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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Poster Session II
CPP 32.33: Poster
Donnerstag, 20. März 2025, 09:30–12:00, P3
Bimetallic Core-Shell-Nanoparticles for enhanced Raman spectroscopy — •Moritz Willems1, Steffi Stumpf1,2, and Stephanie Hoeppener1,2 — 1Jena Center for Soft Matter (JCSM) — 2Institute of Organic and Macromolecular Chemistry (IOMC)
Bimetallic Core-Shell-Nanoparticles have emerged as a versatile tool for advanced sensing applications, particularly in surface-enhanced Raman spectroscopy and tip-enhanced Raman spectroscopy. The combination of two metals in a Core-Shell configuration enhances the plasmonic properties and allows for extended plasmonic bandwidths, as well as superior electromagnetic field amplification in comparison to the monometallic nanoparticles. Silver nanoparticles have been demonstrated to offer effective enhancements for Raman spectroscopy. However, they do present certain challenges, including a narrow spectral range, poor chemical stability, and a relatively short lifespan. The coating of silver nanoparticles with a thin gold shell promises precise control over localised surface plasmon resonance, expanding spectral ranges for Raman spectroscopy measurements, especially between the peaks of gold and silver, by changing the relative thickness of the shell. Furthermore, the gold coating allows for measurements in water, while also providing a prolonged lifespan. The synthesis of these nanoparticles utilizes chemical reduction by microwave irradiation, providing fast, energy efficient and uniform heating. Various methods have been tested to overcome the problems of synthesising a gold shell on silver, and detailed transmission electron microscopy and UV-Vis spectroscopy analysis complement the Raman spectroscopy results.
Keywords: Raman Spectroscopy; Metall Nanoparticles; Core-Shell Nanoparticles; Transmission Electron Microscopy; Microwave Synthesis