Self-Assembled Monolayers of Molecular Conductors with Terpyridine-Metal Redox Switching Elements: A Combined AFM, STM and Electrochemical Study
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 atomi...
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Published in | Molecules (Basel, Switzerland) Vol. 27; no. 23; p. 8320 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
MDPI AG
29.11.2022
MDPI |
Subjects | |
Online Access | Get full text |
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Summary: | 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
molecules contain larger adlayer structures compared with SAMs of
molecules, which are characterized by a large number of almost evenly distributed small islands. Furthermore, upon cyclic voltammetric experimentation,
films rearrange to form a smaller number of even larger islands, reminiscent of the Ostwald ripening process.
SAMs displayed a higher surface concentration of molecules and lower conductance compared with
SAMs. The attenuation factor of
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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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Dedicated to Christian Amatore and Anny Jutand for their great contribution to molecular electrochemistry. |
ISSN: | 1420-3049 1420-3049 |
DOI: | 10.3390/molecules27238320 |