Critical parameters in exfoliating graphite into graphene

Matat Buzaglo, Michael Shtein, Sivan Kober, Robert Lovrinčić, Ayelet Vilan, Oren Regev

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


Dispersing graphite into few-layers graphene sheets (GS) in water is very appealing as an environmental-friendly, low-cost, low-energy method of obtaining graphene. Very high GS concentrations in water (0.7 mg mL-1) were obtained by optimizing the nature of dispersant and the type of ultra-sonic generator. We find that a multi-step sonication procedure involving both tip and bath sources considerably enhances the yield of exfoliated GS. Raman and transmission electron microscopy indicate few-layers graphene patches with typical size of ∼0.65 μm in one dimension and ∼0.35 μm in the other. These were further employed in combination with water-dispersed CNTs to fabricate conductive transparent electrodes for a molecularly-controlled solar-cell with an open-circuit voltage of 0.53 V.

Original languageEnglish
Pages (from-to)4428-4435
Number of pages8
JournalPhysical Chemistry Chemical Physics
Issue number12
StatePublished - 28 Mar 2013

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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