Surface energies, adhesion energies, and exfoliation energies relevant to copper-graphene and copper-graphite systems

Date
2019-01-24
Authors
Thiel, Patricia
Han, Yong
Lai, King
Lii-Rosales, Ann
Tringides, Michael
Evans, James
Thiel, Patricia
Evans, James
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Ames Laboratory
Organizational Unit
Physics and Astronomy
Organizational Unit
Chemistry
Organizational Unit
Journal Issue
Series
Department
Ames LaboratoryPhysics and AstronomyMaterials Science and EngineeringChemistry
Abstract

We have generated precise values for several key energies that are relevant to Cu-graphene or Cu-graphite systems. Such systems may find technological applications that range from graphene synthesis, to condensation heat transfer, to electrical contacts to graphene, to composites. Using density functional theory, we have calculated surface energies of the three low-index faces of bulk Cu. We find that these surface energies, calculated with the PBEsol functional, are significantly higher than with the more common PBE functional and agree more closely with experiment. We have also calculated the surface energies of graphene and graphite, the exfoliation energy between graphene and graphite, and the adhesion energies between graphene or graphite and a Cu(111) slab. The adhesion energy between a carbon layer and Cu(111) is close to the exfoliation energy and cleavage energy of graphite, the four sets of values spanning a range of only 0.394 to 0.456 J/m2. Our results are consistent with the earlier experimental observation of three-dimensional growth of Cu on top of graphite. The energies are also used to perform a continuum Winterbottom analysis and also discrete (atomistic) variants to predict the equilibrium shapes of Cu particles supported on graphite.

Comments

This is a manuscript of an article published as Han, Yong, King C. Lai, Ann Lii-Rosales, Michael C. Tringides, James W. Evans, and Patricia A. Thiel. "Surface energies, adhesion energies, and exfoliation energies relevant to copper-graphene and copper-graphite systems." Surface Science (2019). DOI: 10.1016/j.susc.2019.01.009. Posted with permission.

Description
Keywords
Citation
DOI
Collections