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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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2020-10-01
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| Series: | Beilstein Journal of Nanotechnology |
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| Online Access: | https://doi.org/10.3762/bjnano.11.134 |
| _version_ | 1819296465650974720 |
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| author | Feifei Xiang Tobias Schmitt Marco Raschmann M. Alexander Schneider |
| author_facet | Feifei Xiang Tobias Schmitt Marco Raschmann M. Alexander Schneider |
| author_sort | Feifei Xiang |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-24T04:58:33Z |
| format | Article |
| id | doaj.art-fbed7b4e5e894446a246648aec43a9ea |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-24T04:58:33Z |
| publishDate | 2020-10-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-fbed7b4e5e894446a246648aec43a9ea2022-12-21T17:14:19ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862020-10-011111516152410.3762/bjnano.11.1342190-4286-11-134Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100)Feifei Xiang0Tobias Schmitt1Marco Raschmann2M. Alexander Schneider3Solid State Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, GermanySolid State Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, GermanySolid State Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, GermanySolid State Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, GermanyPorphyrins 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.https://doi.org/10.3762/bjnano.11.134adsorption energymolecular rotorsporphyrinsself-assemblytransition metal oxides |
| spellingShingle | Feifei Xiang Tobias Schmitt Marco Raschmann M. Alexander Schneider Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100) Beilstein Journal of Nanotechnology adsorption energy molecular rotors porphyrins self-assembly transition metal oxides |
| 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 | adsorption energy molecular rotors porphyrins self-assembly transition metal oxides |
| url | https://doi.org/10.3762/bjnano.11.134 |
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