Ag@Fe₃O₄ Core-Shell Surface-Enhanced Raman Scattering Probe for Trace Arsenate Detection

Area of Science:

• Nanotechnology
• Analytical Chemistry
• Environmental Science

Background:

• Effective detection of trace arsenic (As) is crucial for ensuring drinking water safety.
• Existing methods for arsenic detection face challenges in sensitivity and reliability.

Purpose of the Study:

• To design and prepare Ag@Fe3O4 core-shell nanoparticles (NPs) for sensitive detection of trace arsenate (As(V)).
• To utilize these NPs as a Surface-Enhanced Raman Scattering (SERS) probe for enhanced detection capabilities.

Main Methods:

• Synthesis of Ag@Fe3O4 core-shell NPs by in situ growth of Fe3O4 NPs on AgNPs.
• Utilizing the combined adsorption of Fe3O4 and SERS activity of Ag for As(V) detection.
• Regeneration of NPs using NaOH solution for cyclic detection.

Main Results:

• Achieved a low detection limit of 10 μg/L for As(V).
• Established a linear relationship between SERS intensity and As(V) concentration (10–500 μg/L).
• Demonstrated successful regeneration and cyclic use of the SERS probe.

Conclusions:

• Multifunctional Ag@Fe3O4 core-shell NPs serve as a highly sensitive SERS probe for As(V) detection.
• The developed probe enables reversible and reliable detection of arsenate in water.
• This technology holds promise for improving drinking water safety through advanced arsenic monitoring.