Additive-free hydrogelation of graphene oxide by ultrasonication

Owen C. Compton, Zhi An, Karl W. Putz, Bong Jin Hong, Brad G. Hauser, L. Catherine Brinson, Sonbinh T. Nguyen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

Graphene oxide hydrogels have been prepared by ultrasonication of precursor aqueous dispersions. The ultrasonication fractures the nanosheets, reducing their dimensions and exposing new sheet edges that do not possess the stabilizing carboxyl functional groups found along the edge of the as-prepared material. Ultrasonication does not affect the overall chemical functionality of the graphene oxide nanosheets, as spectra (carbon-13 nuclear magnetic resonance spectroscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy) of samples before and after ultrasonication are nearly identical. Gelation is induced after only 30 min of ultrasonication to achieve a relatively weak gel with a shear modulus of 0.3 kPa; however, extension of ultrasonic treatment to 120 min yields a more robust hydrogel with a shear modulus of 1.6 kPa. Such enhancement in the gel's physical properties can be attributed to the lack of stabilizing carboxyl groups on newly generated nanosheet fragments from the interior regions of the original nanosheets. As prepared, these hydrogels exhibit exceptionally low critical gelation concentrations ranging from ∼0.050 to ∼0.125 mg mL -1 that can be tuned according to the extent of ultrasonic treatment.

Original languageEnglish (US)
Pages (from-to)3399-3406
Number of pages8
JournalCarbon
Volume50
Issue number10
DOIs
StatePublished - Aug 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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