Imaging photoelectron transmission through self-assembled monolayers: the work-function of alkanethiols coated gold.
In this paper, we present a new approach for studying the electronic properties of self-assembled monolayers and their interaction with a conductive substrate, the low-energy photoelectron imaging spectroscopy (LEPIS). LEPIS relies on imaging of photoelectrons ejected from a conductive substrate and subsequently transmitted through organic monolayers. Using this method, we measure the relative work-function of alkanethiols of different length on gold substrate, and we are able to follow the changes occurring when the surface coverage is varied. We also computed the work-function of model alkanethiols using a plane-wave density functional theory approach, in order to demonstrate the correlation between changes in the work-function with the monolayer organization and density.
Fragouli
Despina
D
Institute of Electronic Structure and Laser (FORTH) and Department of Chemistry, University of Crete, 71110 Heraklion-Crete, Greece.
Kitsopoulos
Theofanis N
TN
Chiodo
Letizia
L
Della Sala
Fabio
F
Cingolani
Roberto
R
Ray
Supratim G
SG
Naaman
Ron
R