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When do hydrocarbons dewet metal surfaces? The case of coronene on Cu(111)

Journal Article · · Surface Science

Here, we have used scanning tunneling microscopy and density functional theory calculations to study molecular layers of coronene on Cu(111). The structure and stability of these layers is determined by the balance between coronene-substrate and coronene-coronene interactions. Here, we characterize this balance by measuring the maximum coverage before coronene dewets the substrate to form three-dimensional islands. We find that coronene molecules lie parallel to the substrate at the maximum coverage, in contrast to previous observations of tilted coronene on metal surfaces. We attribute this previously reported tilt to a metastability caused by an activation barrier to nucleate three-dimensional islands.

Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1618083
Alternate ID(s):
OSTI ID: 1776229
Report Number(s):
SAND--2019-12819J; 680641
Journal Information:
Surface Science, Journal Name: Surface Science Vol. 700; ISSN 0039-6028
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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