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A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants

A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants

Published on: February 19, 2016

Bimetallic AuPt nanoparticles-based SERS substrate for high-performance endosulfan detection.

Nguyen Dac Dien¹, Xuan Hoa Vu², Thi Thu Ha Pham³

¹Faculty of Occupational Safety and Health, Vietnam Trade Union University 169 Tay Son Street, Kim Lien Ward Ha Noi City 10000 Vietnam.

|April 13, 2026

Summary

A new bimetallic gold-platinum nanoparticle (AuPt NP) substrate enhances surface-enhanced Raman spectroscopy (SERS) for detecting the pesticide endosulfan (ES). This AuPt NP SERS platform offers high sensitivity and stability for trace pesticide analysis.

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Area of Science:

Materials Science
Analytical Chemistry
Nanotechnology

Background:

Surface-enhanced Raman spectroscopy (SERS) is crucial for trace pesticide detection in food and environmental samples.
Detecting the hazardous organochlorine pesticide endosulfan (ES) at low concentrations remains challenging due to its stability.

Purpose of the Study:

To develop a novel SERS substrate for sensitive and rapid detection of endosulfan (ES).
To investigate the potential of bimetallic gold-platinum nanoparticles (AuPt NPs) as an effective SERS platform.

Main Methods:

Bimetallic AuPt nanoparticles (NPs) were synthesized via precursor reduction.
Nanomaterials were characterized using TEM, HRTEM, XRD, EDS, and UV-vis spectroscopy.
SERS performance was evaluated using endosulfan as the probe analyte.

Main Results:

AuPt NPs with a 1:1 Au:Pt molar ratio demonstrated optimal SERS performance.
An enhancement factor (EF) of ~14.3 × 10^6 and a limit of detection (LOD) of 0.05 ppm for endosulfan were achieved.
The substrate exhibited good repeatability, signal uniformity, and storage stability.

Conclusions:

The enhanced SERS performance is attributed to the synergistic effects of alloy composition, nanoparticle morphology, and hotspot generation.
Electromagnetic enhancement is the dominant mechanism, supported by electronic interactions between AuPt NPs and endosulfan molecules.
AuPt NPs represent a promising SERS-active platform for sensitive endosulfan detection.