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Author Spotlight: Advancements and Applications in Nanoparticle Synthesis Through Laser Ablation in Liquids

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Highly Sensitive Molecular Detection Using Tapered Fiber with Ag Nanoparticle Self-Assembled Film for

Xiaohua Yang¹, Yafei Shi¹, Jixiang Fang¹

¹Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.

Analytical Chemistry

|December 11, 2025

Summary

This study introduces a tapered-fiber-coated confined-enhanced Raman spectroscopy (CERS) platform for highly sensitive detection. The novel TF-CERS system achieves ultra-low limits for detecting pollutants in water samples.

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

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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

Area of Science:

Analytical Chemistry
Materials Science
Spectroscopy

Background:

Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity but can suffer from signal instability.
Confined-enhanced Raman spectroscopy (CERS) aims to improve sensitivity and uniformity through molecular anchoring.
Tapered fibers enhance light-field compression and evanescent waves, creating localized plasmonic fields.

Purpose of the Study:

To develop a tapered-fiber-coated CERS platform (TF-CERS) for enhanced detection sensitivity and signal stability.
To investigate the analytical performance of the TF-CERS platform for detecting various contaminants.
To assess the potential of TF-CERS for environmental pollution monitoring.

Main Methods:

Fabrication of the TF-CERS platform using a vertical dip-coating method for uniform silver nanoparticle (Ag NP) modification.
Incorporation of a NaCl-induced packaged active shell for effective molecular anchoring and signal stabilization.
Utilizing the TF-CERS platform for ultrasensitive detection of crystal violet (CV) and multiplex detection in real water samples.

Main Results:

Achieved an ultralow detection limit of 4.37 × 10^-14 M for crystal violet (CV) with a relative standard deviation (RSD) of 5.99%.
Demonstrated highly sensitive multiplex detection of dye molecules (R6G, MG) and pesticide residues (thiram, carbendazim) in environmental water samples.
Exhibited excellent analytical performance, highlighting the platform's reliability and sensitivity.

Conclusions:

The developed TF-CERS platform significantly enhances detection sensitivity and signal stability for SERS applications.
TF-CERS offers a promising, highly sensitive, and reliable solution for real-time environmental pollution monitoring.
The technology holds substantial potential for practical applications in detecting trace contaminants in complex matrices.