Modelling the observed oscillations in the adsorption kinetics of propyltrimethoxysilane on iron and aluminum oxide surfaces

J. S. Quinton, P. C. Dastoor

Research output: Contribution to journalConference articlepeer-review

20 Citations (Scopus)

Abstract

The growth kinetics of surface films of propyltrimethoxysilane (PTMS) deposited on aluminum and iron oxide surfaces exhibit oscillatory adsorption. This phenomenon involves non-linear oscillations in surface coverage of the adsorbate, as measured by x-ray photoelectron spectroscopy (XPS), as a function of exposure time and solution concentration. In this paper, a mathematical model is presented to describe the experimentally observed time-dependent behaviour. The oscillatory nature of the adsorption can be modelled by a superposition of adsorption and desorption processes. The model quantitatively describes the rate and non-linearity of these processes. Using this model, the influence of the substrate upon the various adsorption processes is described quantitatively. A model for the physical origins of the three processes is presented.

Original languageEnglish
Pages (from-to)25-28
Number of pages4
JournalSurface and Interface Analysis
Volume30
Issue number1
DOIs
Publication statusPublished - Aug 2000
Externally publishedYes
Event8th European Conference on Applications of Surface and Interface Analisys, ECASIA 99 - Sevilla, Spain
Duration: 4 Oct 19998 Oct 1999

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