Issue 29, 2012
From the journal:

Physical Chemistry Chemical Physics

Molecular orientation of terephthalic acidassembly on epitaxial graphene: NEXAFS and XPS study†

Wenhua Zhang,ab   Alexei Nefedov,a   Michael Naboka,a   Liang Caob  and  Christof Wöll*a  

* Corresponding authors

a Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
E-mail: zhangwh@ustc.edu.cn, alexei.nefedov@kit.edu, michael.naboka@kit.edu, christof.woell@kit.edu
Fax: +49 721 608 23478
Tel: +49 721 608 23934

b National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China (USTC), Hefei 230029, People's Republic of China
E-mail: zhangwh@ustc.edu.cn, lcao@mail.ustc.edu.cn
Fax: +86 551 5141078
Tel: +86 551 3602060

Abstract

The adsorption of terephthalic acid molecules [C6H4(COOH)2), TPA] on a single layer of graphene grown epitaxially on Ni(111) has been investigated by means of near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and X-ray photoelectron spectroscopy (XPS) at room temperature. The assignment of the NEXAFS resonances was aided by ab initio calculations for the free TPA molecule. For coverages up to a monolayer the molecular plane of TPA adopts a parallel orientation with regard to the epitaxial graphene (EG) layer. Deprotonation of TPA molecules at one monolayer coverage can be excluded. For TPA multilayers, the molecular plane is tilted on average by approximately 45° with respect to the sample surface.

Graphical abstract: Molecular orientation of terephthalic acid assembly on epitaxial graphene: NEXAFS and XPS study

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Article information

DOI
https://doi.org/10.1039/C2CP23748B
Article type
Paper
Submitted
26 Nov 2011
Accepted
17 May 2012
First published
18 May 2012

Phys. Chem. Chem. Phys., 2012,14, 10125-10131

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Molecular orientation of terephthalic acid assembly on epitaxial graphene: NEXAFS and XPS study

W. Zhang, A. Nefedov, M. Naboka, L. Cao and C. Wöll, Phys. Chem. Chem. Phys., 2012, 14, 10125 DOI: 10.1039/C2CP23748B

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