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Issue 11, 2015
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Application of tungsten as a carbon sink for synthesis of large-domain uniform monolayer graphene free of bilayers/multilayers

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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.

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

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Supplementary files

Article information


Submitted
15 Dec 2014
Accepted
04 Feb 2015
First published
05 Feb 2015

Nanoscale, 2015,7, 4929-4934
Article type
Paper
Author version available

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

W. Fang, A. Hsu, Y. C. Shin, A. Liao, S. Huang, Y. Song, X. Ling, M. S. Dresselhaus, T. Palacios and J. Kong, Nanoscale, 2015, 7, 4929
DOI: 10.1039/C4NR07418A

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