Photoisomerization of azobenzene-substituted alkanethiolates on Au(111) substrates in the context of work function variation: the effect of structure and packing density
Photoisomerization of a series of custom-designed, azobenzene-substituted alkanethiolate (AT) self-assembled monolayers (SAMs) on Au(111) substrates was studied in the context of work function variation, using Kelvin probe measurements as a transduction technique. These SAMs featured variable packin...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
17th April 2019
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| In: |
Physical chemistry, chemical physics
Year: 2019, Volume: 21, Issue: 18, Pages: 9098-9105 |
| ISSN: | 1463-9084 |
| DOI: | 10.1039/c9cp00255c |
| Online Access: | Verlag, Volltext: https://doi.org/10.1039/c9cp00255c Verlag, Volltext: https://pubs.rsc.org/en/content/articlepdf/2019/cp/c9cp00255c 
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| Author Notes: | Swen Schuster, Matthias Fueser, Andika Asyuda, Piotr Cyganik, Andreas Terfort and Michael Zharnikov |
| Summary: | Photoisomerization of a series of custom-designed, azobenzene-substituted alkanethiolate (AT) self-assembled monolayers (SAMs) on Au(111) substrates was studied in the context of work function variation, using Kelvin probe measurements as a transduction technique. These SAMs featured variable packing density (by similar to 14%; due to the odd-even effects) and, as an option, were additionally decorated with the electron donating/withdrawing -CH3 and -CF3 tail group, respectively, which induce additional dipole moments. The efficiency of photoisomerization and the respective extent of work function variation (Delta Phi) were found to be quite low and independent of the packing density in the SAMs, within the given odd-even packing density variation. They could only be increased, up to ca. 40 meV for Delta Phi, by mixing the azobenzene-substituted ATs with shorter "matrix" molecules, which were introduced for a partial release of the sterical constraints. The Delta Phi values for the SAMs decorated with the -CH3 and -CF3 tail groups were found to be lower than those for the monolayers without such a decoration, which correlated well with the theoretical estimates for the change of the dipole moment of the relevant molecules upon the photoisomerization. |
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| Item Description: | Gesehen am 22.10.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1463-9084 |
| DOI: | 10.1039/c9cp00255c |