Treefrog Toe Pad-Inspired Micropatterning for High-Power Triboelectric Nanogenerator

Van Tien Bui, Qitao Zhou, Jong Nam Kim, Jung Hwan Oh, Kwan Woo Han, Ho Suk Choi, Sang Woo Kim, Il Kwon Oh

Research output: Contribution to journalArticlepeer-review


Inspired by treefrog's toe pads that show superior frictional properties, herein, an industrially compatible approach is reported to make an efficient dielectric tribosurface design using customizable nonclose-packed microbead arrays, mimicking the friction pads of treefrogs, in order to significantly enhance electrification performance and reliability of triboelectric nanogenerator (TENG). The approach involves using an engineering polymer to prepare a highly ordered large-area concave film, and subsequently the molding of a convex patterned triboreplica in which the concave film is exploited as a reusable master mold. A nature-inspired TENG based on the patterned polydimethylsiloxane (PDMS) paired with flat aluminum (Al) can generate a relatively high power density of 8.1 W m−2 even if a very small force of ≈6.5 N is applied. Moreover, the convex patterned PDMS-based TENG possesses exceptional durability and reliability over 25 000 cycles of contact–separation. Considering the significant improvements in power generation of TENG; particularly at very small force, together with cost-effectiveness and possibility of mass production, the present methodology may pave the way for large-scale blue energy harvesting and commercialization of TENGs for many practical applications.

Original languageEnglish
Article number1901638
JournalAdvanced Functional Materials
Issue number28
Publication statusPublished - 2019 Jul 11

Bibliographical note

Funding Information:
This work was supported by the Creative Research Initiative Program (2015R1A3A2028975), funded by the National Research Foundation of Korea (NRF). This work was supported by the Defense Acquisition Program Administration and the Agency for Defense Development in Korea under the contract UD170023DD.

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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