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Substrate-induced solvent intercalation for stable graphene doping.

Hyun Ho Kim1, Jae Won Yang, Sae Byeok Jo

  • 1Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.

ACS Nano
|February 2, 2013
PubMed
Summary

A simple dipping method introduces chloroform (CF) solvent between graphene and SiO₂ substrates, creating stable intercalated clusters. This process offers a controllable method for doping graphene, crucial for flexible electronics.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Monolayer graphene exhibits unique electronic properties influenced by its interface with substrates.
  • Controlling graphene's electronic state is essential for advanced electronic applications.
  • Organic solvent interactions at interfaces are not fully understood.

Purpose of the Study:

  • To investigate substrate-induced intercalation of organic solvents at the graphene interface.
  • To understand the mechanism and stability of solvent intercalation.
  • To explore graphene doping using this phenomenon for flexible electronics.

Main Methods:

  • Chemical vapor deposition (CVD) for graphene synthesis.
  • Substrate immersion in chloroform (CF) for intercalation.

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  • Microscopic and spectroscopic analysis for observation.
  • Conductance measurements with Arrhenius plots for desorption energy.
  • Density Functional Theory (DFT) for theoretical calculations.

    • Main Results:

    • Spontaneous formation of stable CF clusters at the graphene/SiO₂ interface and within wrinkles.
    • Observed p-doping of monolayer graphene due to CF adsorption.
    • High desorption energies (70 and 370 meV) indicating stable intercalation.
    • DFT calculations confirm strong intercalation energy.
    • Stable doping maintained for over 40 days under ambient conditions.

    Conclusions:

    • Substrate-induced solvent intercalation is a viable method for stable graphene doping.
    • The phenomenon offers a facile, sustainable, and controllable approach for large-area graphene functionalization.
    • This method has potential applications in printed flexible electronics.