Theoretical study on two-dimensional MoS2 piezoelectric nanogenerators
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- 作者：Yongli Zhou ; Wei Liu ; Xin Huang ; Aihua Zhang ; Yan Zhang ; Zhong Lin Wang
- 关键词：piezoelectric nanogenerator ; MoS2 ; two ; dimensional ; mechanical ; electrical energy conversion ; high ; frequency application
- 刊名：Nano Research
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：9
- 期：3
- 页码：800-807
- 全文大小：1,489 KB
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Wei Liu (1)
Xin Huang (1)
Aihua Zhang (1)
Yan Zhang (2)
Zhong Lin Wang (1) (3)
1. Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China
2. Institute of Theoretical Physics, and Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, China
3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chinese Library of Science
Chemistry
Nanotechnology - 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
- ISSN：1998-0000
文摘
Recent experiments have demonstrated that nanogenerators fabricated using two-dimensional MoS2 flakes may find potential applications in electromechanical sensing, wearable technology, pervasive computing, and implanted devices. In the present study, we theoretically examined the effect of the number of atomic layers in MoS2 flakes on the nanogenerator output. Under a square-wave applied strain, MoS2 flakes with an even number of atomic layers did not exhibit a piezoelectric output, owing to the presence of a projected inversion symmetry. On the other hand, for MoS2 flakes with an odd number of layers, owing to the lack of inversion symmetry, piezoelectric output voltage and current were generated, and decreased with the increase of the number of layers. Furthermore, as MoS2 flakes were only a few atoms thick, the capacitance of the MoS2 nanogenerators was at least an order of magnitude smaller than that of the nanowire- and nanofilm-based nanogenerators, enabling the use of MoS2 nanogenerators in high-frequency applications. Our results explain the experimental observations and provide guidance on optimizing and designing two-dimensional nanogenerators.