Adsorption of n-butyl-substituted tetrathiafulvalene dodecanethiol on gold

• Published in: Journal of colloid and interface science Vol. 287; no. 2; pp. 388 - 393
• Main Authors: Petoral, Rodrigo M., Wermelin, Karin, Dahlstedt, Emma, Hellberg, Jonas, Uvdal, Kajsa
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 15.07.2005; Elsevier
• Subjects: Chemistry; Cyclic voltammetry; Exact sciences and technology; General and physical chemistry; IRAS; Kemi; NATURAL SCIENCES; NATURVETENSKAP; Surface physical chemistry; Tetrathiafulvalenes; Thiols; XPS; Cyclic voltammetry; IRAS; XPS; Thiols; Tetrathiafulvalenes; Gold; Thiol; Adsorption; Photoelectron spectrometry; Tetrathiafulvalene derivatives; Transition metal; X ray
• ISSN: 0021-9797; 1095-7103; 1095-7103
• DOI: 10.1016/j.jcis.2005.02.046

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 π-system such as TTF, are promising for thin-film field effect transistor application.