NDLI: Preparation of $Fe_{3}O_{4}$-Ag Nanocomposites with Silver Petals for SERS Application

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Preparation of $Fe_{3}O_{4}$-Ag Nanocomposites with Silver Petals for SERS Application

Content Provider	MDPI
Author	Nguyen, Thi Mammeri, Fayna Ammar, Souad Nguyen, Trong Nghiem, Thi Thuy, Nguyen Ho, Thi
Copyright Year	2021
Description	The formation of silver nanopetal-Fe3O4 poly-nanocrystals assemblies and the use of the resulting hetero-nanostructures as active substrates for Surface Enhanced Raman Spectroscopy (SERS) application are here reported. In practice, about 180 nm sized polyol-made Fe3O4 spheres, constituted by 10 nm sized crystals, were functionalized by (3-aminopropyl)triethoxysilane (APTES) to become positively charged, which can then electrostatically interact with negatively charged silver seeds. Silver petals were formed by seed-mediated growth in presence of Ag+ cations and self-assembly, using L-ascorbic acid (L-AA) and polyvinyl pyrrolidone (PVP) as mid-reducing and stabilizing agents, respectively. The resulting plasmonic structure provides a rough surface with plenty of hot spots able to locally enhance significantly any applied electrical field. Additionally, they exhibited a high enough saturation magnetization with Ms = 9.7 emu g−1 to be reversibly collected by an external magnetic field, which shortened the detection time. The plasmonic property makes the engineered Fe3O4-Ag architectures particularly valuable for magnetically assisted ultra-sensitive SERS sensing. This was unambiguously established through the successful detection, in water, of traces, (down to 10−10 M) of Rhodamine 6G (R6G), at room temperature.
Starting Page	1288
e-ISSN	20794991
DOI	10.3390/nano11051288
Journal	Nanomaterials
Issue Number	5
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-05-13
Access Restriction	Open
Subject Keyword	Nanomaterials Spectroscopy Fe3o4 Poly-nanocrystals Silver Nanopetals Fe3o4-ag Architecture Magnetically Assisted Sers Sensing Rhodamine 6g
Content Type	Text
Resource Type	Article

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