NDLI: Thermally Stable Magneto-Plasmonic Nanoparticles for SERS with Tunable Plasmon Resonance

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Thermally Stable Magneto-Plasmonic Nanoparticles for SERS with Tunable Plasmon Resonance

Content Provider	MDPI
Author	Mikoliunaite, Lina Talaikis, Martynas Michalowska, Aleksandra Dobilas, Jorunas Stankevic, Voitech Kudelski, Andrzej Niaura, Gediminas
Copyright Year	2022
Description	Bifunctional magneto-plasmonic nanoparticles that exhibit synergistically magnetic and plasmonic properties are advanced substrates for surface-enhanced Raman spectroscopy (SERS) because of their excellent controllability and improved detection potentiality. In this study, composite magneto-plasmonic nanoparticles $(Fe_{3}O_{4}$@AgNPs) were formed by mixing colloid solutions of 50 nm-sized magnetite nanoparticles with 13 nm-sized silver nanoparticles. After drying of the layer of composite $Fe_{3}O_{4}$@AgNPs under a strong magnetic field, they outperformed the conventional silver nanoparticles during SERS measurements in terms of signal intensity, spot-to-spot, and sample-to-sample reproducibility. The SERS enhancement factor of $Fe_{3}O_{4}$@AgNP-adsorbed 4-mercaptobenzoic acid (4-MBA) was estimated to be 3.1 × $10^{7}$ for a 633 nm excitation. In addition, we show that simply by changing the initial volumes of the colloid solutions, it is possible to control the average density of the silver nanoparticles, which are attached to a single magnetite nanoparticle. UV-Vis and SERS data revealed a possibility to tune the plasmonic resonance frequency of $Fe_{3}O_{4}$@AgNPs. In this research, the plasmon resonance maximum varied from 470 to 800 nm, suggesting the possibility to choose the most suitable nanoparticle composition for the particular SERS experiment design. We emphasize the increased thermal stability of composite nanoparticles under 532 and 442 nm laser light irradiation compared to that of bare $Fe_{3}O_{4}$ nanoparticles. The $Fe_{3}O_{4}$@AgNPs were further characterized by XRD, TEM, and magnetization measurements.
Starting Page	2860
e-ISSN	20794991
DOI	10.3390/nano12162860
Journal	Nanomaterials
Issue Number	16
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2022-08-19
Access Restriction	Open
Subject Keyword	Nanomaterials Spectroscopy Sers Magneto-plasmonic Nanostructures Magnetite Silver Nanoparticles
Content Type	Text
Resource Type	Article

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