期刊
PHYSICAL REVIEW LETTERS
卷 103, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.256102
关键词
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资金
- National Science Foundation [EEC-0425914]
- DARPA N/MEMS Science and Technology Fundamentals Center on Interfacial Engineering for MEMS
- National Center for Electron Microscopy
- Lawrence Berkeley National Laboratory
- U.S. Department of Energy [DE-AC02-05CH11231]
The spreading of a bilayer gold film propagating outward from gold clusters, which are pinned to clean Si(111), is imaged in real time by low-energy electron microscopy. By monitoring the evolution of the boundary of the gold film at fixed temperature, a linear dependence of the spreading radius on time is found. The measured spreading velocities in the temperature range of 800 < T < 930 K varied from below 100 pm/s to 50 nm/s. We show that the spreading rate is limited by the reaction to form Au silicide, and the spreading velocity is likely regulated by the reconstruction of the gold silicide that occurs at the interface.
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