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a Triboelectric characteristic of P(VDF-TrFE) after poling with opposite bias. b Charge transfer from P(VDF-TrFE) surface by rubbing AFM tip. c Controlling triboelectric output voltage of P(VDF-TrFE) with different ferroelectric polarizations
(Reproduced from [42] with copyright permission from 2016 John Wiley & Sons)
