Adsorption of n-butyl-substituted tetrathiafulvalene dodecanethiol on gold.
Tetrathiafulvalene (TTF) derivative substituted with two butyl- and two dodecylthiol chains is adsorbed on polycrystalline gold. The TTF-derived thiol adsorbates were characterized by ellipsometry, contact angle goniometry, infrared and X-ray photoelectron spectroscopy and cyclic voltammetry. The molecule is strongly anchored on the gold surface through the sulfur terminating the alkylthiol chains. On the average, the TTF moiety is oriented extended away from the gold surface. The topmost layer of the film containing the dibutyl chains is disordered with gauche defects. The molecule was organized with majority of the alkylthiol chains bound to the gold surface. There are indications of pinholes in the monolayer due to steric hindrance of the bulky TTF rings. The molecular systems consisting of an electroactive pi-system such as TTF, are promising for thin-film field effect transistor application.
Petoral
Rodrigo M
RM
Laboratory of Applied Physics, Department of Physics and Measurement Technology, Linköping University, SE-581 83 Linköping, Sweden.
Wermelin
Karin
K
Dahlstedt
Emma
E
Hellberg
Jonas
J
Uvdal
Kajsa
K