Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 3, Pages 447-455Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201503782
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Funding
- National Natural Science Foundation of China [51373011, 51125010, 51533001]
- Fundamental Research Funds for the Central Universities [YS201402]
- State Key Laboratory of Organic-Inorganic Composites [201501007]
- China Scholarship Council for Young Scholar Studies Abroad [201406885081]
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Light-weight and high-performance electromagnetic interference (EMI)shielding epoxy nanocomposites are prepared by an infiltration method using a 3D carbon nanotube (CNT) sponge as the 3D reinforcement and conducting framework. The preformed, highly porous, and electrically conducting framework acts as a highway for electron transport and can resist a high external loading to protect the epoxy nanocomposite. Consequently, a remarkable conductivity of 148 S m(-1) and an outstanding EMI shielding effectiveness of around 33 dB in the X-band are achieved for the epoxy nanocomposite with 0.66 wt% of CNT sponge, which is higher than that achieved for epoxy nanocomposites with 20 wt% of conventional CNTs. More importantly, the CNT sponge provides a dual advantage over conventional CNTs in its prominent reinforcement and toughening of the epoxy composite. Only 0.66 wt% of CNT sponge significantly increases the flexural and tensile strengths by 102% and 64%, respectively, as compared to those of neat epoxy. Moreover, the nanocomposite shows a 250% increase in tensile toughness and a 97% increase in elongation at break. These results indicate that CNT sponge is an ideal functional component for mechanically strong and high-performance EMI-shielding nanocomposites.
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