Self-Assembled Monolayers of Molecular Conductors with Terpyridine-Metal Redox Switching Elements: A Combined AFM, STM and Electrochemical Study
Status PubMed-not-MEDLINE Jazyk angličtina Země Švýcarsko Médium electronic
Typ dokumentu časopisecké články
Grantová podpora
21-13458S
Czech Science Foundation
RVO: 61388955
Czech Academy of Sciences
MA 2605/6-1
Deutsche Forschungsgemeinschaft
PubMed
36500413
PubMed Central
PMC9738775
DOI
10.3390/molecules27238320
PII: molecules27238320
Knihovny.cz E-zdroje
- Klíčová slova
- AFM, STM, electron transfer, redox switching, self-assembled monolayer,
- MeSH
- mikroskopie atomárních sil MeSH
- oxidace-redukce MeSH
- povrchové vlastnosti MeSH
- rastrovací tunelová mikroskopie * MeSH
- zlato * chemie MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- zlato * MeSH
Self-assembled monolayers (SAMs) of terpyridine-based transition metal (ruthenium and osmium) complexes, anchored to gold substrate via tripodal anchoring groups, have been investigated as possible redox switching elements for molecular electronics. An electrochemical study was complemented by atomic force microscopy (AFM) and scanning tunneling microscopy (STM) methods. STM was used for determination of the SAM conductance values, and computation of the attenuation factor β from tunneling current-distance curves. We have shown that SAMs of Os-tripod molecules contain larger adlayer structures compared with SAMs of Ru-tripod molecules, which are characterized by a large number of almost evenly distributed small islands. Furthermore, upon cyclic voltammetric experimentation, Os-tripod films rearrange to form a smaller number of even larger islands, reminiscent of the Ostwald ripening process. Os-tripod SAMs displayed a higher surface concentration of molecules and lower conductance compared with Ru-tripod SAMs. The attenuation factor of Os-tripod films changed dramatically, upon electrochemical cycling, to a higher value. These observations are in accordance with previously reported electron transfer kinetics studies.
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