FORMATION, CHARACTERIZATION AND STABILITY OF METHYL SELENOLATE MONOLAYERS ON Au(111). AN ELECTROCHEMICAL, HIGH RESOLUTION PHOTOEMISSION SPECTROSCOPY AND DFT STUDY

COMETTO, F; C. A. CALDERON; MORAN, M; RUANO; P. PAREDES OLIVERA; E. M. PATRITO

AMER CHEMICAL SOC

Lugar: Washington; Año: 2014 vol. 30 p. 3754 - 3754

e investigated the mechanism of formation and stability 11 of self-assembled monolayers (SAMs) of methaneselenolate on Au(111) 12 prepared by the immersion method in ethanolic solutions of dimethyl 13 diselenide (DMDSe). The adsorbed species were characterized by 14 electrochemical measurements and high-resolution photoelectron spec- 15 troscopy (HR-XPS). The importance of the headgroup on formation 16 mechanism and the stability of the SAMs was addressed by comparatively 17 studying methaneselenolate (MSe) and methanethiolate (MT) mono- 18 layers. Density Functional Theory (DFT) calculations were performed to 19 identify the elementary reaction steps in the mechanisms of formation and 20 decomposition of the monolayers. Reductive desorption and HR-XPS 21 measurements indicated that a MSe monolayer is formed at short 22 immersion times by the cleavage of the Se−Se bond of DMDSe. However, 23 the monolayer decomposes at long immersion times at room temperature, 24 as evidenced by