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Information × Registration Number 0224U033402, (0124U003014) , R & D reports Title Exploring Magnetoplasmonic Interactions in Fe3O4/Au(Ag) Nanoparticles for Multifunctional SERS Applications popup.stage_title Спектроскопічна характеризація, чисельне моделювання НЧ Fe3O4, Fe3O4/Au(Ag). Head Dzhagan Volodymyr M., Доктор фізико-математичних наук Registration Date 26-12-2024 Organization V. Lashkaryov Institute of Semiconductor Physics of National Academy popup.description1 Develop novel hybrid nanoparticles composed of Fe3O4 and Au, Ag, or Au@Ag core-shells and to determine their potential as new functional materials with enhanced magnetic, electronic, and optical properties. popup.description2 Colloidal Fe3O4/Au(Ag) nanoparticles (NPs) have been investigated for hyperthermic treatment of tumors, targeted delivery of drugs, Surface-Enhanced Raman spectroscopy (SERS). Most of the research has been devoted to testing different NP morphologies and analytes. Much less addressed was deeper understanding of physical and chemical properties of these systems, in particular how their magnetic and plasmonic parts influence each other. Magneto-plasmonic nanocomposites can possess properties inherent to both individual components (iron oxide and gold nanoparticles). Here, we report on Fe3O4/Au hybrid nanoparticles (NPs) synthesized with the use of trisodium citrate via chemical reduction of Au ions in the presence of nanosized magnetite. The optical absorption spectra of Fe3O4/Au NPs do not exhibit a characteristic absorption band related with localized surface plasmon resonance (LSPR), which is observed for Au NPs synthesized separately. Raman spectroscopy study proves the obtained material is magnetite (Fe3O4) without notable admixture of another stable iron oxide form, hematite (Fe2O3). The NCs also revealed very good resistance to oxidation during the long-term storage (for 4 months) in both solution and prepared from it (dry) NP film. Such a good stability of the Fe3O4 NPs obtained by a facile and scalable approach is important for their practical applications. The EPR spectra of the Fe3O4 NPs can be fit with a single component, while the lineshape of the Fe3O4/Au NPs is significantly different and requires up to 5 components. Based on the developed theoretical model, we relate these components with the contribution of small NPs of different size. But since the dispersion of Fe3O4 NPs did not change significantly after the application of metal NPs, we associate different components of the EPR spectra with the effect of metal NPs, probably due to their different morphology and other properties on Fe3O4 NPs of different sizes. Product Description popup.authors Kapush Olha A. Konchyts Andrii A. Shanina Bela D. popup.nrat_date 2024-12-26 Close