Chemically active reduced graphene oxide with tunable C/O ratios

Owen C. Compton, Bonny Jain, Dmitriy A. Dikin, Ali Abouimrane, Khalil Amine, SonBinh Nguyen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

265 Scopus citations

Abstract

Organic dispersions of graphene oxide can be thermally reduced in polar organic solvents under reflux conditions to afford electrically conductive, chemically active reduced graphene oxide (CARGO) with tunable C/O ratios, dependent on the boiling point of the solvent. The reductions are achieved after only 1 h of reflux, and the corresponding C/O ratios do not change upon further thermal treatment. Hydroxyl and carboxyl groups can be removed when the reflux is carried out above 155 °C, while epoxides are removable only when the temperature is higher than 200 °C. The increasing hydrophobic nature of CARGO, as its C/O ratio increases, improves the dispersibility of the nanosheets in a polystyrene matrix, in contrast to the aggregates formed with CARGO having lower C/O ratios. The excellent processability of the obtained CARGO dispersions is demonstrated via free-standing CARGO papers that exhibit tunable electrical conductivity/chemical activity and can be used as lithium-ion battery anodes with enhanced Coulombic efficiency.

Original languageEnglish (US)
Pages (from-to)4380-4391
Number of pages12
JournalACS Nano
Volume5
Issue number6
DOIs
StatePublished - Jun 28 2011

Keywords

  • graphene
  • graphene oxide
  • lithium-ion battery
  • surface functionalization
  • thermal reduction

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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