Imperial College London
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ProfessorDimitriVvedensky

Faculty of Natural Sciences, Department of Physics

Professor of Physics
 
 
 
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Contact

 

+44 (0)20 7594 7605d.vvedensky Website

 
 
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Assistant

 

Mrs Carolyn Dale +44 (0)20 7594 7579

 
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Location

 

813Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Tetlow:2016:10.1039/c6cp03638d,
author = {Tetlow, H and Posthuma, de Boer J and Ford, IJ and Vvedensky, DD and Curcio, D and Omiciuolo, L and Lizzit, S and Baraldi, A and Kantorovich, L},
doi = {10.1039/c6cp03638d},
journal = {Physical Chemistry Chemical Physics},
pages = {27897--27909},
title = {Ethylene decomposition on Ir(111): initial path to graphene formation.},
url = {http://dx.doi.org/10.1039/c6cp03638d},
volume = {18},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The complete mechanism behind the thermal decomposition of ethylene (C2H4) on Ir(111), which is the first step of graphene growth, is established for the first time employing a combination of experimental and theoretical methods. High-resolution X-ray photoelectron spectroscopy was employed, along with calculations of core level binding-energies, to identify the surface species and their evolution as the surface temperature is increased. To understand the experimental results, we have developed a reaction sequence between the various CnHm species, from ethylene to C monomers and dimers, based on ab initio density functional calculations of all the energy barriers and the Arrhenius prefactors for the most important processes. The resulting temperature evolution of all species obtained from the simulated kinetics of ethylene decomposition agrees with photoemission measurements. The molecular dissociation mechanism begins with the dehydrogenation of ethylene to vinylidene (CH2C), which is then converted to acetylene (CHCH) by the removal and addition of an H atom. The C-C bond is then broken to form methylidyne (CH), and in the same temperature range a small amount of ethylidyne (CH3C) is produced. Finally methylidyne dehydrogenates to produce C monomers that are available for the early stage nucleation of the graphene islands.
AU  - Tetlow,H
AU  - Posthuma,de Boer J
AU  - Ford,IJ
AU  - Vvedensky,DD
AU  - Curcio,D
AU  - Omiciuolo,L
AU  - Lizzit,S
AU  - Baraldi,A
AU  - Kantorovich,L
DO  - 10.1039/c6cp03638d
EP  - 27909
PY  - 2016///
SN  - 1463-9084
SP  - 27897
TI  - Ethylene decomposition on Ir(111): initial path to graphene formation.
T2  - Physical Chemistry Chemical Physics
UR  - http://dx.doi.org/10.1039/c6cp03638d
UR  - http://www.ncbi.nlm.nih.gov/pubmed/27711652
UR  - http://hdl.handle.net/10044/1/42547
VL  - 18
ER  -
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