Nanocrystalline TiO₂ Sensitive Layer for Plasmonic Hydrogen Sensing

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Titanium dioxide (TiO2) anatase films are explored for hydrogen gas (H2) detection.
• Plasmonic sensors offer high sensitivity for gas analysis.
• Understanding sensor response mechanisms is crucial for developing advanced H2 detectors.

Purpose of the Study:

• To investigate and explain the distinct H2 responses of two plasmonic sensor configurations.
• To elucidate the role of hydrogen dissociation on TiO2 and gold nanoparticle photocatalysis in sensor performance.

Main Methods:

• Fabrication of a solution-processed TiO2 anatase film as the sensitive layer.
• Implementation of two plasmonic sensor setups: grating-coupled surface plasmon resonance (SPR) and localized SPR (LSPR) with gold nanoparticles.
• Comparative analysis of H2 detection performance between the SPR and LSPR sensor configurations.

Main Results:

• Observed differences in H2 response between the grating-coupled SPR sensor and the LSPR sensor.
• Correlation of sensor response variations with high-temperature hydrogen dissociation on TiO2.
• Attribution of specific response characteristics to the photocatalytic activity of gold nanoparticles in the LSPR sensor.

Conclusions:

• The study successfully elucidated the differing H2 responses in the two sensor types.
• Hydrogen dissociation on TiO2 at high temperatures and gold nanoparticle photocatalysis are key factors influencing sensor performance.
• Findings provide insights into designing more effective TiO2-based plasmonic hydrogen sensors.