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Photomodulated thermoreflectance detection of hydrogen gas using optically thin palladium film on silicon oxide

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5 Author(s)
Kalli, K. ; Department of Natural Sciences, Faculty of Pure and Applied Sciences, University of Cyprus, P.O. Box 537, 1678 Nicosia, Cyprus ; Othonos, A. ; Christofides, C. ; Spetz, A.
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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. © 1998 American Institute of Physics.

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Review of Scientific Instruments  (Volume:69 ,  Issue: 3 )