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)

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