| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Adsorption of 1,3,5-Triphenylbenzene Molecules and Growth of Graphene Nanoflakes on Cu(100) Surface |
| Qiao-Yun Liu1, Jun-Jie Song2**, Yi-Liang Cai3, Dan Qiao1, Li-Wei Jing1, Pi-Mo He1, Han-Jie Zhang1** |
1Department of Physics, Zhejiang University, Hangzhou 310027
2School of Information Science and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100
3Department of Fundamental and Social Science, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018
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| Cite this article: |
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Qiao-Yun Liu, Jun-Jie Song, Yi-Liang Cai et al 2017 Chin. Phys. Lett. 34 116801 |
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Abstract Adsorption of 1,3,5-triphenylbenzene (TPB) molecules on Cu(100) surface is studied using ultraviolet photoelectron spectroscopy (UPS) and density functional theory (DFT) calculations. Researches on the bottom-up fabrication of graphene nanoflakes (GNFs) with TPB as a precursor on the Cu(100) surface are carried out based on UPS and DFT calculations. Three emission features $d$, $e$ and $f$ originating from the TPB molecules are located at 3.095, 7.326 and 9.349 eV below the Fermi level, respectively. With the increase of TPB coverage on the Cu(100) substrate, the work function decreases due to the formation of interfacial dipoles and charge (electron) rearrangement at the TPB/Cu(100) interface. Upon the formation of GNFs, five emission characteristic peaks of $g$, $h$, $i$, $j$ and $k$ originating from the GNFs are located at 1.100, 3.529, 6.984, 8.465 and 9.606 eV below the Fermi level, respectively. Angle resolved ultraviolet photoelectron spectroscopy (ARUPS) and DFT calculations indicate that TPB molecules adopt a lying-down configuration with their molecular plane nearly parallel to the Cu(100) substrate at the monolayer stage. At the same time, the lying-down configuration for the GNFs on the Cu(100) surface is also unveiled by ARUPS and DFT calculations.
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Received: 31 July 2017
Published: 25 October 2017
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| PACS: |
68.35.-p
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(Solid surfaces and solid-solid interfaces: structure and energetics)
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79.60.-i
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(Photoemission and photoelectron spectra)
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73.20.-r
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(Electron states at surfaces and interfaces)
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68.55.-a
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(Thin film structure and morphology)
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| Fund: Supported by the National Basic Research Program of China under Grant No 2011CB921903, and the Scientific Research Fund of Zhejiang Provincial Education Department under Grant Nos Y201121234 and LQ12F04001. |
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