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Transport through Redox-Active Ru-Terpyridine Complexes Integrated in Single Nanoparticle Devices

  • Transition metal complexes are electrofunctional molecules due to their high conductivity and their intrinsic switching ability involving a metal-to-ligand charge transfer. Here, a method is presented to contact reliably a few to single redox-active Ru-terpyridine complexes in a CMOS compatible nanodevice and preserve their electrical functionality. Using hybrid materials from 14 nm gold nanoparticles (AuNP) and bis-{4′-[4-(mercaptophenyl)-2,2′:6′,2″-terpyridine]}-ruthenium(II) complexes a device size of 30² nm² inclusive nanoelectrodes is achieved. Moreover, this method bears the opportunity for further downscaling. The Ru-complex AuNP devices show symmetric and asymmetric current versus voltage curves with a hysteretic characteristic in two well separated conductance ranges. By theoretical approximations based on the single-channel Landauer model, the charge transport through the formed double-barrier tunnel junction is thoroughly analyzed and its sensibility to the molecule/metal contact is revealed. It can be verified that tunneling transport through the HOMO is the main transport mechanism while decoherent hopping transport is present to a minor extent.

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Metadaten
Author:Max Mennicken, Sophia K. Peter, Corinna Kaulen, Ulrich Simon, Silvia Karthäuser
DOI:https://doi.org/10.1021/acs.jpcc.9b11716
ISSN:1932-7455
Parent Title (English):The Journal of Physical Chemistry C
Publisher:ACS Publications
Place of publication:Washington, DC
Document Type:Article
Language:English
Year of Completion:2020
Date of the Publication (Server):2020/03/09
Volume:124
Issue:8
First Page:4881
Last Page:4889
Link:https://doi.org/10.1021/acs.jpcc.9b11716
Zugriffsart:campus
Institutes:FH Aachen / Fachbereich Medizintechnik und Technomathematik
FH Aachen / INB - Institut für Nano- und Biotechnologien
collections:Verlag / ACS Publications