Tseng Kuo-Hsiung, Ku Hsueh-Chien, Tien Der-Chi, Stobinski Leszek
Department of Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan.
Materials Chemistry, Warsaw University of Technology, Warynskiego 1, 00-645 Warsaw, Poland.
Nanomaterials (Basel). 2019 Jul 5;9(7):979. doi: 10.3390/nano9070979.
This study used an electrical discharge machine (EDM) to perform an electrical spark discharge method (ESDM), which is a new approach for reducing graphene oxide (GO) at normal temperature and pressure, without using chemical substances. A silver (Ag) electrode generates high temperature and high energy during gap discharge. Ag atoms and Ag nanoparticles (AgNP) are suspended in GO, and ionization generates charged Ag ions in the Ag plasma with a strong reducing property, thereby carrying O away from GO. A large flake-like structure of GO was simultaneously pyrolyzed to a small flake-like structure of reduced graphene oxide (rGO). When Ag was used as an electrode, GO was reduced to rGO and the exfoliated AgNP surface was coated with rGO, thus forming an rGOAg complex. Consequently, suspensibility and dispersion were enhanced.
本研究使用电火花加工机床（EDM）进行电火花放电法（ESDM），这是一种在常温常压下还原氧化石墨烯（GO）的新方法，无需使用化学物质。银（Ag）电极在间隙放电过程中产生高温和高能。Ag原子和Ag纳米颗粒（AgNP）悬浮在GO中，电离在具有强还原性的Ag等离子体中产生带电的Ag离子，从而将O从GO中带走。GO的大片状结构同时热解为还原氧化石墨烯（rGO）的小片状结构。当使用Ag作为电极时，GO被还原为rGO，剥落的AgNP表面被rGO包覆，从而形成rGOAg复合物。因此，悬浮性和分散性得到增强。
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