Preparation of Quasi-Free-Standing Graphene with a Super Large Interlayer Distance by Methane Intercalation

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Preparation of high quality graphene with uniform layers currently remains a bottleneck. In particular, graphene with only one large-sized monolayer is very difficult to obtain. With epitaxial growth of graphene under a hydrogen atmosphere and high temperature, even as high as 1550 degrees C, the obtained graphene was intercalated by methane and methyl group (-CH(3)) species. Spontaneously, this intercalation makes the coupling of adjacent layers weak and leads to each layer behaving like free-standing graphene. X-ray diffraction spectra demonstrate that the interdistance of adjacent layers is abnormally large, disclosing each layer suspended by the intercalation, regardless of the layer number. Our findings have opened a possible route to prepare free-standing, high quality graphene effectively in large-scale, behaving like one monolayer free-standing graphene. The Raman spectra also support this conclusion.
Publisher
AMER CHEMICAL SOC
Issue Date
2011
Language
English
Article Type
Article
Keywords

EPITAXIAL GRAPHENE; RAMAN-SPECTROSCOPY; CARBON NANOTUBES; ELECTRONIC-PROPERTIES; BILAYER GRAPHENE; LAYER GRAPHENE; SINGLE-LAYER; WAFER-SCALE; HYDROGEN; NANORIBBONS

Citation

JOURNAL OF PHYSICAL CHEMISTRY C, v.115, no.42, pp.20538 - 20545

ISSN
1932-7447
URI
http://hdl.handle.net/10203/99926
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