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

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this