激光诱导石墨烯的纳米银颗粒原位修饰及其导电性能调控  

In-situ modification of laser-induced graphene with silver nanoparticles and its electronic conductivity modulation

作　　者：王文波[1,2] 宋彦平 李年 王振洋 WANG Wenbo;SONG Yanping;LI Nian;WANG Zhenyang(University of Science and Technology of China,Hefei 230026,China;Institute of Solid State Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]中国科学技术大学,合肥230026 [2]中国科学院合肥物质科学研究院固体物理研究所,合肥230031

出　　处：《复合材料学报》2024年第8期4124-4133,共10页Acta Materiae Compositae Sinica

基　　金：安徽省科技重大专项(202103a05020013)。

摘　　要：随着高频通信技术的快速发展,由电磁波造成的电磁干扰问题日益严重,亟需开发针对5G频段的电磁屏蔽材料。以两次激光诱导法直接在固体材料上快速制备了银纳米颗粒/多孔石墨烯柔性复合薄膜:首次激光制备的亲水性激光诱导石墨烯(LIG)能够高效吸附AgNO_(3)溶液,二次激光照射实现了银纳米粒子在多孔石墨烯上的原位生成和均匀负载。进一步研究了不同AgNO_(3)浓度对所制得Ag/LIG材料的微观形貌、结构性质和导电特性的影响。结果表明:当AgNO_(3)浓度为0.5 mol/L时,复合薄膜中银纳米颗粒保持小尺寸的同时分散性最好,其展现出2788 S/m的高电导率;同时,材料屏蔽效能从LIG的18~26 dB增加到复合材料的36~40 dB。在26 GHz频段处,Ag/LIG的屏蔽效能达到38 dB,经200次弯曲循环后效能保有率在90%以上。With the rapid development of high-frequency communication technology,electromagnetic interference(EMI)issue has been increasing.Hence,EMI shielding materials for the 5G frequency band are in high demand.Here,a two-step laser-induced strategy was developed to rapidly prepare silver nanoparticles/porous graphene flexible composite in a solid-phase synthesis process.AgNO_(3)solution can be efficiently adsorbed by hydrophilic laser-induced graphene(LIG)obtained by the first laser irradiation with tuned parameters,which provides favorable conditions for the abundant and homogeneous loading of Ag nanoparticles on LIG after in-situ the second laser irradiation.Furthermore,the microstructures,structural properties and electronic conductivity of the prepared Ag/LIG composites with different AgNO_(3)additive concentrations are detailedly analyzed.As a result,with a 0.5 mol/L AgNO_(3)additive concentration,Ag nanoparticles in the composite film maintain small size while exhibiting the best dispersion,exhibiting a high conductivity of 2788 S/m.In the 18-27 GHz frequency band,the EMI shielding effectiveness increases from 18-26 dB of LIG to 36-40 dB of composite materials.The EMI shielding effectiveness of Ag/LIG-0.5 at the 26 GHz reaches 38 dB with an over 90%shielding effectiveness retention rate after 200 bending cycles.

关 键 词：激光诱导石墨烯 银纳米颗粒 分散性 导电性 电磁屏蔽 

分 类 号：TB332[一般工业技术—材料科学与工程]