Issue 32, 2021
From the journal:

Soft Matter

Polymer ligand binding to surface-immobilized gold nanoparticles: a fluorescence-based study on the adsorption kinetics†

Julian Sindram*a  and  Matthias Karg ORCID logo a  

* Corresponding authors

a Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany
E-mail: sindram@hhu.de

Abstract

We report on a simple, fluorescence-based method for the investigation of the binding kinetics of polystyrene ligands, dispersed in an organic solvent, to substrate supported gold nanoparticles. For this purpose, we develop a protocol for the immobilization of gold nanoparticles on glass substrates, that yields sub-monolayers of randomly distributed particles with excellent homogeneity and reproducibility. Using fluorescently labeled polystyrene, we monitor the ligand concentration in bulk dispersion in real time and follow the binding to the particle-decorated substrates. The influence of the ligand molecular weight on the binding kinetics is investigated. We correlate the reaction rates with the diffusion coefficients of the different ligands and are able to describe the molecular weight dependency with a simple kinetic model. Both the diffusion and the activation step appear to contribute to the effective reaction rates.

Graphical abstract: Polymer ligand binding to surface-immobilized gold nanoparticles: a fluorescence-based study on the adsorption kinetics

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Article information

DOI
https://doi.org/10.1039/D1SM00892G
Article type
Paper
Submitted
15 Jun 2021
Accepted
22 Jul 2021
First published
22 Jul 2021
This article is Open Access
Creative Commons BY-NC license

Soft Matter, 2021,17, 7487-7497

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Polymer ligand binding to surface-immobilized gold nanoparticles: a fluorescence-based study on the adsorption kinetics

J. Sindram and M. Karg, Soft Matter, 2021, 17, 7487 DOI: 10.1039/D1SM00892G

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