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Synthesis of concentrated aqueous dispersions of reduced graphene oxide

R. TARCAN1, M. HANDREA-DRAGAN1, I. BOTIZ1,2,*

Affiliation

  1. Interdisciplinary Research Institute in Bio-Nano-Sciences, Babes-Bolyai University, 400271 Cluj-Napoca, Romania
  2. Department of Physics of Condensed Matter and Advanced Technologies, Faculty of Physics, Babeș-Bolyai University, 400084 Cluj-Napoca, Romania

Abstract

Reduced graphene oxide (RGO) is an excellent substitute for pristine graphene thanks to its outstanding optical, electrical, and thermal properties. However, a significant challenge remains: the ability to stabilize RGO in aqueous dispersions. This paper proposes a potential method for obtaining stable RGO dispersions in water in rather high concentrations, by using microwave-assisted hydrothermal reduction of graphene oxide in the presence of hydrazine hydrate and ammonia. While UV-vis and Raman analysis confirm the success of the reduction reaction, the dynamic light scattering further shows how centrifugation speed influences the RGO flake size distribution in resulting water dispersions. Furthermore, uniform and homogeneous RGO thin films could be obtained from concentrated water dispersions of RGO by simply employing the spin-coating technique. Fabricating such films from typically diluted RGO water dispersions is highly challenging..

Keywords

Reduced graphene oxide, Dispersion, Microwave-assisted hydrothermal synthesis.

Submitted at: July 19, 2024
Accepted at: Oct. 7, 2024

Citation

R. TARCAN, M. HANDREA-DRAGAN, I. BOTIZ, Synthesis of concentrated aqueous dispersions of reduced graphene oxide, Journal of Optoelectronics and Advanced Materials Vol. 26, Iss. 9-10, pp. 413-421 (2024)