[en] High-resolution electron energy loss spectroscopy (HREELS) was used to investigate the molecular
structure of self-assembled monolayers formed by adsorption of n-alkanethiols, R,ö-alkanedithiols, and
R-cycloalkyl-ö-alkanethiols on different gold substrates. The HREELS data are reported as a contribution
to a general effort to assess the potential of electron spectroscopies in the elucidation of structural
characteristics of organic surfaces. Typical fingerprints of the thiol molecules, characteristic of their primary
and secondary structure (connectivity, conformation, and order), have been found in their HREELS
vibrational spectra. We have shown that when the layers are disordered, the spectra are dominated by
impact-excited modes, hampering the identification of the compounds. These data have evidenced many
defects in the organization of the monolayers on evaporated gold substrates. The coherent domains sizes
formed by the molecules in the films have been estimated from the angular distribution of the elastic peak
as a function of the nature of the alkanethiol chain and of the immersion time in thiol solutions
Disciplines :
Chemistry
Author, co-author :
Duwez, Anne-Sophie ; Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP. Present address: University of Liège
Yu, Li-Ming; Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP
Riga, Joseph; Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP
Delhalle, Joseph; Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP
Pireaux, Jean-Jacques; Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP
Language :
English
Title :
Vibrational Structure and Organization of Various Self-Assembled Alkanethiol Monolayers: a HREELS Study
Publication date :
2000
Journal title :
Langmuir
ISSN :
0743-7463
eISSN :
1520-5827
Publisher :
American Chemical Society, Washington, United States - District of Columbia
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