对负离子对氧化石墨烯/聚苯胺电磁性能的影响  

Effect of counter anions on the electromagnetic properties of graphene oxide/polyaniline

作　　者：刘佳 段玉平[1] 庞慧芳[1] 黄灵玺 LIU Jia;DUAN Yuping;PANG Huifang;HUANG Lingxi(Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,Liaoning,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁省凝固控制与数字化制备技术重点实验室,辽宁大连116085

出　　处：《精细化工》2021年第9期1779-1784,1790,共7页Fine Chemicals

基　　金：国家自然科学基金(52071053,U1704253);国家重点研发计划(2017YFB0703103)。

摘　　要：以过硫酸铵为引发剂,控制掺杂质子浓度为1 mol/L,分别以Cl^(–)、CSA^(–)(樟脑磺酸根)和SO_(4)^(2–)为对负离子,通过原位化学氧化聚合法制备得到掺杂态氧化石墨烯/聚苯胺复合材料。采用SEM、FTIR和XRD对复合材料进行形貌和结构表征,采用四探针法、矢量网络分析仪分别测试复合材料的电磁参数,并计算材料的阻抗和反射损耗(RL)。结果表明,3种复合材料均呈现聚苯胺纳米椎体包覆氧化石墨烯片层的三明治形貌。对负离子为SO_(4)^(2–)时,复合物的电导率最高为5.500S/cm,同时介电损耗能力最强。而樟脑磺酸掺杂复合物的驻波比在14.2 GHz处可达到1.1,更接近行波状态,具有最佳阻抗匹配性能。其最佳反射损耗为–30 dB(9.93 GHz,2.75 mm),有效吸波频宽(RL <–10 dB的频率范围)最高可至4.85 GHz(12.30~17.15 GHz,2 mm)。Graphene oxide/polyaniline composites were synthesized by in-situ chemical oxidation polymerization using ammonium persulfate as initiator, controlling the concentration of doped protons to 1 mol/L, using Cl^(–), CSA^(–)(camphorsulfonic anion group) and SO_(4)^(2–) as counter anions, respectively. SEM, FTIR and XRD were conducted to characterize the morphologies and structures, four-probe method and vector network analyzer were employed to determine the electromagnetic parameters. The impedance and reflection loss(RL) were calculated. The results indicated that the three types of composites all showed the sandwich-like morphology of graphene oxide layer coated by polyaniline nanocones. The SO_(4)^(2–) doping composite had the highest conductivity of 5.500 S/cm and the highest dielectric loss capacity. While the standing-wave ratio of CSA doping composite was up to 1.1 at 14.2 GHz, which was closer to the traveling wave state. It had the best impedance matching performance with the best reflection loss(RL) of –30 dB(9.93 GHz, 2.75 mm) and the maximum effective absorption bandwidth(RL < –10 dB) of 4.85 GHz(12.30~17.15 GHz, 2 mm).

关 键 词：聚苯胺 氧化石墨烯 掺杂 电磁性能 阻抗匹配 吸波材料 功能材料 

分 类 号：TB34[一般工业技术—材料科学与工程]