Journal
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
Volume 2, Issue -, Pages 674-680Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.2.72
Keywords
counterions; liquid-solid interface; macrocycles; scanning tunnelling microscopy; self-assembly
Funding
- Fund of Scientific Research-Flanders (FWO)
- Belgian Federal Science Policy Office [IAP-6/27]
- VolkswagenStiftung
- K. U. Leuven (GOA)
- [SFB 624]
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Despite their importance in self-assembly processes, the influence of charged counterions on the geometry of self-assembled organic monolayers and their direct localisation within the monolayers has been given little attention. Recently, various examples of self-assembled monolayers composed of charged molecules on surfaces have been reported, but no effort has been made to prove the presence of counterions within the monolayer. Here we show that visualisation and exact localisation of counterions within self-assembled monolayers can be achieved with scanning tunnelling microscopy (STM). The presence of charges on the studied shape-persistent macrocycles is shown to have a profound effect on the self-assembly process at the liquid- solid interface. Furthermore, preferential adsorption was observed for the uncharged analogue of the macrocycle on a surface.
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