Negative permittivity of reduced graphene oxide/polyvinylidene fluoride membranous composites adjusted by heat treatment  

作　　者：Kai Sun Min-Hui Zhao Peng-Tao Yang Min Chen Qing Hou Wen-Xin Duan Run-Hua Fan 

机构地区：[1]College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China [2]School of Civil Engineering,Shandong Jiaotong University,Jinan250357,China [3]Institute of Photonic Chips,University of Shanghai for Science and Technology,Shanghai 200093,China

出　　处：《Rare Metals》2024年第11期5964-5974,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52101178 and 52271182);the Natural Science Foundation of Shanghai(No.22ZR1426800);the Young Elite Scientist Sponsorship Program by China Association for Science and Technology(No.YESS20200257);Shanghai Pujiang Program(No.22PJ1411300);the Innovation Program of Shanghai Municipal Education Commission(No.2019-01-07-00-10-E00053);the Natural Science Foundation of Shandong Province(No.ZR2021QE090)。

摘　　要：Flexible composites with negative permittivity have a very broad development prospect in flexible electronics and wearable devices.Currently,how to control the negative permittivity except for from their intrinsic properties 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 flexible matrix and reduced graphene oxide(rGO)as the functional filler to prepare rGO/PVDF membranous composites.The negative permittivity was observed in rGO/PVDF composites film,and the effect of heat treatment temperature on the negative permittivity was further studied.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-frequency dispersion in the test frequency range.The negative permittivity of in composites can be regulated by adjusting the heat treatment temperature,which promotes the application and development of flexible metamaterials in underwater sensing and detection,etc.

关 键 词：Flexible composites Negative permittivity Heat treatment METAMATERIAL 

分 类 号：TB332[一般工业技术—材料科学与工程]