Graphene and their derivatives exhibit interesting properties (mechanical properties, electrical and thermal conductivities). When incorporated into polymer matrices, many applications are possible in fields like electronics, medicine, transportation. The goal of the present review is to highlight how graphene can influence the electrical properties of polymer nanocomposites. The first part explains the peculiar structure of graphene, the main ways to synthesize graphene and the influence on electrical conductivity. In this first part, it is also explained how orientation and alignment of graphene platelets or the presence of a second filler can influence the percolation threshold or electrical conductivity of a monophase polymer nanocomposite. Finally, in this first part, we present some generalities on the enhancement of electrical properties by chemical treatments performed on the graphene. The aim of the second part of this review is to show the effect of the incorporation of graphene into immiscible polymer blends on the microstructures and on the electrical properties. Especially, we focus on the concept of selective localization of nanoparticles into a blend: how to predict the localization of graphene and how to tailor the localization by chemical and kinetics factors. Several graphs were drawn, based on the data of 73 publications, to exhibit the influence of different parameters on the electrical conductivity (in S.cm⁻¹) of graphene based polymer blend nanocomposites. Finally, the last part of this review is dedicated to the electrical applications of graphene-based polymer blend nanocomposites.

石墨烯及其衍生物表现出有趣的特性（机械特性、导电性和导热性）。当掺入聚合物基质中时，在电子、医学、交通等领域的许多应用都是可能的。本综述的目的是强调石墨烯如何影响聚合物纳米复合材料的电性能。第一部分阐述了石墨烯的独特结构、石墨烯的主要合成方法及其对导电性的影响。在第一部分中，还解释了石墨烯片的取向和排列或第二填料的存在如何影响单相聚合物纳米复合材料的渗滤阈值或电导率。最后，在第一部分中，我们介绍了通过对石墨烯进行化学处理来增强电性能的一些一般性。本综述第二部分的目的是展示石墨烯掺入不混溶聚合物共混物对微观结构和电性能的影响。特别是，我们关注纳米粒子选择性定位到混合物中的概念：如何预测石墨烯的定位以及如何通过化学和动力学因素调整定位。基于73篇出版物的数据绘制了几张图表，以展示不同参数对基于石墨烯的聚合物共混纳米复合材料的电导率（以S.cm ^-1为单位）的影响。最后，本综述的最后一部分致力于石墨烯基聚合物共混纳米复合材料的电气应用。