Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 73: Functional Polymer Hybrids and Composites
CPP 73.3: Vortrag
Donnerstag, 15. März 2018, 15:30–15:45, PC 203
Characterization of gold nanoparticle loading and distribution within polymer brushes by neutron reflectometry — •Dikran Kesal1, Larissa Braun1, Oliver Löhmann1, Emanuel Schneck2, Marcus Trapp3, and Regine von Klitzing1 — 1Soft Matter at Interfaces, Department of Physics, TU Darmstadt, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany — 2Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
Polymer brushes are promising candidates for the design of smart surfaces. Exposed to specific stimuli, these systems undergo structural changes. Furthermore, they can be used as a matrix for the uptake of particles. Incorporating gold nanoparticles (AuNPs) in polymer brushes results in nanocomposite materials with interesting nanosensor properties due to the fact that AuNPs exhibit surface plasmon resonance (spr). Here, the interparticle distance can be used to shift the spr in a certain way. The aim is to correlate the AuNP distribution with optical properties. In the present study neutron reflectometry is used for studying the distribution of AuNPs.
The focus is on the concentration profile of AuNPs within the polymer brush, which were incubated at different pH values. The sensitivity of the method is enhanced by the use of contrast variation. The reflectivity data are analyzed with a self-written fitting procedure based on volume fraction profiles of all chemical components.