Abstract Thermal sprayed thick glass coatings with a small percentage of multilayer graphene nanoplatelets (GNP) demonstrate electrical functionality with a quite remarkable low percolation limit (1.18 vol.%). This low critical content and the high electrical conductivity (∼40 S m−1) observed for the in-plane direction are related to the peculiar coating microstructure, formed by the pileup of lamellar amorphous particles decorated by GNP mostly following a surface parallel orientation. The general effective media model fitting to the electrical conductivity data for these coatings suggests a 3D connectivity of graphene and estimates an upper limit conductivity for the GNP of 105 S m−1. Hall effect shows the n-type behavior intrinsic to the SiO2/graphene interface, and carrier density and mobility rising with the GNP content. In addition, the coatings evidence a very high solar absorptivity that jointly with their high electrical conductivity broadens their potential applications, among others, for electromagnetic interference shielding or as photothermal detector and solar absorber for solar steam generation and water desalination.

中文翻译：

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高导电石墨烯纳米片/玻璃复合涂层的低渗透阈值

摘要 具有少量多层石墨烯纳米片 (GNP) 的热喷涂厚玻璃涂层表现出具有非常低的渗透极限 (1.18 vol.%) 的电功能。在面内方向观察到的这种低临界含量和高电导率（~40 S m-1）与特殊的涂层微观结构有关，由 GNP 修饰的层状非晶颗粒堆积形成，主要遵循表面平行取向。拟合这些涂层的电导率数据的一般有效介质模型表明石墨烯的 3D 连接性，并估计 GNP 的上限电导率为 105 S m-1。霍尔效应显示了 SiO2/石墨烯界面固有的 n 型行为，载流子密度和迁移率随着 GNP 含量的增加而上升。此外，