la204126x_si_001.pdf (37.29 kB)
Controlled Field Evaporation of Fluorinated Self-Assembled Monolayers
journal contribution
posted on 2012-01-10, 00:00 authored by Andreas Stoffers, Christian Oberdorfer, Guido SchmitzSelf-assembled monolayers of amino-undecanethiol and
perfluoro-decanethiol
are studied by atom probe tomography based on laser-assisted controlled
field desorption. In the case of hydrogenated chains the identification
of detected molecular species is difficult because of residual hydrocarbons.
By contrast, fractions of the fluorinated chains can be unequivocally
identified. Although chemically similar, the evaporation of both chains
appears in significantly different molecular fractions. For the fluorinated
chains, a well-ordered evaporation sequence is determined that allows
conclusions to be drawn about the strength of bonds under field conditions
and may lay the basis for the future numerical reconstruction of the
chemical structure of such films.