Journal
NANO RESEARCH
Volume 2, Issue 6, Pages 509-516Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-009-9059-y
Keywords
Graphene; chemical vapor deposition; nickel catalyst; carbon nanomaterials
Categories
Funding
- Materials, Structures and Devices (MSD) Focus Center
- [NSF/CTS 05-06830]
- [NSF/DMR07-04197]
- [NSF-CHE 0111370]
- [NIH-RR02594]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0845358] Funding Source: National Science Foundation
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We report graphene films composed mostly of one or two layers of graphene grown by controlled carbon precipitation on the surface of polycrystalline Ni thin films during atmospheric chemical vapor deposition (CVD). Controlling both the methane concentration during CVD and the substrate cooling rate during graphene growth can significantly improve the thickness uniformity. As a result, one- or two- layer graphene regions occupy up to 87% of the film area. Single layer coverage accounts for 5%-11% of the overall film. These regions expand across multiple grain boundaries of the underlying polycrystalline Ni film. The number density of sites with multilayer graphene/graphite (>2 layers) is reduced as the cooling rate decreases. These films can also be transferred to other substrates and their sizes are only limited by the sizes of the Ni film and the CVD chamber. Here, we demonstrate the formation of films as large as 1 in(2). These findings represent an important step towards the fabrication of large-scale high-quality graphene samples.
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