Sonication-free dispersion of large-area graphene oxide sheets using internal pressure from release of intercalated carbon dioxide

Daewoo Kim, Daeok Kim, Byung Hyun Min, Huen Lee, Hee Tae Jung

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Abstract A new concept to disperse graphene sheets without sonication, significant size reduction, and any further removal of intercalating materials, is demonstrated using ejection pressure of CO2 gas captured by water molecules dissolved in the interlayer of graphene and the ice structure surrounding it. After graphene oxide (GO) layers are swelled with water molecules, CO2 gas is dissolved in the swelled interlayer of GO. The CO2 gas within the GO layers is well maintained by the transformation of excess water molecules outside of interlayer to solid ice at low temperature (around -30 °C). The resulting CO2-incorporating GOs are well dispersed in various solvents by the ejection pressure of stored CO2 without sonication, and without additional treatment for removal of the intercalating material as surrounding ices spontaneously melt. We show that the lateral length of these well-dispersed GO sheets is 10 times larger than that of GO sheets obtained by the conventional sonication method.

Original languageEnglish
Article number9744
Pages (from-to)126-132
Number of pages7
JournalCarbon
Volume88
DOIs
Publication statusPublished - 2015 Jul 1

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Sonication
Graphite
Carbon Dioxide
Oxides
Graphene
Carbon dioxide
Ice
Gases
Molecules
Water

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Kim, Daewoo ; Kim, Daeok ; Min, Byung Hyun ; Lee, Huen ; Jung, Hee Tae. / Sonication-free dispersion of large-area graphene oxide sheets using internal pressure from release of intercalated carbon dioxide. In: Carbon. 2015 ; Vol. 88. pp. 126-132.
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Sonication-free dispersion of large-area graphene oxide sheets using internal pressure from release of intercalated carbon dioxide. / Kim, Daewoo; Kim, Daeok; Min, Byung Hyun; Lee, Huen; Jung, Hee Tae.

In: Carbon, Vol. 88, 9744, 01.07.2015, p. 126-132.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Sonication-free dispersion of large-area graphene oxide sheets using internal pressure from release of intercalated carbon dioxide

AU - Kim, Daewoo

AU - Kim, Daeok

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AU - Jung, Hee Tae

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AB - Abstract A new concept to disperse graphene sheets without sonication, significant size reduction, and any further removal of intercalating materials, is demonstrated using ejection pressure of CO2 gas captured by water molecules dissolved in the interlayer of graphene and the ice structure surrounding it. After graphene oxide (GO) layers are swelled with water molecules, CO2 gas is dissolved in the swelled interlayer of GO. The CO2 gas within the GO layers is well maintained by the transformation of excess water molecules outside of interlayer to solid ice at low temperature (around -30 °C). The resulting CO2-incorporating GOs are well dispersed in various solvents by the ejection pressure of stored CO2 without sonication, and without additional treatment for removal of the intercalating material as surrounding ices spontaneously melt. We show that the lateral length of these well-dispersed GO sheets is 10 times larger than that of GO sheets obtained by the conventional sonication method.

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