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Exploring Interfacial Graphene Oxide Reduction by Liquid Metals: Application in Selective Biosensing.

Mahroo Baharfar1, Mohannad Mayyas1, Mohammad Rahbar2

  • 1School of Chemical Engineering, University of New South Wales (UNSW), Sydney, New South Wales 2052, Australia.

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|November 16, 2021
PubMed
Summary

Liquid metals and graphene oxide create a novel composite for advanced electrochemical sensing. This material enhances selectivity for dopamine detection, paving the way for improved biosensors.

Keywords:
dopamineelectrochemical biosensingelectrochemical paper-based analytical devicesgraphene oxideliquid metalsnanoarchitectonics

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Liquid metals (LMs) exhibit unique interfacial properties beneficial for chemical reactions and nanoarchitectonics.
  • Graphene oxide (GO) is a versatile material with potential for various applications, including electrochemical sensing.

Purpose of the Study:

  • To investigate the interfacial interaction between eutectic gallium-indium (EGaIn) liquid metal and graphene oxide (GO).
  • To develop a novel composite material (LM-rGO) for enhanced electrochemical sensing applications, specifically for dopamine detection.

Main Methods:

  • Utilized NanoIR surface mapping to analyze the reduction of GO by EGaIn.
  • Synthesized a composite of reduced GO sheets assembled on LM microdroplets (LM-rGO).
  • Developed and tested paper-based electrodes modified with the LM-rGO composite for electrochemical sensing.

Main Results:

  • Demonstrated successful reduction of GO, evidenced by the removal of carbonyl groups via NanoIR mapping.
  • The LM-rGO composite exhibited modified electrochemical interfaces due to Ga3+ coordination, enabling selective dopamine sensing.
  • The LM-rGO composite showed compatibility with low-cost paper-based electrode technologies.

Conclusions:

  • The interfacial interaction between LMs and GO leads to effective functional materials.
  • The LM-rGO composite demonstrates significant potential as an electrode modifier for selective electrochemical sensing.
  • This work opens avenues for developing advanced biosensors using LM-based nanomaterials.