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Ordered Arrangement and Optical Properties of Silica-Stabilized Gold Nanoparticle–PNIPAM Core–Satellite Clusters for Sensitive Raman Detection

Ordered Arrangement and Optical Properties of Silica-Stabilized Gold Nanoparticle–PNIPAM Core–Satellite Clusters for Sensitive Raman Detection
Janning F. Herrmann, Stephanie Hoeppener, Florian Kretschmer, Christiane Höppener, Ulrich S. Schubert
Gold–polymer hybrid nanoparticles attract wide interest as building blocks for the engineering of photonic materials and plasmonic (active) metamaterials with unique optical properties. In particular, the coupling of the localized surface plasmon resonances of individual metal nanostructures in the presence of nanometric gaps can generate highly enhanced and confined electromagnetic fields, which are frequently exploited for metal-enhanced light–matter interactions. The optical properties of plasmonic structures can be tuned over a wide range of properties by means of their geometry and the size of the inserted nanoparticles as well as by the degree of order upon assembly into 1D, 2D, or 3D structures. Here, the synthesis of silica-stabilized gold–poly(N-isopropylacrylamide) (SiO2-Au-PNIPAM) core–satellite superclusters with a narrow size distribution and their incorporation into ordered self-organized 3D assemblies are reported. Significant alterations of the plasmon resonance are found for different assembled structures as well as strongly enhanced Raman signatures are observed. In a series of experiments, the origin of the highly enhanced signals can be assigned to the interlock areas of adjacent SiO2-Au-PNIPAM core–satellite clusters and their application for highly sensitive nanoparticle-enhanced Raman spectroscopy is demonstrated. Silica-stabilized gold–poly(N-isopropylacrylamide) polymer–metal hybrid nanoparticles with a core–satellite structure are tested for nanoparticle-enhanced Raman spectroscopy. It is demonstrated that the interlock areas between the nanoparticles are responsible for their high enhancement capabilities and greatly improve the Raman performance of the nanoparticles when arranged into small clusters or 3D organized structures.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201701095

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