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Nanocrystalline TiO2 Sensitive Layer for Plasmonic Hydrogen Sensing.

Enrico Gazzola1, Michela Cittadini2, Marco Angiola2

  • 1Department of Physics and Astronomy "G. Galilei", University of Padova, Via Marzolo 8, 35131 Padova, Italy.

Nanomaterials (Basel, Switzerland)
|August 6, 2020
PubMed
Summary

This study compares two plasmonic sensors for hydrogen detection using titanium dioxide (TiO2) films. Differences in hydrogen response were explained by TiO2

Keywords:
gold nanoparticleshydrogenoptical sensorsplasmonic sensorstitania

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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.