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Updated: Jun 20, 2026

Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

Published on: May 5, 2016

Simple Optical Fiber Sensor for Express and Cross-Sensitive Hydrogen Detection.

Elena Miliutina^1,2, Yuliia Viktosenko¹, Andrii Trelin¹

¹Department of Solid State Engineering, University of Chemistry and Technology, 166 28 Prague, Czech Republic.

|January 7, 2026

Summary

This summary is machine-generated.

A new optical hydrogen sensor uses a plasmon-active fiber coated with palladium and PDMS layers. This sensor offers fast, reliable hydrogen detection with protection against interfering gases and humidity.

Keywords:

PDMS Pd hydrogen detection optical fiber plasmon

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Area of Science:

Materials Science
Sensor Technology
Optical Engineering

Background:

Growing use of hydrogen as an energy source necessitates robust, inexpensive hydrogen sensors.
Existing sensors often lack crucial features like small size, corrosion resistance, and immunity to interfering factors.
Key sensor parameters include sensitivity, selectivity, stability, and remote operation capability.

Purpose of the Study:

To develop a simple, cost-effective optical hydrogen sensor meeting critical performance criteria.
To investigate the efficacy of a plasmon-active optical fiber coated with palladium and PDMS for hydrogen sensing.
To evaluate the sensor's response time, regeneration, operating temperature range, and resistance to environmental factors.

Main Methods:

Fabrication of a sensor using a plasmon-active multimode optical fiber.
Stepwise coating of the fiber with palladium (Pd) and polydimethylsiloxane (PDMS) layers.
Utilizing the shift in plasmon absorption band wavelength due to Pd hydrogenation for hydrogen detection.
Testing sensor performance with various interfering gases (NO2, CH4, CO2, CO, NH3) and humidity.

Main Results:

The Pd layer facilitates hydrogen detection via hydrogenation, causing a significant wavelength shift in the plasmon absorption band.
The additional PDMS layer effectively protects the sensor from interfering gases and moisture.
The sensor exhibits a rapid response time (tens of seconds) and a regeneration time of approximately 2 minutes.
The sensor operates effectively from room temperature to 80 °C, with a minor performance decrease at higher temperatures.

Conclusions:

The developed optical fiber sensor is a simple and effective solution for hydrogen detection.
The sensor meets key requirements for practical hydrogen sensing applications, including speed, protection, and operational range.
This technology holds promise for safe and widespread hydrogen utilization.