Advancement in liquid exfoliation of graphite through simultaneously oxidizing and ultrasonicating

Shi, Ge, Michelmore, Andrew, Jin, Jian, Li, Lu Hua, Chen, Ying, Wang, Lianzhou, Yu, Hua, Wallace, Gordon, Gambhir, Sanjeev, Zhu, Shenmin, Hojati-Talemi, Pejman and Ma, Jun (2014) Advancement in liquid exfoliation of graphite through simultaneously oxidizing and ultrasonicating. Journal of Materials Chemistry A, 2 47: 20382-20392. doi:10.1039/c4ta04367g


Author Shi, Ge
Michelmore, Andrew
Jin, Jian
Li, Lu Hua
Chen, Ying
Wang, Lianzhou
Yu, Hua
Wallace, Gordon
Gambhir, Sanjeev
Zhu, Shenmin
Hojati-Talemi, Pejman
Ma, Jun
Title Advancement in liquid exfoliation of graphite through simultaneously oxidizing and ultrasonicating
Journal name Journal of Materials Chemistry A   Check publisher's open access policy
ISSN 2050-7488
2050-7496
Publication date 2014-12-21
Year available 2014
Sub-type Article (original research)
DOI 10.1039/c4ta04367g
Open Access Status Not Open Access
Volume 2
Issue 47
Start page 20382
End page 20392
Total pages 11
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2015
Language eng
Formatted 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 [similar]1000 Ω square−1 with 80% transparency at 550 nm.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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