Highly Conductive Multifunctional Graphene Polycarbonate Nanocomposites
Highly Conductive Multifunctional Graphene Polycarbonate Nanocomposites
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DOI：
10.1021/nn1019626
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发表时间：
2010-12-01
期刊：
影响因子：
17.1
通讯作者：
Gaier, James R.
中科院分区：
文献类型：
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作者：
Yoonessi, Mitra;Gaier, James R.
通过乳液混合和溶液共混方法制备的石墨烯纳米片-双酚A聚碳酸酯纳米复合材料（0.027-2.2体积%），随后在287 ° C下压缩成型，分别表现出类似于0.14体积%和类似于0.38体积%的直流电逾渗阈值。对于乳液和溶液混合，2.2体积%石墨烯纳米复合材料的电导率为0.512和0.226 S/cm。1.1和2.2体积%的石墨烯纳米复合材料表现出频率无关的行为。固有的导电性，极高的纵横比，和使用PC纳米球的石墨烯的纳米结构定向组装是纳米复合材料的优异电性能的主要因素。纳米复合材料的动态拉伸模量随着纳米复合材料中石墨烯的增加而增加。对于乳液系列，玻璃化转变温度随着石墨烯的增加而降低。高分辨率电子显微镜（HR-TEM）和小角中子散射（SANS）显示绝缘纳米复合材料和导电纳米复合材料的连接纳米粒子的孤立的石墨烯没有连接路径。使用堆叠盘模型通过模拟实验SANS数据来获得平均颗粒半径、每个堆叠的石墨烯层的平均数量和堆叠间距。形态学研究表明存在良好分散的石墨烯和小石墨烯堆叠，其中在堆叠内注入聚碳酸酯。
Graphene nanosheet - bisphenol A polycarbonate nanocomposites (0.027-2.2 vol %) prepared by both emulsion mixing and solution blending methods, followed by compression molding at 287 degrees C, exhibited dc electrical percolation threshold of similar to 0.14 and similar to 0.38 vol %, respectively. The conductivities of 2.2 vol % graphene nanocomposites were 0.512 and 0.226 S/cm for emulsion and solution mixing. The 1.1 and 2.2 vol % graphene nanocomposites exhibited frequency-independent behavior. Inherent conductivity, extremely high aspect ratio, and nanostructure directed assembly of the graphene using PC nanospheres are the main factors for excellent electrical properties of the nanocomposites. Dynamic tensile moduli of nanocomposites increased with increasing graphene in the nanocomposite. The glass transition temperatures were decreased with increasing graphene for the emulsion series. High-resolution electron microscopy (HR-TEM) and small-angle neutron scattering (SANS) showed isolated graphene with no connectivity path for insulating nanocomposites and connected nanoparticles for the conductive nanocomposites. A stacked disk model was used to obtain the average particle radius, average number of graphene layers per stack, and stack spacing by simulation of the experimental SANS data. Morphology studies indicated the presence of well-dispersed graphene and small graphene stacking with infusion of polycarbonate within the stacks.