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Uptake of pH-Sensitive Gold Nanoparticles in Strong Polyelectrolyte Brushes

Kesal, Dikran ; Christau, Stephanie ; Krause, Patrick ; Möller, Tim ; Klitzing, Regine von (2021):
Uptake of pH-Sensitive Gold Nanoparticles in Strong Polyelectrolyte Brushes. (Publisher's Version)
In: Polymers, 8 (4), MDPI, e-ISSN 2073-4360,
DOI: 10.26083/tuprints-00019057,

Available under: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Uptake of pH-Sensitive Gold Nanoparticles in Strong Polyelectrolyte Brushes
Language: English

The impact of electrostatic attraction on the uptake of gold nanoparticles (AuNPs) into positively charged strong poly-[2-(Methacryloyloxy) ethyl] trimethylammonium chloride (PMETAC) polyelectrolyte brushes was investigated. In this work, PMETAC brushes were synthesized via surface-initiated atom transfer radical polymerization (Si-ATRP). PMETAC/AuNP composite materials were prepared by incubation of the polymer brush coated samples into 3-mercaptopropionic acid-capped AuNP (5 nm in diameter) suspension. The electrostatic interactions were tuned by changing the surface charge of the AuNPs through variations in pH value, while the charge of the PMETAC brush was not affected. Atomic-force microscopy (AFM), ellipsometry, UV/Vis spectroscopy, gravimetric analysis and transmission electron microscopy (TEM) were employed to study the loading and penetration into the polymer brush. The results show that the number density of attached AuNPs depends on the pH value and increases with increasing pH value. There is also strong evidence that the particle assembly is dependent on the pH value of the AuNP suspension. Incubation of PMETAC brushes in AuNP suspension at pH 4 led to the formation of a surface layer on top of the brush (2D assembly) due to sterical hindrance of the clustered AuNPs, while incubation in AuNP suspension at pH 8 led to deeper particle penetration into the brush (3D assembly). The straightforward control of particle uptake and assembly by tuning the charge density of the nanoparticle surface is a valuable tool for the development of materials for colorimetric sensor applications.

Journal or Publication Title: Polymers
Volume of the journal: 8
Issue Number: 4
Publisher: MDPI
Collation: 16 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 11 Aug 2021 13:03
Last Modified: 11 Aug 2021 13:04
DOI: 10.26083/tuprints-00019057
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-190578
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19057
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