Thermal conductivity of a graphene oxide-carbon nanotube hybrid/epoxy composite

被引:358
作者
Im, Hyungu [1 ]
Kim, Jooheon [1 ]
机构
[1] Chung Ang Univ, Sch Chem Engn & Mat Sci, Seoul 156756, South Korea
基金
新加坡国家研究基金会;
关键词
GRAPHITE NANOPLATELET; NANOCOMPOSITES; BEHAVIOR; AL2O3;
D O I
10.1016/j.carbon.2012.07.029
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Thermally conductive graphene oxide (GO)-multi-wall carbon nanotube (MWCNT)/epoxy composite materials were fabricated by epoxy wetting. The polar functionality on the GO surface allowed the permeation of the epoxy resin due to a secondary interaction between them, which allowed the fabrication of a composite containing a high concentration of this hybrid filler. The thermal transport properties of the composites were maximized at 50 wt.% of filler due to fixed pore volume fraction in filtrated GO cake. When the total amount of filler was fixed 50 wt.% while changing the amount of MWCNTs, a maximum thermal conductivity was obtained with the addition of about 0.36 wt.% of MWCNTs in the filler. Measured thermal conductivity was higher than the predicted value based on the by Maxwell-Garnett (M-G) approximation and decreased for MWCNT concentrations above 0.4%. The increased thermal conductivity was due to the formation of 3-D heat conduction paths by the addition of MWCNTs. Too high a MWCNT concentration led to increased phonon scattering, which in turn led to decreased thermal conductivity. The measured storage modulus was higher than that of the solvent mixed composite because of the insufficient interface between the large amount of filler and the epoxy. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:5429 / 5440
页数:12
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