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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster Session I

CPP 15.27: Poster

Montag, 17. März 2025, 19:00–21:00, P4

Effect of grafting density on particle distribution in polymer brush/gold nanoparticle composite materials — •Elias Hallenbach, Hayden Robertson, and Regine von Klitzing — Institute for Condensed Matter Physics, Technical University of Darmstadt, Germany

Metal/polymer nanocomposites are versatile hybrid materials and find use in many fields such as photonics, biomedical engineering and catalysis. A promising realization of this type of hybrid material is the controlled self-assembly of gold nanoparticles (AuNPs) inside a polymer brush, which induces color changes upon exposure to environmental changes enabling sensor applications.

The polymer brushes serve as a matrix for the immobilization of AuNPs. Particle uptake into the brush matrix is affected by parameters such as thickness, particle size and the grafting density. Polymer brushes with varying grafting densities are synthesized by a controlled polymerization (SI-ARGET ATRP) directly from a silicon substrate. The nanocomposite materials are fabricated by dip-coating of polymer brushes into a AuNP dispersion. Characterization of the nanocomposites is performed by (in situ) spectroscopic ellipsometry, atomic force microscopy and (in situ) X-ray reflectometry (XRR).

Uptake of nanoparticles has proven to be highest at intermediate grafting densities. I will discuss the influence of particle distribution inside the brush on particle uptake, which can be yielded by XRR measurements.

Keywords: nanocomposite; polymer brush; gold nanoparticles