Preparation of water-soluble graphene nanoplatelets and highly conductive films

Xuezhu Xu, Jian Zhou, Jacques Jestin, Veronica Colombo, Gilles Lubineau

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

This paper tackles the challenge of preparation stable, highly concentrated aqueous graphene dispersions. Despite tremendous recent interest, there has been limited success in developing a method that ensures the total dispersion of non-oxidized, defect-free graphene nanosheets in water. This study successfully demonstrates that few-layer graphene nanoplatelets (GNPs) can form highly concentrated aqueous colloidal solutions after they have been pretreated in a low-concentration inorganic sodium-hypochlorite and sodium-bromide salted aqueous solvent. This method retains the graphitic structure as evidenced by nuclear magnetic resonance spectroscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Vacuum-filtrated freestanding films demonstrate an electrical conductivity as high as 3000 S m−1. This dispersion technique is believed to be applicable not only for GNPs, but also for dispersing other types of graphitic materials, including fullerenes, single/double/multi-walled carbon nanotubes, graphene nanoribbons and etc.
Original languageEnglish (US)
Pages (from-to)133-141
Number of pages9
JournalCarbon
Volume124
DOIs
StatePublished - Aug 11 2017

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