Correlation of electrical conductivity, dielectric properties, microwave absorption, and matrix properties of composites filled with graphene nanoplatelets and carbon nanotubes
Correlation of electrical conductivity, dielectric properties, microwave absorption, and matrix properties of composites filled with graphene nanoplatelets and carbon nanotubes
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DOI：
10.1063/1.4927617
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发表时间：
2015-07-28
影响因子：
3.2
通讯作者：
Munir, Arshad
中科院分区：
文献类型：
--
作者：
Khurram, A. A.;Rakha, Sobia A.;Munir, Arshad
研究了石墨烯纳米片（GNP）填充环氧树脂复合材料的直流电导率、逾渗阈值和介电性能，并与微波吸收进行了关联。GNP填充复合材料的性能也进行了比较，与多壁碳纳米管（MWCNTs）复合材料，和GNP被观察到具有上级导电性比MWCNTs。在所有批次中，纳米填料具有0.5、1.0、1.5、2.0、2.5、3.0和3.5wt. %.所有的复合材料，无论类型的纳米填料和粘度的基质已显示出电渗流阈值在3.0重量%。%.介电性能，即，在100 Hz-5.5 MHz下研究了复介电常数、tan损耗和AC电导率。在100 Hz-5.5 MHz下测量的DC和AC电导率（在渗流处和渗流以下）与微波频率范围（11-17 GHz）内的GNP和MWCNT环氧复合材料相关。对于MWCNT和GNP，分别确定了-12dB和-6dB的最大回波损耗。纳米填料的形状和粘度的基质上的分散和颗粒间的间距的导电性填料在聚合物基体内的影响进行了讨论的基础上的导电性，介电性和吸收性能的结果。(C)2015 AIP Publishing LLC.
The DC electrical conductivity, percolation threshold, and dielectric properties of Graphene Nanoplatelets (GNPs) filled epoxy composites are studied and correlated with microwave absorption. The properties of GNPs filled composites are also compared with multiwalled carbon nanotubes (MWCNTs) composites, and GNPs are observed to have superior conductivity than MWCNTs. In all batches, the nanofillers have 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5 wt. %. All composites irrespective of the type of nanofiller and viscosity of the matrix have shown electrical percolation threshold at 3.0 wt. %. The dielectric properties, i.e., complex permittivity, tan loss, and AC conductivity, are studied in 100 Hz-5.5 MHz. The DC and AC electrical conductivities (at and below the percolation) measured in 100 Hz-5.5MHz are correlated to the GNPs and MWCNTs epoxy composites in the microwave frequency range (11-17 GHz). The maximum return loss of -12 dB and -6 dB was determined for MWCNTs and GNPs, respectively. The effects of nanofiller shape and the viscosity of the matrix on the dispersion and interparticle spacing of the conductive fillers within the polymer matrix have been discussed based on the results of conductivity, dielectric, and absorption properties. (C) 2015 AIP Publishing LLC.