Optical Hydrogen Sensing Properties of e-Beam WO3 Films Decorated with Gold Nanoparticles

Tungsten oxide thin films with different thicknesses, crystallinity and morphology were synthesized by e-beam deposition followed by thermal treatment and acid boiling. The films with different surface morphologies were coated with gold nanoparticles and tested as optical sensing materials towards h...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2023-02, Vol.23 (4), p.1936
Main Authors: Colusso, Elena, Rigon, Michele, Corso, Alain Jody, Pelizzo, Maria Guglielmina, Martucci, Alessandro
Format: Article
Language:English
Subjects:
Ammonia
Crystallinity
Crystallization
e-beam deposition
Electron beams
Ellipsometry
Gases
Glass substrates
Gold
gold nanoparticles
Heat treatment
Hydrogen
hydrogen sensing
Metal oxides
Nanoparticles
Nitrogen dioxide
optical sensors
Scanning electron microscopy
Selectivity
Sensors
Thickness
Thin films
tungsten oxide
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Description
Summary:Tungsten oxide thin films with different thicknesses, crystallinity and morphology were synthesized by e-beam deposition followed by thermal treatment and acid boiling. The films with different surface morphologies were coated with gold nanoparticles and tested as optical sensing materials towards hydrogen. X-ray diffraction, scanning electron microscopy, ellipsometry and UV-VIS spectroscopy were employed to characterize the structural, morphological and optical properties of the film. We demonstrated a good response towards hydrogen in air, reaching a good selectivity among other common reducing gases, such as ammonia and carbon monoxide. The sensitivity has been proven to be highly dependent on the thickness and crystallinity of the samples.
ISSN:1424-8220
1424-8220
DOI:10.3390/s23041936