Electromagnetic interference shielding MWCNT-Fe3O4@Ag/epoxy nanocomposites with satisfactory thermal conductivity and high thermal stability
writer：Lei Wang#, Hua Qiu#, Chaobo Liang, Ping Song, Yixin Han, Yixuan Han, Junwei Gu*
keywords：EMI
source：期刊
Issue time：2019年
Hierarchical composite nanoparticles of multiwall carbon nanotube (MWCNT)-Fe3O4@Ag combining
electrical conductivity and magnetism were obtained from acyl-amine reaction between carboxylation of
Fe3O4@Ag (Fe3O4@Ag-COOH) nanoparticles and amino functionalized MWCNTs (MWCNTs-NH2). Finally,
the MWCNT-Fe3O4@Ag/epoxy nanocomposites were fabricated via blending-casting method. When the
mass ratio of MWCNTs-NH2 to Fe3O4@Ag-COOH was 9:1 (MF-10), the corresponding epoxy nanocomposites
presented an optimal electrical conductivity and electromagnetic interference (EMI)
shielding effectiveness (SE). Furthermore, the MF-10/epoxy nanocomposites with 15 wt% MF-10 presented
a satisfying EMI SE of 35 dB and high electrical conductivity of 0.280 S/cm, satisfactory thermal
conductivity (thermally conductive coefficient, l of 0.46 W/mK), outstanding Young''s modulus of
4.60 GPa & hardness value of 0.26 GPa and excellent thermal stability (THRI of 183.4 C). The introduction
of Fe3O4@Ag nanoparticles not only enhanced the interaction among MF-10, so as to promote the formation
of conductive networks, leading to higher l and EMI SE value, but also contributed to hysteresis
loss of electromagnetic waves, and offered more interfaces to reflect and reabsorb electromagnetic
waves, resulting in highly improved attenuation of electromagnetic waves.