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Article Dans Une Revue Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces Année : 2015

STM study of C60F18 high dipole moment molecules on Au(111)

Résumé

Scanning tunneling microscopy and spectroscopy studies of C60F18 molecules deposited on Au(111) are reported and compared to C-60 molecules both at liquid helium temperature and room temperature (RT). Whereas adsorption and electronic properties of C60F18 single molecules were studied at low temperature (LT), self-assemblies were investigated at RT. In both cases, the fluorine atoms of the C60F18 molecules are pointed towards the surface. Individual C60F18 molecules on Au(111) have a HOMO-LUMO gap of 2.9 eV. The self-assembled islands exhibit a close-packed hexagonal lattice with amorphous borders. The comparison with C-60 molecules clearly demonstrates the influence of the C60F15 electric dipole moment (EDM) on the electronic properties of single molecules and on the thermodynamics of self-assembled islands. Besides, the apparent height value of a separate molecule increases in a self-assembly environment as a result of a depolarization phenomenon. (C) 2015 Elsevier B.V. All rights reserved.
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hal-01987551 , version 1 (21-01-2019)

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  • HAL Id : hal-01987551 , version 1

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Kaushik Bairagi, Amandine Bellec, R. G. Chumakov, K. A. Menshikov, J. Lagoute, et al.. STM study of C60F18 high dipole moment molecules on Au(111). Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces, 2015, 641, pp.248-251. ⟨hal-01987551⟩
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