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- Title
Preparation of Fe 3 O 4 -Ag Nanocomposites with Silver Petals for SERS Application.
- Authors
Nguyen, Thi Thuy; Mammeri, Fayna; Ammar, Souad; Nguyen, Thi Bich Ngoc; Nguyen, Trong Nghia; Nghiem, Thi Ha Lien; Thuy, Nguyen Thi; Ho, Thi Anh; Losurdo, Maria
- Abstract
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.
- Subjects
IRON oxides; SERS spectroscopy; SILVER; STABILIZING agents; NANOCOMPOSITE materials
- Publication
Nanomaterials (2079-4991), 2021, Vol 11, Issue 5, p1288
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano11051288