Preparation of graphite nanoplatelets and graphene sheets

Yan Geng; Shu Jun Wang; Jang Kyo Kim

doi:10.1016/j.jcis.2009.04.005

Preparation of graphite nanoplatelets and graphene sheets

Yan Geng, Shu Jun Wang, Jang Kyo Kim

Mechanical & Nuclear Engineering

The Hong Kong University of Science and Technology

Research output: Contribution to journal › Article › peer-review

420 Scopus citations

Abstract

A novel route is proposed to produce graphite nanoplatelets (GNPs) and graphene sheets. The natural graphite flakes were directly exfoliated by ultrasonication in formic acid. A stable graphene aqueous dispersion was obtained using the as-produced GNPs after two processing steps: (i) chemical oxidation of GNPs to graphite oxide nanoplatelets (GONPs); and (ii) chemical reduction of graphite oxide nanoplatelets to graphene. The total duration for oxidation and production of stable graphite oxide colloid was significantly shortened due to the use of exfoliated GNPs with large surface area. The work proposed here has several advantages over the previous methods, including a high efficiency of exfoliation process, the use of a non-toxic, environmental-friendly intercalant and the capability for mass production of graphene for industrial applications.

Original language	British English
Pages (from-to)	592-598
Number of pages	7
Journal	Journal of Colloid and Interface Science
Volume	336
Issue number	2
DOIs	https://doi.org/10.1016/j.jcis.2009.04.005
State	Published - 15 Aug 2009

Keywords

Exfoliation
Formic acid
Graphene
Graphite nanoplatelet

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10.1016/j.jcis.2009.04.005

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title = "Preparation of graphite nanoplatelets and graphene sheets",

abstract = "A novel route is proposed to produce graphite nanoplatelets (GNPs) and graphene sheets. The natural graphite flakes were directly exfoliated by ultrasonication in formic acid. A stable graphene aqueous dispersion was obtained using the as-produced GNPs after two processing steps: (i) chemical oxidation of GNPs to graphite oxide nanoplatelets (GONPs); and (ii) chemical reduction of graphite oxide nanoplatelets to graphene. The total duration for oxidation and production of stable graphite oxide colloid was significantly shortened due to the use of exfoliated GNPs with large surface area. The work proposed here has several advantages over the previous methods, including a high efficiency of exfoliation process, the use of a non-toxic, environmental-friendly intercalant and the capability for mass production of graphene for industrial applications.",

keywords = "Exfoliation, Formic acid, Graphene, Graphite nanoplatelet",

author = "Yan Geng and Wang, {Shu Jun} and Kim, {Jang Kyo}",

note = "Funding Information: This project was supported by Henkel International, formerly Imperial Chemical Industries Limited (Project No. ICIPLC001.07/08). Technical assistance from the Materials Characterization and Preparation Facilities (MCPF) at HKUST is appreciated. ",

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AU - Geng, Yan

AU - Wang, Shu Jun

AU - Kim, Jang Kyo

N1 - Funding Information: This project was supported by Henkel International, formerly Imperial Chemical Industries Limited (Project No. ICIPLC001.07/08). Technical assistance from the Materials Characterization and Preparation Facilities (MCPF) at HKUST is appreciated.

PY - 2009/8/15

Y1 - 2009/8/15

N2 - A novel route is proposed to produce graphite nanoplatelets (GNPs) and graphene sheets. The natural graphite flakes were directly exfoliated by ultrasonication in formic acid. A stable graphene aqueous dispersion was obtained using the as-produced GNPs after two processing steps: (i) chemical oxidation of GNPs to graphite oxide nanoplatelets (GONPs); and (ii) chemical reduction of graphite oxide nanoplatelets to graphene. The total duration for oxidation and production of stable graphite oxide colloid was significantly shortened due to the use of exfoliated GNPs with large surface area. The work proposed here has several advantages over the previous methods, including a high efficiency of exfoliation process, the use of a non-toxic, environmental-friendly intercalant and the capability for mass production of graphene for industrial applications.

AB - A novel route is proposed to produce graphite nanoplatelets (GNPs) and graphene sheets. The natural graphite flakes were directly exfoliated by ultrasonication in formic acid. A stable graphene aqueous dispersion was obtained using the as-produced GNPs after two processing steps: (i) chemical oxidation of GNPs to graphite oxide nanoplatelets (GONPs); and (ii) chemical reduction of graphite oxide nanoplatelets to graphene. The total duration for oxidation and production of stable graphite oxide colloid was significantly shortened due to the use of exfoliated GNPs with large surface area. The work proposed here has several advantages over the previous methods, including a high efficiency of exfoliation process, the use of a non-toxic, environmental-friendly intercalant and the capability for mass production of graphene for industrial applications.

KW - Exfoliation

KW - Formic acid

KW - Graphene

KW - Graphite nanoplatelet

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ER -

Preparation of graphite nanoplatelets and graphene sheets

Abstract

Keywords

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