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Issue 37, 2013

Interaction of gold nanoparticles with thermoresponsive microgels: influence of the cross-linker density on optical properties

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Abstract

The interaction of spherical gold nanoparticles (Au-NPs) with microgels composed of chemically cross-linked poly-(N-isopropylacrylamide) is reported. Simple mixing of the two components leads to adsorption of the gold particles onto the microgels. Different loading densities can be achieved by varying the ratio of gold particles to microgel particles. The adsorption of gold nanoparticles is analysed by TEM, UV-Vis absorption spectroscopy and SAXS. The influence of the microgel mesh size on the adsorption of gold nanoparticles is investigated by using microgels with three different cross-linker densities. The results suggest a strong relationship between the nanoparticle penetration depth and the cross-linker density. This, in turn, directly influences the optical properties of the colloids due to plasmon resonance coupling. In addition, information about the mesh size distribution of the microgels is obtained. For the first time the change in optical properties by varying cross-linker density and temperature is directly related to the formation of dimers of gold particles, proven by SAXS.

Graphical abstract: Interaction of gold nanoparticles with thermoresponsive microgels: influence of the cross-linker density on optical properties

Supplementary files

Article information


Submitted
12 Apr 2013
Accepted
22 Jul 2013
First published
23 Jul 2013

Phys. Chem. Chem. Phys., 2013,15, 15623-15631
Article type
Paper

Interaction of gold nanoparticles with thermoresponsive microgels: influence of the cross-linker density on optical properties

K. Gawlitza, S. T. Turner, F. Polzer, S. Wellert, M. Karg, P. Mulvaney and R. V. Klitzing, Phys. Chem. Chem. Phys., 2013, 15, 15623 DOI: 10.1039/C3CP51578H

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