Graphene exfoliation with supercritical fluids

다국어 초록 (Multilingual Abstract)

Graphene is an unconventional material with a two-dimensional hexagonal crystalline array of elemental carbon atoms and outstanding properties; accordingly, a desirable objective in the line of research of graphene is the development of novel and more productive methods of synthesis, validating its properties and applications. In our exploratory research, we have effectively exfoliated graphene from graphite using supercritical fluids (water, ethanol and carbon dioxide). The exfoliated graphene was properly characterized; via scanning electron microscopy, the morphology of graphene was observed; Raman spectra confirmed the exfoliation of graphene depicting the characteristic shift towards smaller Raman number in the 2D band (2676 cm?1) compared to that of graphite (? 2700 cm?1); COMMIT; transmission electron microscopy analysis exhibited the crystalline structure of graphene attesting also the expected transparency of exfoliated layers. Graphene exfoliation from graphite by supercritical fluids promises to be a simple large-scale method for graphene production.

목차 (Table of Contents)

• Abstract
• 1 Introduction
• 2 Experimental
• 2.1 Materials
• 2.2 Supercritical exfoliation of?graphene
• 2.3 Supercritical water and?supercritical ethanol exfoliation experiments
• 2.4 Supercritical CO2 exfoliation experiments
• 2.5 Characterization
• 3 Results and?discussion
• 4 Conclusions
• Acknowledgements
• References