期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 1, 期 20, 页码 3101-3107出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz1011466
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类别
资金
- Focus Center Research Program (FCRP)
- Center on Functional Engineered Nano Architectonics (FENA)
- Joint King Abdulaziz City for Science & Technology/California Center of Excellence on Nano Science and Engineering for Green and Clean Technologies.
We report a comparative study and Raman characterization of the formation of graphene on single crystal Ni (111) and polycrystalline Ni substrates using chemical vapor deposition (CVD). Preferential formation of monolayer/bilayer graphene on the single crystal surface is attributed to its atomically smooth surface and the absence of grain boundaries. In contrast, CVD graphene formed on polycrystalline Ni leads to a higher percentage of multilayer graphene (<= 3 layers), which is attributed to the presence of grain boundaries in Ni that can serve as nucleation sites for multilayer growth. Micro-Raman surface mapping reveals that the area percentages of monolayer/bilayer graphene are 91.4% for the Ni (111) substrate and 72.8% for the polycrystalline Ni-substrate under comparable CVD conditions. The use of single crystal substrates for graphene growth may open ways for uniform high-quality graphene over large areas.
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