Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/94839
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Type: Journal article
Title: Advancement in liquid exfoliation of graphite through simultaneously oxidizing and ultrasonicating
Author: Shi, G.
Michelmore, A.
Jin, J.
Li, L.
Chen, Y.
Wang, L.
Yu, H.
Wallace, G.
Gambhir, S.
Zhu, S.
Hojati-Talemi, P.
Ma, J.
Citation: Journal of Materials Chemistry A, 2014; 2(47):20382-20392
Publisher: Royal Society of Chemistry
Issue Date: 2014
ISSN: 2050-7488
2050-7496
Statement of
Responsibility: 
Ge Shi, Andrew Michelmore, Jian Jin, Lu Hua Li, Ying Chen, Lianzhou Wang, Hua Yu, Gordon Wallace, Sanjeev Gambhir, Shenmin Zhu, Pejman Hojati-Talemi and Jun Ma
Abstract: Layered crystals, once exfoliated in liquids, create nanosheets with large surface area and likely generate electron band gaps. The current liquid exfoliation of graphite is performed by either oxidation, ultrasonication or the oxidation followed by ultrasonication; these methods are respectable but have limitations in general: the oxidation actually produces graphene oxide while the sonication is time-consuming with a low yield. In this paper we report a highly effective yet simple approach for the fabrication of high-quality graphene; the approach consists of simultaneously oxidizing and ultrasonicating graphite for merely 60 min, followed by washing and filtration. Exfoliation was markedly promoted by the simultaneous treatment, where 80% of the sheets comprise single or few layers with lateral dimensions ranging 50 nm to over 100 nm; their carbon to oxygen ratio is at 8.85; the ratio of Raman D- to G-band intensity is as low as 0.211; and the sheets can be stably dispersed in acetone for at least 48 hours and they have an electrical conductivity over 600 S cm−1. A thin graphene film made by casting exhibited a sheet resistance of ∼1000 Ω square−1 with 80% transparency at 550 nm.
Description: First published online 28 Oct 2014
Rights: This journal is © The Royal Society of Chemistry 2014
RMID: 0030016679
DOI: 10.1039/c4ta04367g
Grant ID: http://purl.org/au-research/grants/arc/LP140100605
Appears in Collections:Chemical Engineering publications

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