Bottom-up fabrication of graphene on Ru(0001) via molecular self-assembly
| Autor: | A U Rehman, Yiliang Cai, Hanjie Zhang, Pimo He, Junjie Song, Yuxi Zhang |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Annealing (metallurgy) Graphene Mechanical Engineering Bioengineering Nanotechnology General Chemistry law.invention Adsorption Chemical engineering Mechanics of Materials law Molecule Molecular self-assembly General Materials Science Dehydrogenation Density functional theory Electrical and Electronic Engineering Quantum tunnelling |
| Zdroj: | Nanotechnology. 26:295601 |
| ISSN: | 1361-6528 0957-4484 |
| DOI: | 10.1088/0957-4484/26/29/295601 |
| Popis: | A bottom-up fabrication of graphene via molecular self-assembly of p-Terphenyl on Ru(0001) has been investigated by scanning tunneling microcopy and density functional theory. Upon annealing of the sample at 450 °C, the intermediate stage is observed, in which the adsorbed p-Terphenyl molecules and graphitized flakes converted from the molecules coexist, implying the onset of dehydrogenation of p-Terphenyl. At the annealing temperature of 480 °C, the graphitized flakes start to convert into graphene. An adsoption energy of 5.99 eV is calculated for an individual p-Terphenyl molecule on Ru(0001), denoting a strong interaction between the adsorbate and substrate. The intermolecular interaction brings an extra adsorption energy of 0.28 eV for each molecule in the di-molecule adsorption system. During the conversion process from adsorbed molecule into graphene, the intermolecular interaction leads to the increase of the dehydrogenation barrier from 1.52 to 1.64 eV. |
| Databáze: | OpenAIRE |
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