期刊
PHYSICAL REVIEW B
卷 86, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.235413
关键词
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资金
- National Science Foundation [DMR-1006411]
- NSF
- SEMATECH
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006411] Funding Source: National Science Foundation
The growth of graphene by catalytic decomposition of ethylene on Cu(111) in an ultrahigh vacuum system was investigated with low-energy electron diffraction, low-energy electron microscopy, and atomic force microscopy. Attempts to form a graphene overlayer using ethylene at pressures as high as 10 mTorr and substrate temperatures as high as 900 degrees C resulted in almost no graphene growth. By using an argon overpressure, the growth of epitaxial graphene on Cu(111) was achieved. The suppression of graphene growth without the use of an argon overpressure is attributed to Cu sublimation at elevated temperatures. During the initial stages of growth, a random distribution of rounded graphene islands is observed. The predominant rotational orientation of the islands is within +/- 1 degrees of the Cu(111) substrate lattice.
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