The preparation of ferroelectric polymer–metallic nanowire composite nanofiber triboelectric layers is described for use in high-performance triboelectric nanogenerators (TENGs). The electrospun polyvinylidene fluoride (PVDF)–silver nanowire (AgNW) composite and nylon nanofibers are utilized in the TENGs as the top and bottom triboelectric layers, respectively. The electrospinning process facilitates uniaxial stretching of the polymer chains, which enhances the formation of the highly oriented crystalline β-phase that forms the most polar crystalline phase of PVDF. The addition of AgNWs further promotes the β-phase crystal formation by introducing electrostatic interactions between the surface charges of the nanowires and the dipoles of the PVDF chains. The extent of β-phase formation and the resulting variations in the surface charge potential upon the addition of nanowires are systematically analyzed using X-ray diffraction (XRD) and Kelvin probe force microscopy techniques. The ability of trapping the induced tribocharges increases upon the addition of nanowires to the PVDF matrix. The enhanced surface charge potential and the charge trapping capabilities of the PVDF–AgNW composite nanofibers significantly enhance the TENG output performances. Finally, the mechanical stability of the electrospun nanofibers is dramatically enhanced while maintaining the TENG performances by applying thermal welding near the melting temperature of PVDF.
Bibliographical noteFunding Information:
S.C. and H.K. contributed equally to this work. This work was financially supported by a grant from the Korea Institute of Industrial Technology as“Development of smart textronic products based on electronic fibers and textiles” (kitech JA-17-0045) and the Center for Advanced Soft Electronics (CASE) under the Global Frontier Research Program (NRF-2013M3A6A5073177), Korea. J. Y. Lee was financially supported by Basic Research Science Program through the National Research Foundation of Korea (NRF) grants funded by Korean Government (MSIP) (2014M3A7B4052200), Korea.
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics