Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 124, Issue 13, Pages 7492-7499Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b12056
Keywords
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Funding
- NSF [CHE-1507223]
- U.S. Department of Energy (USDOE), Office of Science, Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences through the Ames Laboratory Chemical Physics program
- USDOE [DE-AC02-07CH11358]
- National Science Foundation [ACI-1548562]
- USDOE Office of Science [DE-AC02-05CH11231]
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Au(111) surfaces play a central role in many applications, yet studies of fundamental aspects of their dynamics are limited. Thus, using scanning tunneling microscopy (STM) at 300 K, we analyze the coarsening of first-layer 2D Au islands directly on the Au(111) substrate and also of second-layer 2D Au islands. Specifically, we monitor the decay of Au first-layer islands with areas of about 100-500 nm(2) in the vicinity of larger islands or extended step edges over a period of approximately 40 h, the relevant time scale for this process. Experimentally observed behavior is captured by analytical theory for terrace-diffusion-limited decay incorporating DFT results for the Au terrace diffusion barrier and the adatom formation energy. Experimental observations of second-layer island decay are also compared with appropriate analytical theory and stochastic simulations, thereby determining the effective Ehrlich-Schwoebel barrier for Au on Au(111).
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