Cationic surfactant mediated exfoliation of graphite into graphene flakes

Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.carbon.2009.07.049

Title:	Cationic surfactant mediated exfoliation of graphite into graphene flakes
Authors:	Vadukumpully, S. Paul, J. Valiyaveettil, S.
Issue Date:	Nov-2009
Citation:	Vadukumpully, S., Paul, J., Valiyaveettil, S. (2009-11). Cationic surfactant mediated exfoliation of graphite into graphene flakes. Carbon 47 (14) : 3288-3294. ScholarBank@NUS Repository. https://doi.org/10.1016/j.carbon.2009.07.049
Abstract:	A simple and effective method for the preparation of a few layered graphene nanoflakes directly from graphite has been successfully demonstrated. Mild ultrasonication of highly ordered pyrolytic graphite, in presence of a cationic surfactant cetyltrimethylammonium bromide and acetic acid yielded graphene nanoflakes, which formed a stable colloidal suspension in organic solvent such as N,N-dimethyl formamide. Scanning and transmission electron microscopic analyses showed that the dispersed phase consist of mainly few layered graphene nanoflakes. Average thickness of the flakes was found to be ∼1.18 nm. Energy dispersive X-ray analysis indicated the absence of graphene oxide. Field emission measurements for the nanoflakes showed a turn on voltage of 7.5 V/μm and emission current densities of 0.15 mA/cm2. © 2009 Elsevier Ltd. All rights reserved.
Source Title:	Carbon
URI:	http://scholarbank.nus.edu.sg/handle/10635/93250
ISSN:	00086223
DOI:	10.1016/j.carbon.2009.07.049
Appears in Collections:	Staff Publications

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