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CoFe2O4@HNTs/AuNPs Substrate for Rapid Magnetic Solid-Phase Extraction and Efficient SERS Detection of Complex
Huadong Zhang1, Huasheng Lai1, Xiangrong Wu1
1School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China.
Analytical Chemistry
|February 19, 2020
Summary
A novel magnetic substrate combining halloysite nanotubes and gold nanoparticles enables rapid, on-site detection of aromatic amines and nitrofurans. This advanced material simplifies sample preparation and enhances detection sensitivity for practical applications.
Area of Science:
- Materials Science
- Analytical Chemistry
- Nanotechnology
Background:
- On-site detection of contaminants requires fast and accurate methods.
- Traditional sample pretreatment is often complex and time-consuming.
- Developing efficient substrates for simultaneous extraction and detection is crucial.
Purpose of the Study:
- To develop a novel magnetic solid-phase extraction (MSPE) substrate for surface-enhanced Raman scattering (SERS) detection.
- To enable rapid and efficient simultaneous detection of aromatic amines and nitrofurans in real samples.
- To create a robust substrate with enhanced SERS activity and simplified sample pretreatment.
Main Methods:
- Fabrication of a composite substrate using magnetic CoFe2O4 nanoparticles embedded in halloysite nanotubes (HNTs), coated with gold nanoparticles (AuNPs).
- Utilized the magnetic properties of CoFe2O4@HNTs for rapid solid-phase extraction and separation.
- Employed AuNPs on the surface for electromagnetic enhancement of SERS signals.
- Validated the substrate for detecting 4,4'-thioaniline and nitrofurantoin in various real-world samples.
Main Results:
- The CoFe2O4@HNTs/AuNPs substrate demonstrated excellent SERS activity, high sensitivity, and good reproducibility.
- Achieved rapid magnetic separation within 5 minutes and maintained pH stability from 3.0 to 11.0.
- Determined 4,4'-thioaniline and nitrofurantoin with low limits of detection (0.026 mg/L and 0.014 mg/L, respectively).
- Demonstrated high recoveries (71.6%-116.3%) in practical sample analysis, including cosmetics, fish feed, and aquatic samples.
- Achieved a significant enhancement factor (EF) of up to 2.7 × 10^7 for 4,4'-thioaniline.
Conclusions:
- The developed MSPE-SERS substrate offers a robust and efficient platform for rapid on-site detection of target analytes.
- The composite material simplifies sample pretreatment and reduces matrix interference, enabling analysis within 15 minutes.
- This methodology provides a promising approach for developing advanced HNTs-based composite materials for various analytical applications.
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