The positive piezoconductive effect in graphene

Kang Xu, Ke Wang, Wei Zhao, Wenzhong Bao, Erfu Liu, Yafei Ren, Miao Wang, Yajun Fu, Junwen Zeng, Zhaoguo Li, Wei Zhou, Fengqi Song, Xinran Wang, Yi Shi, Xiangang Wan, Michael S. Fuhrer, Baigeng Wang (), Zhenhua Qiao (), Feng Miao () and Dingyu Xing
Additional contact information
Kang Xu: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Ke Wang: ICQD, Hefei National Laboratory for Physical Sciences at Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China
Wei Zhao: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Wenzhong Bao: University of Maryland
Erfu Liu: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Yafei Ren: ICQD, Hefei National Laboratory for Physical Sciences at Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China
Miao Wang: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Yajun Fu: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Junwen Zeng: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Zhaoguo Li: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Wei Zhou: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Fengqi Song: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Xinran Wang: School of Electronic Science and Engineering, Nanjing University
Yi Shi: School of Electronic Science and Engineering, Nanjing University
Xiangang Wan: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Michael S. Fuhrer: University of Maryland
Baigeng Wang: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Zhenhua Qiao: ICQD, Hefei National Laboratory for Physical Sciences at Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China
Feng Miao: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Dingyu Xing: National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract As the thinnest conductive and elastic material, graphene is expected to play a crucial role in post-Moore era. Besides applications on electronic devices, graphene has shown great potential for nano-electromechanical systems. While interlayer interactions play a key role in modifying the electronic structures of layered materials, no attention has been given to their impact on electromechanical properties. Here we report the positive piezoconductive effect observed in suspended bi- and multi-layer graphene. The effect is highly layer number dependent and shows the most pronounced response for tri-layer graphene. The effect, and its dependence on the layer number, can be understood as resulting from the strain-induced competition between interlayer coupling and intralayer transport, as confirmed by the numerical calculations based on the non-equilibrium Green’s function method. Our results enrich the understanding of graphene and point to layer number as a powerful tool for tuning the electromechanical properties of graphene for future applications.

Date: 2015
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DOI: 10.1038/ncomms9119

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