Abstract
Flexible composites with negative permittivity have a very broad development prospect in flexible elec-tronics and wearable devices.Currently,how to control the negative permittivity except for from their intrinsic prop-erties of components is still a challenge.In this study,the negative permittivity and frequency dispersion were adjusted by changing the heat treatment temperature.Polyvinylidene fluoride(PVDF)was selected as the flexi-ble matrix and reduced graphene oxide(rGO)as the functional filler to prepare rGO/PVDF membranous com-posites.The negative permittivity was observed in rGO/PVDF composites film,and the effect of heat treatment temperature on the negative permittivity was further stud-ied.It indicated that a higher heat treatment temperature contributed to the formation of conductive network,so as to obtaining negative permittivity.When the molding temperature was 70 ℃,the negative permittivity spectrum conformed to the Drude model was only observed in the composites with 35 wt％content of rGO.After the heat treatment temperature reached 180 ℃,when the content of rGO decreased to 25 wt％,the composites film achieved negative permittivity(～-10),which had a low-fre-quency dispersion in the test frequency range.The negative permittivity of in composites can be regulated by adjusting the heat treatment temperature,which promotes the appli-cation and development of flexible metamaterials in underwater sensing and detection,etc.
维普
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