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Magnetic Fe3O4@SiO2@[email protected] NPs/Au Film with Hybrid Localized Surface Plasmon/Surface Plasmon Polariton Modes for Surface-Enhanced Raman Scattering Detection of Thiabendazole

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A magnetic Fe3O4@SiO2@[email protected] nanoparticle (NPs)/Au film was fabricated as an effective surface-enhanced Raman scattering (SERS) substrate through a combination of a solvothermal reaction, the Stöber method and an in-situ reaction. The superparamagnetic property of Fe3O4@SiO2@Ag and the decoration with –COOH groups allow efficient enrichment and capture of thiabendazole molecules. A large quantity of sub-10 nm gaps emerge when Ag NPs are decorated on the surface of the SiO2 shell, offering a dramatic electromagnetic field enhancement induced by localized surface plasmon resonance (LSPR). Finite-difference time-domain (FDTD) simulations show that strong near-field enhancement around the gap areas between the Ag NPs and Au film occurs, which is caused by the coupling between the LSPR of the Ag NPs and surface plasmon polaritons (SPPs) of the Au film. Due to the superparamagnetic property and high electromagnetic field enhancement, the Fe3O4@SiO2@[email protected] NPs/Au film as a SERS substrate can detect 1 μg/L thiabendazole in solution, showing great potential for SERS detection of environmental pollutants.
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Keywords: Ag Nanoparticles; Hybrid LSP/SPP Modes; Surface-Enhanced Raman Scattering; Thiabendazole

Document Type: Research Article

Affiliations: Agricultural Product Quality Safety Inspection and Testing Center of Shenzhen, Shenzhen 518000, China

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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