Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 20, Issue 4, Pages 2079-2086Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2020.17323
Keywords
Surface-Enhanced Raman Scattering; Hybrid LSP/SPP Modes; Ag Nanoparticles; Thiabendazole
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Funding
- Shenzhen Science and Technology Research Funding [JCYJ20160608141439330]
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A magnetic Fe3O4@SiO2@Ag@COOH nanoparticle (NPs)/Au film was fabricated as an effective surface-enhanced Raman scattering (SERS) substrate through a combination of a solvothermal reaction, the Stober 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@Ag@COOH NPs/Au film as a SERS substrate can detect 1 mu g/L thiabendazole in solution, showing great potential for SERS detection of environmental pollutants.
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