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Related Experiment Video

Updated: Feb 26, 2026

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Laser-Scribed Graphene Electrodes for Aptamer-Based Biosensing.

Christoph Fenzl1, Pranati Nayak2, Thomas Hirsch1

  • 1Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg , Universitaetsstrasse 31, 93053 Regensburg, Germany.

ACS Sensors
|July 21, 2017
PubMed
Summary
This summary is machine-generated.

Laser-scribed graphene (LSG) electrodes offer sensitive biosensing for point-of-care diagnostics. This study demonstrates LSG biosensors for detecting thrombin in serum with high reliability and low detection limits.

Keywords:
aptamerbiosensorcarbon nanomaterialelectrochemistryimmobilizationlaser-scribed graphene

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Area of Science:

  • Materials Science
  • Biotechnology
  • Analytical Chemistry

Background:

  • Graphene exhibits excellent potential as a transducer material for advanced sensing applications.
  • Miniaturized, all-carbon point-of-care devices are a significant goal in diagnostics.

Purpose of the Study:

  • To demonstrate laser-scribed graphene (LSG) electrodes as sensitive and reliable biosensor transducers.
  • To develop an all-carbon biosensor for blood serum analysis.

Main Methods:

  • Fabrication of flexible LSG electrodes with large electrochemical surface areas via a direct-write laser process on polyimide.
  • A universal immobilization strategy using 1-pyrenebutyric acid to anchor aptamers against thrombin.
  • Electrochemical detection of thrombin in buffer and human serum.

Main Results:

  • LSG electrodes exhibited high sensitivity and reliability for biosensing.
  • The developed biosensor achieved extremely low detection limits for thrombin.
  • Detection limits were 1 pM in buffer and 5 pM in complex serum matrix.

Conclusions:

  • LSG electrodes are a promising transducer material for integrated, miniaturized biosensing devices.
  • The developed immobilization approach is effective for creating high-performance biosensors.
  • This work advances the potential for all-carbon point-of-care diagnostic tools.