Facile synthesis of gold core-polymer shell responsive particles

D'Souza-Mathew, Mark, Cayre, Olivier J., Hunter, Timothy N and Biggs, Simon R. (2013) Facile synthesis of gold core-polymer shell responsive particles. Journal of Colloid and Interface Science, 407 187-195. doi:10.1016/j.jcis.2013.06.046

Author D'Souza-Mathew, Mark
Cayre, Olivier J.
Hunter, Timothy N
Biggs, Simon R.
Title Facile synthesis of gold core-polymer shell responsive particles
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 2013-10
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.jcis.2013.06.046
Open Access Status
Volume 407
Start page 187
End page 195
Total pages 9
Place of publication Maryland Heights, United States
Publisher Academic Press
Language eng
Abstract The free adsorption of an end-functionalised weak polybase, poly dimethylaminoethyl methacrylate (pDMAEMA), on the surface of colloidal gold nanoparticles (AuNPs) as a route to produce a responsive core-shell nanoparticle is explored here. Optimal conditions for the physisorption of the polymeric chains onto the colloidal nanoparticles are explored. A dense coverage is facilitated by rapidly mixing the well solvated pH responsive homopolymer, at low pH, into a relatively poor solvent environment, at higher pH, containing a stable dispersion of charge-stabilised gold nanoparticles. The rapid pH change causes the polymer chains to concurrently collapse and adsorb onto the gold nanoparticles. In order to achieve sterically stable, monodisperse and responsive core shell nanoparticles, a crucial factor is the pH difference of the systems prior to their mixing. Once adsorbed, end-functional thiol groups on the adsorbed polymer chains can form more permanent covalent attachments with the core particles. Dynamic light scattering coupled with mobility data of pH titration experiments show that the core-shell particles exhibit a responsive character consistent with the observed potentiometric titration data of the polymer. The same particles demonstrate reversible aggregation when cycled between pH extremes. This is confirmed by shifts in the SPR peak of the corresponding UV-Vis absorption profile. The ease and flexibility of this strategy for core-shell particle production, coupled with the stability and responsiveness of the product, make this a promising colloidal coating mechanism.
Keyword AuNPs
Core-shell particles
Gold nanoparticles
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology Publications
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