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(a) ZnO NWs grown on the surface of a PVDF/PVDF-TrFE fiber. (b) NPs in a piezoelectric fiber of PVDF/PVDF-TrFE. (c) Only charges making direct contact with the electrode of an electrospun fiber are used. (d) Conductive NPs increase the horizontal flow and more charges can be used. (e) Addition of too many conductive NPs increases volume conductivity and can short the PENG.
