Dodecanethiol and Octadecanethiol

The main objectives of our experiments were to determine if the monolayer was still present after the evaporation process to determine if the SAM had undergone any modifications to establish if these changes are reversible to determine whether increased electrical defects in the SAM result from evaporation and to determine the nature of the perturbations induced by the copper coating. The SAMs were characterized both as deposited, and after the removal of the copper overlayer with nitric acid, using FT-RAIRS and electrochemistry. Control experiments were performed to confirm that the nitric acid solutions used for the stripping had no effect on either the organization or the coverage of the SAM. 

After the evaporation and removal of a 200 nm thick copper overlayer, the almost complete disappearance of the v (CH3, FR) 2878 cm peak was observed [30]. This 

V=stretching Lp. s in plane opi=out of pbne asym 3 asyaimelric syiD.=syinnietiic. 

825-840 835 C-H O.p. bending and ring defonnaticais Typical C-H wag of p-disubstituted benzenes 

1095-1117 1082-1099 Several modes contributing benzene breathing (mode 1 and mode 13) CHj asym. deformation v[(CHj)-(CO)S]  

---

Colavita PE, Doescher MS, Molliet A, Evans U, Reddic J, Zhou J, Chen D, Miney PG, Myrick ML (2002) Effects of metal coating on self-assembled monolayers on gold. 1. Copper on dodecanethiol and octadecanethiol. Langmuir 18(22) 8503-8509... 

---