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Graphene-based composite thin films for electronics.

Goki Eda1, Manish Chhowalla

  • 1Rutgers University, Materials Science and Engineering, Piscataway, New Jersey 08854, USA.

Nano Letters
|January 29, 2009
PubMed
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This study explores composite thin films made of functionalized graphene sheets (FGS) in polystyrene (PS). Larger FGS in these films enhance transistor mobility, paving the way for low-cost electronics.

Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Composite thin films offer tunable electrical properties.
  • Graphene-based materials are promising for advanced electronics.
  • Solution processing enables scalable fabrication.

Purpose of the Study:

  • To characterize the electrical properties of functionalized graphene sheet (FGS) and polystyrene (PS) composite thin films.
  • To investigate the influence of FGS size on transistor performance.
  • To assess the potential for low-cost, macro-scale electronic applications.

Main Methods:

  • Fabrication of composite thin films using solution processing.
  • Characterization of electrical properties using field-effect transistors.

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  • Analysis of device characteristics as a function of FGS size.

    • Main Results:

    • The composite thin films exhibited ambipolar field-effect characteristics.
    • Transport was attributed to percolation among FGS within the insulating PS matrix.
    • Devices utilizing larger FGS demonstrated significantly higher charge carrier mobility.

    Conclusions:

    • Functionalized graphene sheets in a polystyrene matrix form effective composite thin films for electronics.
    • The size of FGS is a critical parameter for optimizing charge carrier mobility.
    • This scalable fabrication method holds potential for developing cost-effective, large-area electronic devices.