Tunable piezoelectric nanogenerators using flexoelectricity of well-ordered hollow 2D MoS2 shells arrays for energy harvesting

Jin Kyu Han, Sungho Kim, Seunghun Jang, Yi Rang Lim, Sang Woo Kim, Hyunju Chang, Wooseok Song, Sun Sook Lee, Jongsun Lim, Ki Seok An, Sung Myung

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Piezoelectric two-dimensional (2D) transition-metal dichalcogenides such as molybdenum disulfide (MoS2) have recently attracted significant attention owing to their applicability for fabrication of flexible power generators. In this study, novel piezoelectric nanogenerators (PNGs) consisting of 2D piezoelectric MoS2 shells are fabricated where an Al2O3 thin layer deposited on the surface of polystyrene (PS) beads is used to avoid collapse of the spherical MoS2 shells under the high growth temperature. In addition, the MoS2 shell size is controlled by adjusting the PS bead size and the effects of the MoS2 shell size on power generation characteristics are investigated. Our PNG based on the piezoelectric MoS2 shells produces a peak output voltage of approximately 1.2 V at a pressure of 4.2 kPa. The minimum pressure for power generation by tapping is 0.3 kPa. This novel method is very promising for development of the next-generation PNGs based on 2D semiconductor piezoelectric materials.

Original languageEnglish
Pages (from-to)471-477
Number of pages7
JournalNano Energy
Publication statusPublished - 2019 Jul

Bibliographical note

Funding Information:
J.K.H and S.H.K contributed equally to this work. This research was supported by a grant ( 2011-0031636 ) from the Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Science, ICT and Future Planning, Korea . This research was also supported by Multi-Ministry Collaborative R&D Program through the National Research Foundation of Korea (NRF) funded by KNPA, MSIT, MOTIE, ME, NFA ( NRF-2017M3D9A1073502 ).

Publisher Copyright:
© 2019 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering


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