Single-molecular diffusivity and long jumps of large organic molecules: CoPc on Ag(100)
Energy dissipation and the transfer rate of adsorbed molecules do not only determine the rates of chemical reactions but are also a key factor that often dictates the growth of organic thin films. Here, we present a study of the surface dynamical motion of cobalt phthalocyanine (CoPc) on Ag(100) in...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-02-01
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| Series: | Frontiers in Chemistry |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fchem.2024.1355350/full |
| _version_ | 1797323598957903872 |
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| author | Agata Sabik Agata Sabik John Ellis Holly Hedgeland David J. Ward Andrew P. Jardine William Allison Grażyna Antczak Anton Tamtögl |
| author_facet | Agata Sabik Agata Sabik John Ellis Holly Hedgeland David J. Ward Andrew P. Jardine William Allison Grażyna Antczak Anton Tamtögl |
| author_sort | Agata Sabik |
| collection | DOAJ |
| description | Energy dissipation and the transfer rate of adsorbed molecules do not only determine the rates of chemical reactions but are also a key factor that often dictates the growth of organic thin films. Here, we present a study of the surface dynamical motion of cobalt phthalocyanine (CoPc) on Ag(100) in reciprocal space based on the helium spin-echo technique in comparison with previous scanning tunnelling microscopy studies. It is found that the activation energy for lateral diffusion changes from 150 meV at 45–50 K to ≈100 meV at 250–350 K, and that the process goes from exclusively single jumps at low temperatures to predominantly long jumps at high temperatures. We thus illustrate that while the general diffusion mechanism remains similar, upon comparing the diffusion process over widely divergent time scales, indeed different jump distributions and a decrease of the effective diffusion barrier are found. Hence a precise molecular-level understanding of dynamical processes and thin film formation requires following the dynamics over the entire temperature scale relevant to the process. Furthermore, we determine the diffusion coefficient and the atomic-scale friction of CoPc and establish that the molecular motion on Ag(100) corresponds to a low friction scenario as a consequence of the additional molecular degrees of freedom. |
| first_indexed | 2024-03-08T05:30:57Z |
| format | Article |
| id | doaj.art-7a6a1c7ada034816b8a9285668dcd68f |
| institution | Directory Open Access Journal |
| issn | 2296-2646 |
| language | English |
| last_indexed | 2024-03-08T05:30:57Z |
| publishDate | 2024-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj.art-7a6a1c7ada034816b8a9285668dcd68f2024-02-06T05:01:37ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462024-02-011210.3389/fchem.2024.13553501355350Single-molecular diffusivity and long jumps of large organic molecules: CoPc on Ag(100)Agata Sabik0Agata Sabik1John Ellis2Holly Hedgeland3David J. Ward4Andrew P. Jardine5William Allison6Grażyna Antczak7Anton Tamtögl8Institute of Experimental Physics, University of Wrocław, Wrocław, PolandDepartment of Semiconductor Materials Engineering, Wrocław University of Science and Technology, Wrocław, PolandCavendish Laboratory, Cambridge, United KingdomCavendish Laboratory, Cambridge, United KingdomCavendish Laboratory, Cambridge, United KingdomCavendish Laboratory, Cambridge, United KingdomCavendish Laboratory, Cambridge, United KingdomInstitute of Experimental Physics, University of Wrocław, Wrocław, PolandInstitute of Experimental Physics, Graz University of Technology, Graz, AustriaEnergy dissipation and the transfer rate of adsorbed molecules do not only determine the rates of chemical reactions but are also a key factor that often dictates the growth of organic thin films. Here, we present a study of the surface dynamical motion of cobalt phthalocyanine (CoPc) on Ag(100) in reciprocal space based on the helium spin-echo technique in comparison with previous scanning tunnelling microscopy studies. It is found that the activation energy for lateral diffusion changes from 150 meV at 45–50 K to ≈100 meV at 250–350 K, and that the process goes from exclusively single jumps at low temperatures to predominantly long jumps at high temperatures. We thus illustrate that while the general diffusion mechanism remains similar, upon comparing the diffusion process over widely divergent time scales, indeed different jump distributions and a decrease of the effective diffusion barrier are found. Hence a precise molecular-level understanding of dynamical processes and thin film formation requires following the dynamics over the entire temperature scale relevant to the process. Furthermore, we determine the diffusion coefficient and the atomic-scale friction of CoPc and establish that the molecular motion on Ag(100) corresponds to a low friction scenario as a consequence of the additional molecular degrees of freedom.https://www.frontiersin.org/articles/10.3389/fchem.2024.1355350/fullsurface diffusionenergy dissipationsingle-molecule studiesorganic thin filmsatom-surface satteringfriction |
| spellingShingle | Agata Sabik Agata Sabik John Ellis Holly Hedgeland David J. Ward Andrew P. Jardine William Allison Grażyna Antczak Anton Tamtögl Single-molecular diffusivity and long jumps of large organic molecules: CoPc on Ag(100) Frontiers in Chemistry surface diffusion energy dissipation single-molecule studies organic thin films atom-surface sattering friction |
| title | Single-molecular diffusivity and long jumps of large organic molecules: CoPc on Ag(100) |
| title_full | Single-molecular diffusivity and long jumps of large organic molecules: CoPc on Ag(100) |
| title_fullStr | Single-molecular diffusivity and long jumps of large organic molecules: CoPc on Ag(100) |
| title_full_unstemmed | Single-molecular diffusivity and long jumps of large organic molecules: CoPc on Ag(100) |
| title_short | Single-molecular diffusivity and long jumps of large organic molecules: CoPc on Ag(100) |
| title_sort | single molecular diffusivity and long jumps of large organic molecules copc on ag 100 |
| topic | surface diffusion energy dissipation single-molecule studies organic thin films atom-surface sattering friction |
| url | https://www.frontiersin.org/articles/10.3389/fchem.2024.1355350/full |
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