银/氧化碳纳米管/还原氧化石墨烯复合材料的辐射制备及其电磁屏蔽效能

One-step radiation-induced synthesis of Ag/o-MWCNT/rGO nanocomposites for electromagnetic interference shielding

以硝酸银、氧化碳纳米管(o-MWCNT)和氧化石墨烯(GO)为原料,采用辐射还原一步法在水溶液中成功制备了银/氧化碳纳米管/还原氧化石墨烯(Ag/o-MWCNT/rGO)复合材料。通过扫描电镜、透射电镜、X射线衍射谱图、拉曼光谱、紫外-可见吸收光谱、X射线光电子能谱等表征手段,证实了优化合成的Ag/o-MWCNT/rGO纳米复合材料为花状结构,银纳米粒子在碳材料中分散均匀,平均粒径约为102 nm,GO被还原为rGO。在合成的纳米复合材料中,o-MWCNT可以增加rGO的层间距,防止其堆积,同时促进导电网络的形成,而且银纳米粒子也有利于提高电磁屏蔽效能。电磁屏蔽结果表明,辐射还原法制备的Ag/o-MWCNT/rGO纳米复合材料具有良好的性能,有望用于制备高性能的电磁屏蔽材料。

Herein, silver nitrate, oxidized multiwall carbon nanotube（o-MWCNT）, and graphene oxide（GO） were used to synthesize silver/oxidized multiwall carbon nanotube/reduced graphene oxide（Ag/o-MWCNT/rGO） nanocomposites in aqueous solution by one-step gamma radiation-induced reduction at room temperature. Scanning electron micrograph, transmission electron micrograph, X-ray diffraction spectrogram, Raman spectrum, ultraviolet-visible absorption spectrum, and X-ray photoelectron spectroscopy confirmed that the structure of Ag/o-MWCNT/rGO nanocomposite prepared under the optimized condition was flower-like, in which GO was reduced to rGO by gamma-irradiation. Nano-silver was dispersed uniformly in the nanocomposite with an average diameter of ～102 nm. The introduction of o-MWCNT can increase the interlayer spacing of GO and overcome its restacking, leading to the formation of conductive networks. We decorated the o-MWCNT/rGO with nano-silver, to improve the electromagnetic interference（EMI） shielding effectiveness（SE） of nanocomposites. Ag/o-MWCNT/rGO nanocomposite with high EMI SE will be an attractive candidate for EMI shielding purpose.