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(a) The volume and surface conductivities of polyvinylidene fluoride (PVDF)/multiwalled-carbon nanotubes (MWCNTs) nanofiber mats for different concentrations of MWCNTs dosages; (b) schematic diagram of PVDF/MWCNTs nanogenerator without stress; (c) working schematic of the PVDF-3% CNTs and PVDF-5% CNTs nanogenerators under stress; (d) working schematic of the PVDF-7% CNTs and PVDF-10% CNTs nanogenerators under stress. Reprinted with permission from [119].
