Metal work-function changes induced by organic adsorbates: a combined experimental and theoretical study.
The role of molecular dipole moment, charge transfer, and Pauli repulsion in determining the work-function change (Deltaphi) at organic-metal interfaces has been elucidated by a combined experimental and theoretical study of (CH(3)S)(2)/Au(111) and CH(3)S/Au(111). Comparison between experiment and theory allows us to determine the origin of the interface dipole layer for both phases. For CH(3)S/Au(111), Deltaphi can be ascribed almost entirely to the dipole moment of the CH(3)S layer. For (CH(3)S)(2)/Au(111), a Pauli repulsion mechanism occurs. The implications of these results on the interpretation of Deltaphi in the presence of strongly and weakly adsorbed molecules is discussed.
De Renzi
V
V
INFM Center for nanoStructures and bioSystem at Surfaces and Dipartimento di Fisica, Università di Modena e Reggio Emilia, Modena, Italy. vderenzi@unimore.it
Rousseau
R
R
Marchetto
D
D
Biagi
R
R
Scandolo
S
S
Del Pennino
U
U