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Multiple pH-responsive graphene composites by non-covalent modification with chitosan.

Jiyang Liu1, Shaojun Guo, Lei Han

  • 1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.

Talanta
|November 20, 2012
PubMed
Summary

Researchers developed pH-sensitive graphene composites using chitosan. These materials, chitosan decorated graphene (CS-G) and cross-linked chitosan decorated graphene (CLCS-G), exhibit reversible switching between dispersed and aggregated states, enabling a novel pH-driven switch for monitoring pH changes.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Chemically converted graphene (CCG) and chitosan are functional materials with distinct pH-responsive properties.
  • Non-covalent functionalization offers a versatile route to combine these materials.
  • Understanding synergistic effects is key to developing advanced composite materials.

Purpose of the Study:

  • To synthesize and characterize pH-sensitive composites of chemically converted graphene (CCG) and chitosan.
  • To investigate the pH-responsive behavior and switching mechanisms of the developed composites.
  • To develop a stable and repeatable pH-driven switch for pH monitoring.

Main Methods:

  • Non-covalent functionalization of CCG with chitosan to form chitosan decorated graphene (CS-G).

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  • Controlled deposition and cross-linking of chitosan on CS-G to create cross-linked chitosan decorated graphene (CLCS-G).
  • Zeta potential analysis to elucidate pH response mechanisms.

    • Main Results:

    • CS-G exhibits dispersion in acidic and basic solutions, with aggregation near neutral pH.
    • CLCS-G shows dispersion exclusively in acidic solutions.
    • Both CS-G and CLCS-G demonstrate reversible pH-induced aggregation and dispersion.
    • A stable, repeatable pH-driven switch was successfully developed using CS-G's properties.

    Conclusions:

    • Synergistic interactions between chitosan and CCG yield unique pH-sensitive materials.
    • The developed composites offer tunable pH-responsive behaviors.
    • The pH-driven switch presents a promising application for real-time pH monitoring.