Title:
Mixed self-assembled monolayers of azobenzene photoswitches with
trifluoromethyl and cyano end groups
Author(s):
Brete, Daniel; Pryzembel, Daniel; Eickhoff, Christian; Carley, Robert Edward; Freyer, Wolfgang; Reuter, Karsten; Gahl, Cornelius; Weinelt, Martin
Year of publication:
2012
Available Date:
2014-04-29
Abstract:
Mixed self-assembled monolayers (SAMs) of alkanethiolates carrying azobenzene
chromophores with either a trifluoromethyl or a cyano substituent have been
studied. High-resolution x-ray photoelectron spectroscopy proves that the
ratio of adsorbed molecules can be arbitrarily adjusted via the molar
fractions in solution. As a function of these molar fractions core level
shifts are observed which are attributed to local work-function changes. By
simulating the electric dipole field distribution, the continuous core level
shifts are ascribed to a homogeneous mixture of molecules with different end
groups adsorbed on adjacent lattice sites. Near-edge x-ray absorption fine
structure measurements reveal formation of well-ordered SAMs. Despite the
difference in dipole moment of the end groups, the molecular tilt and twist
angles are identical for both single-component SAMs and a 1:1 mixed SAM.
Part of Identifier:
ISSN (print): 0953-8984
DDC-Classification:
530 Physik
Publication Type:
Wissenschaftlicher Artikel
Also published in:
Journal of Physics: Condensed Matter. - 24 (2012), 39, Artikel Nr. 394015/1-10
URL of the Original Publication:
DOI of the Original Publication:
Department/institution:
Physik
Institut für Experimentalphysik
Comments:
This is an author-created, un-copyedited version of an article published in
Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible
for any errors or omissions in this version of the manuscript or any version
derived from it. The Version of Record is available online at
10.1088/0953-8984/24/39/394015