Magnetic Assembly Route to Construct Reproducible and Recyclable SERS Substrate

Area of Science:

• Materials Science
• Nanotechnology
• Analytical Chemistry

Background:

• Fabricating uniform array films from colloidal building blocks is crucial for integrated functions.
• Surface-enhanced Raman scattering (SERS) requires sensitive and reproducible detection methods.

Purpose of the Study:

• To develop a magnetic assembly route for organizing noble metal microspheres into uniform array films.
• To achieve high SERS detection sensitivity and reproducibility using these assembled films.
• To enable self-cleaning and recycling of the SERS substrate.

Main Methods:

• Synthesis of monodisperse multifunctional Fe3O4@SiO2@TiO2@Ag (FOSTA) colloidal microspheres using an ultrasonic-assisted reaction system.
• Magnetic assembly of FOSTA microspheres into uniform array films under an external magnetic field.
• Application of the FOSTA array films for SERS detection of R6G analyte.

Main Results:

• Successful synthesis of uniform FOSTA colloidal microspheres.
• Demonstration of magnetic assembly into uniform array films.
• High SERS detection sensitivity and good reproducibility achieved.
• Recyclable SERS application enabled by the photocatalytic self-cleaning function of the TiO2 interlayer.

Conclusions:

• The magnetic assembly route provides an effective method for fabricating uniform SERS-active array films.
• FOSTA microspheres offer integrated signal sensitivity, reproducibility, and recyclability for SERS applications.
• This approach holds promise for advanced sensing and analytical applications.