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Laser-Induced Graphene Dual Optical/Electrochemical Platform for In-Chip Sensing Applications.

Bengisu D Gok1, Nuno F Santos1, Sónia O Pereira1

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Summary
This summary is machine-generated.

This study presents a novel dual laser-induced graphene (LIG) sensor combining optical and electrochemical methods for point-of-care diagnostics. The LIG sensor demonstrates simultaneous on-time detection, advancing accessible biosensing platforms.

Keywords:
electrochemicallaser-induced grapheneopticalpoint-of-caresensors

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Biomedical Engineering

Background:

  • Laser-induced graphene (LIG) is a promising material for next-generation diagnostic devices.
  • There is a growing demand for effective and accessible biosensing platforms for point-of-care (POC) applications.
  • Combining optical and electrochemical transduction offers enhanced sensing capabilities.

Purpose of the Study:

  • To develop and characterize an in-chip LIG-based sensor integrating optical and electrochemical transduction.
  • To investigate the impact of LIG fabrication parameters (laser exposures) on sensor performance.
  • To demonstrate the sensor's potential for simultaneous dual-mode detection in POC settings.

Main Methods:

  • Fabrication of LIG electrodes with varying laser exposures.
  • Characterization of LIG morphology, graphitization, defects, and electrical resistance.
  • Validation using ferrocyanide as a redox probe and DCM as a model dye for electrochemical and optical sensing, respectively.
  • Demonstration of simultaneous optical and electrochemical detection of ferrocyanide electro-oxidation.

Main Results:

  • LIG electrode properties were correlated with electrochemical and optical sensing performance.
  • The dual sensor successfully performed simultaneous on-time detection and analysis.
  • Ferrocyanide electro-oxidation was effectively monitored using both optical and electrochemical signals.
  • The sensor demonstrated robust performance for dual-mode POC applications.

Conclusions:

  • The developed in-chip LIG sensor effectively integrates optical and electrochemical transduction for POC devices.
  • This dual-mode sensing approach enhances detection capabilities for biosensing applications.
  • The study highlights the potential of LIG-based sensors for advanced, accessible diagnostics.