1 research outputs found
Exploring Azobenzenethiol Adsorption on the Ag/Ge(111) Surface with Surface Raman Spectroscopy
Self-assembled
monolayers (SAMs) formed with thiols on surfaces
represent the most representative system of such kind. Their detailed
adsorption orientation and kinetics are however rarely elucidated
completely, making the development of the SAM systems mostly based
on try-and-error approach. We have studied the adsorption of azobenzenethiol
(azoSH) on the Ag/Ge(111)-(√3 × √3)<i>R</i>30° surface, as an archetype of SAMs on compound surfaces, with <i>in situ</i> surface Raman spectroscopy. Two different adsorbates
have been identified with their vibrational signatures and orientations.
They respectively correspond to the two adsorption sites of this compound
surface system, owing to distinct molecule–surface interactions,
and both exhibit Langmuir adsorption behavior. These traits are compared
with that on the Ge(111) surface, bearing homogeneous adsorption propensity,
where one precursor of adsorption has been identified. The revelation
of the detailed adsorption traits of azoSH has demonstrated that surface
Raman spectroscopy is expedient in revealing complex adsorption behaviors
of the SAM systems