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Related Experiment Video

Updated: Jun 20, 2026

Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition

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A Catalytic-Plasmonic Pt Nanoparticle Sensor for Hydrogen Detection in High-Humidity Environments.

Athanasios Theodoridis¹, Carl Andersson¹, Sara Nilsson¹

¹Department of Physics, Chalmers University of Technology, SE 412 96 Gothenburg, Sweden.

|November 18, 2025

Summary

This summary is machine-generated.

This study introduces a novel catalytic-plasmonic optical sensor for detecting hydrogen gas in humid air. This advanced sensor overcomes previous limitations, enabling reliable hydrogen detection even in high humidity environments for enhanced safety.

Keywords:

Pt nanoparticles catalytic sensing humidity hydrogen sensor nanoplasmonic sensing

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Area of Science:

Materials Science
Chemical Engineering
Sensor Technology

Background:

Hydrogen energy technologies are crucial for reducing CO2 emissions, but hydrogen safety is a significant challenge, especially in humid environments.
Existing hydrogen detection technologies often fail or perform poorly in high humidity conditions.
Reliable hydrogen sensing in diverse environmental conditions is essential for the widespread adoption of hydrogen energy.

Purpose of the Study:

To develop and demonstrate a novel catalytic-plasmonic optical hydrogen sensor.
To enable accurate hydrogen gas detection in environments with high humidity (0-80% RH).
To establish a new paradigm for hydrogen sensors, particularly for challenging, humid applications.

Main Methods:

Utilized nanofabricated, plasmonically active Platinum (Pt) nanoparticles as transducer elements.
Leveraged the catalytic activity of Pt nanoparticles for hydrogen oxidation and their plasmonic properties for dielectric sensing.
Tested sensor performance across a wide humidity range (0-80% RH) at various operating temperatures (80°C and 100°C).

Main Results:

Achieved a limit of detection of 30-50 ppm hydrogen in air at 100°C and 80°C, respectively.
Demonstrated consistent and stable hydrogen detection for over 143 hours in 80% relative humidity.
Observed a unique sensor response where signal magnitude increases with humidity at higher hydrogen concentrations, unlike conventional sensors.

Conclusions:

The catalytic-plasmonic optical sensor effectively detects hydrogen in highly humid air, addressing a critical gap in current technology.
This sensor exhibits unprecedented performance in humid environments, showing increased sensitivity with humidity, a reversal of typical sensor behavior.
Catalytic-plasmonic sensors represent a promising new approach for robust hydrogen detection, particularly for safety applications in humid conditions.