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Title: Photomodulated thermoreflectance detection of hydrogen gas using optically thin palladium film on silicon oxide
Authors: Kalli, Kyriacos 
Othonos, Andreas S. 
Christofidès, Constantinos
Keywords: Photothermal spectroscopy;Palladium;Hydrogen;Chemisorption;Silicon oxide
Issue Date: 1998
Publisher: AIP American Institute of Physics Inc.
Source: Review of Scientific Instruments,1998, Volume 69, Issue 3, Pages 1505-1511
Abstract: The sensitivity of various thicknesses of optically thin film palladium layers evaporated onto silicon oxide substrate is investigated in the presence of a hydrogen/air atmosphere at room temperature. The magnitude of the resulting reflectivity change is measured using an excite-probe technique, through laser excited photothermal modulation of a probe beam. This allows for the recovery of information from both the amplitude and phase channels of the hydrogen sensor output. Data indicates that concentrations of 0.1% hydrogen in the presence of a balanced air mixture and at room temperature may be measured with an 8 nm palladium film. The presence of inhomogeneities in the palladium layers leads to anomalous behavior.
ISSN: 0034-6748
DOI: 10.1063/1.1148787
Rights: © 1998 American Institute of Physics.
Type: Article
Appears in Collections:Άρθρα/Articles

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