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Issue 28, 2015
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Self-assembly of NiTPP on Cu(111): a transition from disordered 1D wires to 2D chiral domains

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Abstract

The growth and self-assembling properties of nickel-tetraphenyl porphyrins (NiTPP) on the Cu(111) surface are analysed via scanning tunnelling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT). For low coverage, STM results show that NiTPP molecules diffuse on the terrace until they reach the step edge of the copper surface forming a 1D system with disordered orientation along the step edges. The nucleation process into a 2D superstructure was observed to occur via the interaction of molecules attached to the already nucleated 1D structure, reorienting molecules. For monolayer range coverage a 2D nearly squared self-assembled array with the emergence of chiral domains was observed. The XPS results of the Ni 2p3/2 core levels exhibit a 2.6 eV chemical shift between the mono- and multilayer configuration of NiTPP. DFT calculations show that the observed chemical shifts of Ni 2p3/2 occur due to the interaction of 3d orbitals of Ni with the Cu(111) substrate.

Graphical abstract: Self-assembly of NiTPP on Cu(111): a transition from disordered 1D wires to 2D chiral domains

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Article information


Submitted
04 Mar 2015
Accepted
13 Jun 2015
First published
16 Jun 2015

Phys. Chem. Chem. Phys., 2015,17, 18344-18352
Article type
Paper
Author version available

Self-assembly of NiTPP on Cu(111): a transition from disordered 1D wires to 2D chiral domains

S. Fatayer, R. G. A. Veiga, M. J. Prieto, E. Perim, R. Landers, R. H. Miwa and A. de Siervo, Phys. Chem. Chem. Phys., 2015, 17, 18344
DOI: 10.1039/C5CP01288K

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