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

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)4929-4934
Number of pages6
JournalNanoscale
Volume7
Issue number11
DOIs
StatePublished - Mar 21 2015

Fingerprint

Tungsten
Graphite
Enclosures
Graphene
Monolayers
Multilayers
Carbon
Metal foil
Carbides
Copper
Chemical vapor deposition
X ray photoelectron spectroscopy
X ray diffraction

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Fang, Wenjing ; Hsu, Allen ; Shin, Yong Cheol ; Liao, Albert ; Huang, Shengxi ; Song, Yi ; Ling, Xi ; Dresselhaus, Mildred S. ; Palacios, Tomas ; Kong, Jing. / Application of tungsten as a carbon sink for synthesis of large-domain uniform monolayer graphene free of bilayers/multilayers. In: Nanoscale. 2015 ; Vol. 7, No. 11. pp. 4929-4934.
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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.",
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Fang, W, Hsu, A, Shin, YC, Liao, A, Huang, S, Song, Y, Ling, X, Dresselhaus, MS, Palacios, T & Kong, J 2015, 'Application of tungsten as a carbon sink for synthesis of large-domain uniform monolayer graphene free of bilayers/multilayers', Nanoscale, vol. 7, no. 11, pp. 4929-4934. https://doi.org/10.1039/c4nr07418a

Application of tungsten as a carbon sink for synthesis of large-domain uniform monolayer graphene free of bilayers/multilayers. / Fang, Wenjing; Hsu, Allen; Shin, Yong Cheol; Liao, Albert; Huang, Shengxi; Song, Yi; Ling, Xi; Dresselhaus, Mildred S.; Palacios, Tomas; Kong, Jing.

In: Nanoscale, Vol. 7, No. 11, 21.03.2015, p. 4929-4934.

Research output: Contribution to journalArticle

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AU - Fang, Wenjing

AU - Hsu, Allen

AU - Shin, Yong Cheol

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AU - Song, Yi

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AU - Dresselhaus, Mildred S.

AU - Palacios, Tomas

AU - Kong, Jing

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