کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5424950 | 1395842 | 2007 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A novel fullerene lipoic acid derivative: Synthesis and preparation of self-assembled monolayers on gold A novel fullerene lipoic acid derivative: Synthesis and preparation of self-assembled monolayers on gold](/preview/png/5424950.png)
Synthesis and preparation of self-assembled monolayers of a novel fullerene lipoic acid derivative on gold are reported. The presence of densely packed SAMs was confirmed by ellipsometry and cyclic voltammetry. The electrochemical response of the modified electrode in organic media exhibits the first two redox peaks characteristic of the extended Ï-electron system of fullerene. C60 surface coverage (1.4 Ã 10â10 mol cmâ2) has been electrochemically determined by the redox process of the adsorbed fullerene moiety and by reductive desorption of the SAM in strong alkaline solution. Electrochemical data indicate that all four sulphur atoms are involved in the self-assembly process, providing an increase of SAM stability in comparison to mono or di-thiolated appended molecules. Visualisation of discrete fullerene molecules by scanning tunnelling microscopy supplied further evidence for gold modification and molecular distribution on the surface. Mixed monolayers of hexanethiol and fullerene derivatives in a proportion of 1:2 have been also studied with the purpose of controlling the amount and distribution of fullerene units on the gold surface.
Journal: Surface Science - Volume 601, Issue 21, 1 November 2007, Pages 5062-5068