, green, and red light.

Conclusions:

  • The graphene-coupled PDMS optical waveguide functions as an effective biosensor.
  • The sensor leverages evanescent wave principles for analyte detection.
  • The device exhibits sensitivity to visible light, opening possibilities for optical-based biosensing.