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Polymers 2019, 11(3), 410; https://doi.org/10.3390/polym11030410

The Role of Physisorption and Chemisorption in the Oscillatory Adsorption of Organosilanes on Aluminium Oxide

Flinders Institute for Nanoscale Science and Nanotechnology, Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
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Received: 30 January 2019 / Revised: 20 February 2019 / Accepted: 22 February 2019 / Published: 4 March 2019
(This article belongs to the Special Issue Nanotechnology of Polymers and Biomaterials)
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Abstract

The effect of physisorbed and chemisorbed species on the time-dependent self-assembly mechanism of organosilane films has been investigated on aluminium oxide using X-ray Photoelectron Spectroscopy. The role of physisorbed species was determined through their removal using a simple rinsing procedure while monitoring film substrate coverage. Removing physisorbed species from Propyldimethylmethoxysilane films, shown to follow a Langmuir-type adsorption profile, reduces the substrate coverage initially but quickly results in coverages equivalent to films that did not undergo a rinsing procedure. This indicates that all Propyldimethylmethoxysilane molecules are covalently bound to the substrate following 15 s of film growth. Removing physisorbed species from films, which have been shown to follow an oscillatory adsorption profile, Propyltrimethoxysilane and Propylmethyldimethoxysilane, reveal the persistence of these oscillations despite a reduction in silane substrate coverage. These results not only confirm the presence of two thermodynamically favourable phases in the condensation equilibrium reaction as physisorbed and chemisorbed species, but also indicate that the desorption of species during film growth involves both states of chemical binding. View Full-Text
Keywords: oscillatory adsorption; organosilane; self-assembly; physisorption; chemisorption oscillatory adsorption; organosilane; self-assembly; physisorption; chemisorption
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Sims, R.A.; Harmer, S.L.; Quinton, J.S. The Role of Physisorption and Chemisorption in the Oscillatory Adsorption of Organosilanes on Aluminium Oxide. Polymers 2019, 11, 410.

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