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Preparation of ZnO Nanorod/Graphene/ZnO Nanorod Epitaxial Double Heterostructure for Piezoelectrical Nanogenerator by Using Preheating Hydrothermal
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The positive piezoconductive effect in graphene.

Kang Xu1, Ke Wang2,3, Wei Zhao1

  • 1National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

Nature Communications
|September 12, 2015
PubMed
Summary

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Graphene

Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Graphene, a 2D material, is crucial for post-Moore electronics and nano-electromechanical systems.
  • Interlayer interactions significantly alter electronic structures but their electromechanical impact is unexplored.

Purpose of the Study:

  • Investigate the electromechanical properties of suspended bi- and multi-layer graphene.
  • Understand the influence of layer number on piezoconductivity.

Main Methods:

  • Experimental observation of the piezoconductive effect in suspended graphene.
  • Numerical calculations using the non-equilibrium Green's function (NEGF) method.

Main Results:

  • A positive piezoconductive effect was observed in bi- and multi-layer graphene.

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  • The effect is layer-number dependent, peaking in tri-layer graphene.
  • Strain-induced competition between interlayer coupling and intralayer transport explains the phenomenon.

    • Conclusions:

    • Layer number is a critical factor for tuning graphene's electromechanical properties.
    • This finding offers new avenues for graphene-based device applications.
    • The study deepens the understanding of graphene's electromechanical behavior.