Organization-induced charge redistribution in self-assembled organic monolayers on gold.
The charge redistribution that occurs within dipolar molecules as they self-assemble into organized organic monolayer films has been studied. The extent of charge transfer is probed by work function measurements, using low-energy photoelectron spectroscopy (LEPS), contact potential difference (CPD), and X-ray photoelectron spectroscopy (XPS), with the latter providing fine details about the internal charge distribution along the molecule. In addition, two-photon photoelectron spectroscopy is applied to investigate the electronic structure of the adsorbed layers. We show that charge transfer acts to reduce the dipole-dipole interaction between the molecules but may either decrease or increase the molecule-to-surface dipole moment.
Ray
S G
SG
Department of Chemical Physics and Chemical Research Support, Weizmann Institute, Rehovot 76100, Israel.
Cohen
H
H
Naaman
R
R
Liu
Haiying
H
Waldeck
D H
DH