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Stabilized switchable “black state” in Mg2NiH4/Ti/Pd thin films for optical hydrogen sensing

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8 Author(s)
Pasturel, M. ; Condensed Matter Physics, Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081HV Amsterdam, The Netherlands ; Slaman, M. ; Borsa, D.M. ; Schreuders, H.
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A triple layer thin film (30 nm Mg2Ni/100 nm Ti/10 nm Pd sputtered on glass) switches reversibly from a shiny metallic to a “black” state upon exposure to moderate hydrogen pressure (≈5.103 Pa). This black state resembles that obtained in thick Mg2NiHx layers and has the great advantage of being stable and easily controlled. Both the reversible high optical contrast (Rreflective/Rblack≈10 in the red wavelength range) and the fast kinetics of hydrogen absorption and desorption make this material interesting for applications as optical hydrogen sensors.

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Applied Physics Letters  (Volume:89 ,  Issue: 2 )