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

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...

Full description

Saved in:
Bibliographic Details
Published in:Nanoscale 2015-03, Vol.7 (11), p.4929-4934
Main Authors: Fang, Wenjing, Hsu, Allen, Shin, Yong Cheol, Liao, Albert, Huang, Shengxi, Song, Yi, Ling, Xi, Dresselhaus, Mildred S, Palacios, Tomas, Kong, Jing
Format: Article
Language:English
Subjects:
Carbon
Copper
Enclosures
Foils
Graphene
Monolayers
Multilayers
Tungsten
X-rays
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2040-3364
2040-3372
DOI:10.1039/c4nr07418a