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Author Spotlight: Development and Application of SERS Flexible Substrates Using Synthesized AgNPs

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Published on: November 17, 2023

Localized Surface Plasmon Resonance-Based Gas Sensor with a Metal-Organic-Framework-Modified Gold Nano-Urchin

Cong Wang¹, Hao Guo¹, Bin Chen²

¹Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan.

Sensors (Basel, Switzerland)

|November 13, 2025

Summary

This study introduces a novel localized surface plasmon resonance (LSPR) gas sensor using gold nano-urchins coated with ZIF-8. This sensor enables sensitive, visualized detection of volatile organic compounds (VOCs) and their spatial distribution.

Keywords:

Au nano-urchins ZIF-8 gas visualization localized surface plasmon resonance volatile organic compounds

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Area of Science:

Nanomaterials Science
Chemical Sensing
Environmental Monitoring

Background:

Conventional gas sensors lack selectivity and spatial information for volatile organic compound (VOC) monitoring.
Localized surface plasmon resonance (LSPR) offers potential for sensitive gas detection.
Zeolitic imidazolate frameworks (ZIFs) are promising materials for gas adsorption and sensing applications.

Purpose of the Study:

To develop a localized surface plasmon resonance (LSPR) based gas sensor for quantitative detection and visualization of VOCs.
To utilize gold (Au) nano-urchins coated with zeolitic imidazolate framework (ZIF-8) for enhanced VOC sensing.
To enable real-time imaging and spatial mapping of VOC plumes.

Main Methods:

Fabrication of Au nano-urchin substrates immobilized on glass and coated with ZIF-8 crystals.
Optimization of ZIF-8 growth duration for maximal plasmonic response using scanning electron microscopy and optical analysis.
Utilizing spectrometer-based and camera-based LSPR systems for quantitative detection and visualization of VOCs (2-pentanone, acetic acid, ethyl acetate).

Main Results:

Optimal ZIF-8 growth (90 min) on Au nano-urchins yielded the strongest plasmonic response.
The sensor demonstrated concentration-dependent detection of VOCs with low detection limits (12.7-36.3 ppm).
A camera-based LSPR platform provided real-time visualization of VOC plumes and diffusion patterns.

Conclusions:

ZIF-8-modified Au nano-urchin substrates enable sensitive and reproducible VOC detection.
The developed sensor transforms plasmonic sensing into a visual modality for spatial VOC analysis.
This approach opens avenues for integrated LSPR-surface-enhanced Raman scattering (SERS) dual-mode gas sensing.