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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

A vapor sensor array using multiple localized surface plasmon resonance bands in a single UV-vis spectrum.

Kuan-Jen Chen¹, Chia-Jung Lu

¹Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan, ROC.

|May 6, 2010

Summary

This study presents a novel nanoparticle sensor array for detecting volatile organic compounds (VOCs). The array uses surface-modified nanoparticles to generate unique response patterns, enabling sensitive and rapid chemical detection.

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Area of Science:

Nanotechnology
Chemical Sensing
Spectroscopy

Background:

Localized Surface Plasmon Resonance (LSPR) is a phenomenon exploited in various sensing applications.
Developing selective and sensitive sensors for volatile organic compounds (VOCs) remains a significant challenge in environmental monitoring and diagnostics.

Purpose of the Study:

To develop and characterize a sensor array based on surface-modified nanoparticles for the detection of VOCs.
To investigate the sensor array's response patterns and performance metrics, including sensitivity, response time, and reversibility.

Main Methods:

Fabrication of a sensor array using three types of nanoparticles (Ag, Au, Au nano-shells) modified with different thiols (decanethiol, naphthalene thiol, 2-mercaptobenzothiazole).
Utilizing UV-vis spectroscopy to measure the ensemble of LSPR bands and analyze response patterns.
Testing the sensor array's response to nine different VOCs to assess its detection capabilities.

Main Results:

The sensor array exhibited distinct response patterns for different VOCs based on the simultaneous measurement of LSPR bands.
Achieved reversible and rapid (approx. 8s) responses with a wide linear range.
Demonstrated a low detection limit of 16 ppm for anisole.

Conclusions:

The developed nanoparticle-based sensor array offers a promising platform for sensitive and selective VOC detection.
The unique response patterns generated by the LSPR shifts provide a basis for differentiating various chemical compounds.
This technology has potential applications in environmental monitoring, industrial safety, and medical diagnostics.