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Novel Preparation of Reduced Graphene Oxide–Silver Complex using an Electrical Spark Discharge Method

1
Department of Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
2
Materials Chemistry, Warsaw University of Technology, Warynskiego 1, 00-645 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 979; https://doi.org/10.3390/nano9070979
Received: 7 June 2019 / Revised: 30 June 2019 / Accepted: 2 July 2019 / Published: 5 July 2019
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Abstract

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. View Full-Text
Keywords: graphene oxide; reduced graphene oxide; silver nanoparticle; electrical spark discharge method; nanocomposite graphene oxide; reduced graphene oxide; silver nanoparticle; electrical spark discharge method; nanocomposite
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MDPI and ACS Style

Tseng, K.-H.; Ku, H.-C.; Tien, D.-C.; Stobinski, L. Novel Preparation of Reduced Graphene Oxide–Silver Complex using an Electrical Spark Discharge Method. Nanomaterials 2019, 9, 979.

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