Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/24669

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Title
Measuring the tilt angle of ODTMS self-assembled monolayers on Al oxide surfaces
Author/Creator
Thomsen, Lars;  Watts, Benjamin;  Cotton, Daniel Vincent;  Dastoor, Paul Christopher
Description
Adsorbed octadecyltrimethoxysilane (ODTMS) on native aluminium oxide substrates have been studied with near-edge X-ray absorption fine structure (NEXAFS) spectroscopy in order to determine the average tilt angle of the surface film. Previous experiments have shown that the time-dependant adsorption isotherm of ODTMS on Al exhibits oscillatory adsorption. In this work we present the findings of our tilt angle studies for Al samples dipped in a 0.75% ODTMS solution at various times during oscillatory adsorption. It clearly can be seen that the alignment of the surface film is related to the coverage, hence for a minimum in the film coverage (at 65 s dip time) the tilt angle of the ODTMS film is found to be ~50° relative to the surface normal. Below the minimum in the film coverage (at 30 s dip time) the tilt angle has been found to be ~41° whereas for samples dipped above the minimum film coverage (at 80 and 95 s) the angles are ~46° and ~45° respectively. These measurements indicate a strong correlation between film alignment and film coverage during oscillatory adsorption.
Relation
Synthetic Metals Vol. 154, no. 1-3, p. 9-12
Date
2005
Publisher
Elsevier
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/24669
Identifier
ISSN:0379-6779
Language
eng
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Subject
"Synthetic Metals"
 
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