[Sustainable Materials and Technologies]Honeycomb structural rGO-MXene/epoxy nanocomposites for superior electromagnetic interference shielding performance
writer：Ping Song#, Hua Qiu#, Lei Wang, Xinyu Liu, Yali Zhang, Junliang Zhang, Jie Kong and Junwei Gu*
keywords：Honeycomb, MXene, electromagnetic interference shielding
source：期刊
specific source：Sustainable Materials and Technologies
Issue time：2020年
Honeycomb structural rGO (rGH) was constructed by taking Al2O3 honeycomb as template, and MXene was then self-assembled on the rGH via electrostatic adsorption, to obtain honeycomb structural rGO-MXene (rGMH). Afterwards, the rGMH/epoxy nanocomposites with outstanding electromagnetic interference (EMI) shielding performance were successfully prepared by addition of epoxy resin. The introduction of 3D rGMH can fully play synergistic effects of rGO and MXene, to greatly improve the electrical conductivity (σ) and EMI shielding effectiveness (EMI SE) values of rGMH/epoxy nanocomposites. With the same loading of MXene, the σand EMI SE values of rGMH/epoxy nanocomposites decrease with the increase of honeycomb cell size. Significantly enhanced σ (387.1 S/m) and EMI SE (55 dB) values are achieved when applying the cell size of 0.5 mm with 1.2 wt% rGO + 3.3 wt% MXene loading, which are respectively 2978 and 5 times of rGM/epoxy nanocomposites (σ of 0.13 S/m, EMI SE of 11 dB) at the same loading of directly blending rGO-MXene fillers.
以氧化鋁（Al2O3）蜂窩為模板構(gòu)建還原氧化石墨烯（rGO）蜂窩結(jié)構(gòu)（rGH），并基于靜電吸附將MXene自組裝在rGH上得到具有一定結(jié)構(gòu)承載性和完善導(dǎo)電網(wǎng)絡(luò)的rGO-MXene蜂窩結(jié)構(gòu)（rGMH），再澆注環(huán)氧樹脂、經(jīng)高溫固化制備rGMH/環(huán)氧樹脂電磁屏蔽納米復(fù)合材料。結(jié)果表明，rGMH三維骨架結(jié)構(gòu)的引入可以充分發(fā)揮rGO和MXene的協(xié)同作用，大幅度提升rGMH/環(huán)氧樹脂電磁屏蔽納米復(fù)合材料的電導(dǎo)率（s）和電磁屏蔽效能（EMI SE）。在MXene用量相同時(shí)，rGMH/環(huán)氧樹脂納米復(fù)合材料的s和EMI SE均隨蜂窩孔徑的增大而減小。當(dāng)蜂窩孔格為0.5mm，rGO和MXene用量分別為1.2 wt%和3.3 wt%時(shí)，rGMH/環(huán)氧樹脂電磁屏蔽納米復(fù)合材料具有最高的s（387.1 S/m）和EMI SE（55dB），是同等用量共混（rGO-MXene，rGM）/環(huán)氧樹脂電磁屏蔽納米復(fù)合材料的（s為0.13 S/m，EMI SE為11dB）2978和5倍。