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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.
American Chemical Society
Publication date: 
22 May 2007

Despina Fragouli, Theofanis N Kitsopoulos, Letizia Chiodo, Fabio Della Sala, Roberto Cingolani, Supratim G Ray, Ron Naaman

Biblio References: 
Volume: 23 Issue: 11 Pages: 6156-6162