Plasmon-coupled Charge Transfer in FSZA Core-shell Microspheres with High SERS Activity and Pesticide Detection

Abstract

A commercial SERS substrate does not only require strong enhancement, but also can be reused and recycled in actual application. Herein, Fe3O4/SiO2/ZnO/Ag (FSZA) have been synthesised, which consisted of Fe3O4 core with strong magnetic field response and an intermediate SiO2 layer as an electronic barrier to keep the stability of magnetite particles and outer ZnO and Ag as the effective layers for detecting pollutants. The SERS enhancement factor (EF) of the FSZA was ~8.2 × 105. The enhancement mechanism of the FSZA core-shell microspheres were anatomized. The electromagnetic enhancement of surface deposited Ag, charge transfer, and molecular and exciton resonances act together to cause such high enhancement factors. For practical application, the FSZA core-shell microspheres were also used to detect thiram, moreover, which was collected and separated by an external magnetic field, and maintained the SERS activity without significant decline during multiple tests. So the good enhancement performance and magnetic recyclability make the FSZA core-shell microspheres a promising candidates for practical SERS detection applications.

Synergic effect of Type II ZnO/BiVO4 magnetic heterostructures for visible light‐driven degradation of bisphenol A and methyl violet

“…The literature precedence and the experimental findings suggest that FSZ does not work efficiently under visible light irradiation for photocatalytic application because Fe 3 O 4 core with strong magnetic field response is coated with intermediate SiO 2 layer, which acts as an electronic barrier to keep the stability of magnetite particles and outer ZnO for detecting pollutants. [ 24 ] Henceforth, the active components of our designed photocatalyst are ZnO and BiVO 4 . The degradation process was enhanced significantly upon utilising FSZB‐2 under irradiation with visible light LED bulbs.…”

Plasmonic Resonant Cavity Provides a Flexible Substrate for Surface-Enhanced Raman Spectroscopy Detection in a Wide Band Range

“…The detection sensitivity of SERS is primarily influenced by the materials and nanostructures of the substrate as well as the excitation wavelength. This technology has the potential to serve as an optical inspection tool in various applications, including the field of biomedical research, − environmental science, food safety, − trace analysis, and chemistry. − The study and development of SERS substrates can also be interpreted as the manipulation of the interaction between light and matter . A comprehensive understanding of these interactions serves as the foundation for conducting SERS research and developing novel SERS substrates.…”

Toward low-cost and sustainable SERS substrate: novel ultrasensitive AMS5 nanoflowers

“…Surface-enhanced Raman scattering (SERS) has received increasing attention in recent years due to its ultrahigh sensitivity and unique spectral fingerprint, showing wide applications in the fields of analytical chemistry and environmental science. [1][2][3][4] In the past ten years, many methods have been tried to improve the activity of SERS substate materials. [5][6][7][8][9][10][11] Despite the fact that these SERS signal have been greatly enhanced, their high cost, poor uniformity, and storage problems limit their commercial application.…”