期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 9, 页码 4759-4768出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp508177k
关键词
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资金
- National Science Foundation [DMR-0421152, CHE-0718657]
- University of Virginia NanoStar Seed Fund
- GAUK [339311]
The nucleation and growth of graphene islands on a Pt(111) surface were examined at temperatures near 1000 K. Graphene was grown by chemical vapor deposition of ethylene, and a low-energy electron microscope (LEEM) was used to image the growing graphene islands with resolution of 10 nm and to perform spatially localized electron diffraction. It is shown that graphene grows bidirectionally over the Step edges of Pt, and its formation can induce substantial changes in the platinum surface morphology. Average sire and density of graphene islands strongly depend on surface temperature during deposition. Postdosing Auger electron spectroscopy was employed as a complementary macroscopic technique to measure the total carbon deposited as a result of ethylene dissociative sticking and decomposition. The initial dissociative sticking coefficient S-0(T-g = 300 K, T-s ) for ethylene was found to decrease with increasing Surface temperature until a temperature of T-s = 850 K was reached whereupon it increased with temperature.
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