Growth morphology and thermal stability of metal islands on graphene

Date
2012-01-01
Authors
Liu, Xiaojie
Hupalo, Myron
Thiel, Patricia
Wang, Cai-Zhuang
Lu, Wen-Cai
Thiel, Patricia
Ho, Kai-Ming
Tringides, Michael
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Chemistry
Organizational Unit
Journal Issue
Series
Department
Chemistry
Abstract

We performed an experiment to study the thermal stability of metal on graphene. We show that Fe, Gd, Dy, and Eu on graphene exhibit island growth morphology. The 3D islands of Fe, Gd, and Dy show a small decrease in island density and an increase in the height/width aspect ratio upon thermal annealing. By contrast, coarsening of Eu islands to a close flat film is observed after annealing to 365 K. By investigating the fundamental interactions (i.e., adsorption energies and diffusion barriers) between the metal adatoms and graphene using ab initio calculations, we predict that most of the 3d and group 10 transition metals, noble metals, as well as rare earth metals on graphene should exhibit a 3D growth mode as observed in experiment. Most of the metal nanostructures on graphene should also be stable against aggregation. The 3D morphology and strong thermal stability of Fe, Co, Ni, Pt, and Gd islands on graphene can serve as good candidates for surface-supported catalysis applications.

Comments

This article is from Physical Review B 86, no. 8 (2012): 081414, doi:10.1103/PhysRevB.86.081414.

Description
Keywords
Citation
DOI
Collections