State Key Laboratory of Organic-Inorganic Composites, Department of Polymer Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
ACS Appl Mater Interfaces. 2011 Aug;3(8):3130-3. doi: 10.1021/am200628c. Epub 2011 Jul 20.
We compared the electrical conductivity of multiwalled-carbon-nanotube/polystyrene and graphene/polystyrene composites. The conductivity of polystyrene increases from ∼6.7 × 10(-14) to ∼3.49 S/m, with an increase in graphene content from ∼0.11 to ∼1.1 vol %. This is ∼2-4 orders of magnitude higher than for multiwalled-carbon-nanotube/polystyrene composites. Furthermore, we show that the conductivity of the graphene/polystyrene system can be significantly enhanced by incorporation of polylactic acid. The volume-exclusion principle forces graphene into the polystyrene-rich regions (selective localization) and generates ∼4.5-fold decrease in its percolation threshold from ∼0.33 to ∼0.075 vol %.
我们比较了多壁碳纳米管/聚苯乙烯和石墨烯/聚苯乙烯复合材料的电导率。随着石墨烯含量从约 0.11 到约 1.1 体积%的增加，聚苯乙烯的电导率从约 6.7×10^(-14)增加到约 3.49 S/m。这比多壁碳纳米管/聚苯乙烯复合材料高约 2-4 个数量级。此外，我们还表明，通过掺入聚乳酸可以显著提高石墨烯/聚苯乙烯体系的电导率。体积排除原理将石墨烯强制纳入富含聚苯乙烯的区域（选择性定位），并使其渗流阈值从约 0.33 降至约 0.075 体积%，降低约 4.5 倍。
