Application of tungsten as a carbon sink for synthesis of large-domain uniform monolayer graphene free of bilayers/multilayers

Wenjing Fang; Allen Hsu; Yong Cheol Shin; Albert Liao; Shengxi Huang; Yi Song; Xi Ling; Mildred S. Dresselhaus; Tomas Palacios; Jing Kong

doi:10.1039/c4nr07418a

Application of tungsten as a carbon sink for synthesis of large-domain uniform monolayer graphene free of bilayers/multilayers

Wenjing Fang, Allen Hsu, Yong Cheol Shin, Albert Liao, Shengxi Huang, Yi Song, Xi Ling, Mildred S. Dresselhaus, Tomas Palacios, Jing Kong

Electrical Engineering

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

13 Scopus citations

Abstract

We have found that tungsten (W) foils can be used for controlling the carbon diffusion within copper (Cu) enclosures to synthesize large-domain bi-/multi-layer-free monolayer graphene via chemical vapor deposition. We have observed that bi-/multi-layer graphene that nucleate underneath the monolayer graphene can be selectively removed by a W foil placed inside of the Cu enclosure. Both X-ray photoelectron spectroscopy and X-ray diffraction reveal the formation of tungsten sub-carbide (W₂C), suggesting the role of the W foil as a carbon sink that alters the carbon concentration inside of the enclosure. Consequently, the bi-/multi-layers appear to dissolve. Utilizing this selective removal process, we were able to demonstrate large-domain (>200 μm) monolayer graphene that is free of any bi-/multi-layers by using Cu double enclosures.

Original language	English (US)
Pages (from-to)	4929-4934
Number of pages	6
Journal	Nanoscale
Volume	7
Issue number	11
DOIs	https://doi.org/10.1039/c4nr07418a
State	Published - Mar 21 2015

All Science Journal Classification (ASJC) codes

General Materials Science

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10.1039/c4nr07418a

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title = "Application of tungsten as a carbon sink for synthesis of large-domain uniform monolayer graphene free of bilayers/multilayers",

abstract = "We have found that tungsten (W) foils can be used for controlling the carbon diffusion within copper (Cu) enclosures to synthesize large-domain bi-/multi-layer-free monolayer graphene via chemical vapor deposition. We have observed that bi-/multi-layer graphene that nucleate underneath the monolayer graphene can be selectively removed by a W foil placed inside of the Cu enclosure. Both X-ray photoelectron spectroscopy and X-ray diffraction reveal the formation of tungsten sub-carbide (W2C), suggesting the role of the W foil as a carbon sink that alters the carbon concentration inside of the enclosure. Consequently, the bi-/multi-layers appear to dissolve. Utilizing this selective removal process, we were able to demonstrate large-domain (>200 μm) monolayer graphene that is free of any bi-/multi-layers by using Cu double enclosures.",

author = "Wenjing Fang and Allen Hsu and Shin, {Yong Cheol} and Albert Liao and Shengxi Huang and Yi Song and Xi Ling and Dresselhaus, {Mildred S.} and Tomas Palacios and Jing Kong",

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T1 - Application of tungsten as a carbon sink for synthesis of large-domain uniform monolayer graphene free of bilayers/multilayers

AU - Fang, Wenjing

AU - Hsu, Allen

AU - Shin, Yong Cheol

AU - Liao, Albert

AU - Huang, Shengxi

AU - Song, Yi

AU - Ling, Xi

AU - Dresselhaus, Mildred S.

AU - Palacios, Tomas

AU - Kong, Jing

PY - 2015/3/21

Y1 - 2015/3/21

N2 - We have found that tungsten (W) foils can be used for controlling the carbon diffusion within copper (Cu) enclosures to synthesize large-domain bi-/multi-layer-free monolayer graphene via chemical vapor deposition. We have observed that bi-/multi-layer graphene that nucleate underneath the monolayer graphene can be selectively removed by a W foil placed inside of the Cu enclosure. Both X-ray photoelectron spectroscopy and X-ray diffraction reveal the formation of tungsten sub-carbide (W2C), suggesting the role of the W foil as a carbon sink that alters the carbon concentration inside of the enclosure. Consequently, the bi-/multi-layers appear to dissolve. Utilizing this selective removal process, we were able to demonstrate large-domain (>200 μm) monolayer graphene that is free of any bi-/multi-layers by using Cu double enclosures.

AB - We have found that tungsten (W) foils can be used for controlling the carbon diffusion within copper (Cu) enclosures to synthesize large-domain bi-/multi-layer-free monolayer graphene via chemical vapor deposition. We have observed that bi-/multi-layer graphene that nucleate underneath the monolayer graphene can be selectively removed by a W foil placed inside of the Cu enclosure. Both X-ray photoelectron spectroscopy and X-ray diffraction reveal the formation of tungsten sub-carbide (W2C), suggesting the role of the W foil as a carbon sink that alters the carbon concentration inside of the enclosure. Consequently, the bi-/multi-layers appear to dissolve. Utilizing this selective removal process, we were able to demonstrate large-domain (>200 μm) monolayer graphene that is free of any bi-/multi-layers by using Cu double enclosures.

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ER -

Application of tungsten as a carbon sink for synthesis of large-domain uniform monolayer graphene free of bilayers/multilayers

Abstract

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