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Issue 1, 2012

Adsorption behaviour of sulfur containing polymers to gold surfaces using QCM-D

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Abstract

We investigate the influences that functional group, polymer molecular weight and polymer molecular architecture have on the adsorption behaviour of some sulfur containing oligo(ethylene glycol) polymers to gold. QCM-D and XPS was used in this investigation revealing that disulfide functional groups bind with more mass deposited than dithio, trithio or thiols. This was observed with small di(ethylene glycol) polymers and with higher mass polymers. The effect of the sulfo-groups was not as apparent with higher mass polymers. Longer PEG pendent chains resulted in lower binding overall on the gold surface in comparison to shorter DEG chains caused by shielding of sulfur by the longer pendent chains. Thiols undergo two steps during the adsorption process while all other sulfur species adsorb in one step. XPS revealed the dissociation of disulfide bonds when binding to gold. These findings are important when forming stable polymer films on gold efficiently, with uses in applications from bio-fouling to polymer-lipid bilayers.

Graphical abstract: Adsorption behaviour of sulfur containing polymers to gold surfaces using QCM-D

Supplementary files

Article information


Submitted
23 Jul 2011
Accepted
19 Sep 2011
First published
13 Oct 2011

Soft Matter, 2012,8, 118-128
Article type
Paper

Adsorption behaviour of sulfur containing polymers to gold surfaces using QCM-D

S. Slavin, A. H. Soeriyadi, L. Voorhaar, M. R. Whittaker, C. R. Becer, C. Boyer, T. P. Davis and D. M. Haddleton, Soft Matter, 2012, 8, 118 DOI: 10.1039/C1SM06410J

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