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Related Experiment Video

Updated: Feb 22, 2026

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Graphene Quantum Dots Electrochemistry and Sensitive Electrocatalytic Glucose Sensor Development.

Sanju Gupta1, Tyler Smith2, Alexander Banaszak3,4

  • 1Department of Physics and Astronomy and Biotechnology Center, Western Kentucky University, 1906 College Heights Blvd, Bowling Green, KY 42101, USA. sanju.gupta@wku.edu.

Nanomaterials (Basel, Switzerland)
|September 30, 2017
PubMed
Summary

Graphene quantum dots (GQDs) show promise for electrochemical biosensors, enabling sensitive glucose detection. These nanomaterials offer efficient electron transfer for improved performance in medical and bio-nanotechnology applications.

Keywords:
biosensingelectrochemistryglucose oxidasegraphene quantum dotshydrothermal

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Area of Science:

  • Nanomaterials Science
  • Electrochemistry
  • Biosensing Technology

Background:

  • Graphene quantum dots (GQDs) are zero-dimensional nanomaterials with unique quantum confinement and edge effects.
  • Their physicochemical properties stem from a sp²-bonded carbon nanocore and functional edge groups.
  • GQDs exhibit potential in both fundamental electrochemistry and applied biosensing.

Purpose of the Study:

  • To synthesize GQDs using solvothermal and hydrothermal methods.
  • To characterize GQD properties including size, electronic band structure, and electrochemical behavior.
  • To develop and evaluate an enzyme-based glucose biosensor utilizing GQDs.

Main Methods:

  • GQD synthesis via solvothermal and hydrothermal techniques.
  • Characterization using high-resolution transmission electron microscopy, UV-Vis absorption, and fluorescence spectroscopy.
  • Electrochemical analysis including cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy.

Main Results:

  • Optimally sized 5 nm GQDs were synthesized with blue-violet electronic band signatures.
  • GQDs demonstrated efficient direct electron transfer and electrocatalytic activity for glucose oxidase (GOx).
  • The developed GOx-GQD biosensor exhibited a linear response to glucose (10 μM–3 mM) with a low limit of detection (1.35 μM).

Conclusions:

  • GQDs offer superior performance and stability for biosensing compared to other graphene-based materials.
  • Their properties, including high surface-to-volume ratio and biocompatibility, facilitate rapid charge transfer.
  • GQD-based electrochemical platforms hold significant potential for medical diagnostics and bio-nanotechnology.