Rapid and direct conversion of graphite crystals into high-yielding, good-quality graphene by supercritical fluid exfoliation

Dinesh Rangappa, Koji Sone, Mingsheng Wang, Ujjal K. Gautam, Dmitri Golberg, Hiroshi Itoh, Masaki Ichihara, Itaru Honma

Research output: Contribution to journalArticlepeer-review

146 Citations (Scopus)

Abstract

Graphene has attracted a great deal of attention in recent years due to its unusual electronic, mechanical, and thermal properties. Exploiting graphene properties in a variety of applications requires a chemical approach for the large-scale production of highquality, processable graphene sheets (GS), which has remained an unanswered challenge. Herein, we report a rapid one-pot supercritical fluid (SCF) exfoliation process for the production of high-quality, large-scale, and processable graphene for technological applications. Direct high-yield conversion of graphite crystals to GS is possi-ble under SCF conditions because of the high diffusivity and solvating power of SCFs, such as ethanol, N-methyl-pyrrolidone (NMP), and DMF. For the first time, we report a one-pot direct conversion of graphite crystals to a high yield of graphene sheets in which about 90-95 % of the exfoliated sheets are < 8 layers with approximately 610% monolayers and the remaining 510% are ≥ 10 layers.

Original languageEnglish
Pages (from-to)6488-6494
Number of pages7
JournalChemistry - A European Journal
Volume16
Issue number22
DOIs
Publication statusPublished - 2010 Jun 11
Externally publishedYes

Keywords

  • Conducting materials
  • Exfoliation
  • Graphene
  • Scanning probe microscopy
  • Supercritical fluids

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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