Title
Non-equilibrium growth of metal clusters on a layered material: Cu on MoS2
Publication Date
5-20-2020
Department
Chemistry; Materials Science and Engineering; Electrical and Computer Engineering; Mathematics; Physics and Astronomy; Ames Laboratory; Office of Biotechnology
Campus Units
Ames Laboratory, Chemistry, Electrical and Computer Engineering, Materials Science and Engineering, Mathematics, Physics and Astronomy, Office of Biotechnology
OSTI ID+
1630369
Report Number
IS-J 10180
DOI
10.1088/1367-2630/ab84b5
Journal Title
New Journal of Physics
Volume Number
22
First Page
053033
Abstract
We use a variety of experimental techniques to characterize Cu clusters on bulk MoS2 formed via physical vapor deposition of Cu in ultrahigh vacuum, at temperatures ranging from 300 K to 900 K. We find that large facetted clusters grow at elevated temperatures, using high Cu exposures. The cluster size distribution is bimodal, and under some conditions, large clusters are surrounded by a denuded zone. We propose that defect-mediated nucleation, and coarsening during deposition, are both operative in this system. At 780 K, a surprising type of facetted cluster emerges, and at 900 K this type predominates: pyramidal clusters with a triangular base, exposing (311) planes as side facets. This is a growth shape, rather than an equilibrium shape.
DOE Contract Number(s)
AC02-07CH11358
Language
en
Department of Energy Subject Categories
36 MATERIALS SCIENCE
Publisher
Iowa State University Digital Repository, Ames IA (United States)
