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Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100)

Porphyrins represent a versatile class of molecules, the adsorption behavior of which on solid surfaces is of fundamental interest due to a variety of potential applications. We investigate here the molecule–molecule and molecule–substrate interaction of Co-5,15-diphenylporphyrin (Co-DPP) and 2H-tet...

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Autores principales: Xiang, Feifei, Schmitt, Tobias, Raschmann, Marco, Schneider, M Alexander
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7554680/
https://www.ncbi.nlm.nih.gov/pubmed/33094085
http://dx.doi.org/10.3762/bjnano.11.134
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author Xiang, Feifei
Schmitt, Tobias
Raschmann, Marco
Schneider, M Alexander
author_facet Xiang, Feifei
Schmitt, Tobias
Raschmann, Marco
Schneider, M Alexander
author_sort Xiang, Feifei
collection PubMed
description Porphyrins represent a versatile class of molecules, the adsorption behavior of which on solid surfaces is of fundamental interest due to a variety of potential applications. We investigate here the molecule–molecule and molecule–substrate interaction of Co-5,15-diphenylporphyrin (Co-DPP) and 2H-tetrakis(p-cyanophenyl)porphyrin (2H-TCNP) on one bilayer (1BL) and two bilayer (2BL) thick cobalt oxide films on Ir(100) by scanning tunneling microscopy (STM) and density functional theory (DFT). The two substrates differ greatly with respect to their structural and potential-energy landscape corrugation with immediate consequences for adsorption and self-assembly of the molecules studied. On both films, an effective electronic decoupling from the metal substrate is achieved. However, on the 1BL film, Co-DPP molecules are sufficiently mobile at 300 K and coalesce to self-assembled molecular islands when cooled to 80 K despite their rather weak intermolecular interaction. In contrast, on the 2BL film, due to the rather flat potential landscape, molecular rotation is thermally activated, which effectively prevents self-assembly. The situation is different for 2H-TCNPP, which, due to the additional functional anchoring groups, does not self-assemble on the 1BL film but forms self-assembled compact islands on the 2BL film. The findings demonstrate the guiding effect of the cobalt oxide films of different thickness and the effect of functional surface anchoring.
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spelling pubmed-75546802020-10-21 Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100) Xiang, Feifei Schmitt, Tobias Raschmann, Marco Schneider, M Alexander Beilstein J Nanotechnol Full Research Paper Porphyrins represent a versatile class of molecules, the adsorption behavior of which on solid surfaces is of fundamental interest due to a variety of potential applications. We investigate here the molecule–molecule and molecule–substrate interaction of Co-5,15-diphenylporphyrin (Co-DPP) and 2H-tetrakis(p-cyanophenyl)porphyrin (2H-TCNP) on one bilayer (1BL) and two bilayer (2BL) thick cobalt oxide films on Ir(100) by scanning tunneling microscopy (STM) and density functional theory (DFT). The two substrates differ greatly with respect to their structural and potential-energy landscape corrugation with immediate consequences for adsorption and self-assembly of the molecules studied. On both films, an effective electronic decoupling from the metal substrate is achieved. However, on the 1BL film, Co-DPP molecules are sufficiently mobile at 300 K and coalesce to self-assembled molecular islands when cooled to 80 K despite their rather weak intermolecular interaction. In contrast, on the 2BL film, due to the rather flat potential landscape, molecular rotation is thermally activated, which effectively prevents self-assembly. The situation is different for 2H-TCNPP, which, due to the additional functional anchoring groups, does not self-assemble on the 1BL film but forms self-assembled compact islands on the 2BL film. The findings demonstrate the guiding effect of the cobalt oxide films of different thickness and the effect of functional surface anchoring. Beilstein-Institut 2020-10-05 /pmc/articles/PMC7554680/ /pubmed/33094085 http://dx.doi.org/10.3762/bjnano.11.134 Text en Copyright © 2020, Xiang et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Full Research Paper
Xiang, Feifei
Schmitt, Tobias
Raschmann, Marco
Schneider, M Alexander
Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100)
title Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100)
title_full Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100)
title_fullStr Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100)
title_full_unstemmed Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100)
title_short Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100)
title_sort adsorption and self-assembly of porphyrins on ultrathin coo films on ir(100)
topic Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7554680/
https://www.ncbi.nlm.nih.gov/pubmed/33094085
http://dx.doi.org/10.3762/bjnano.11.134
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