Hydrogen induced changes in the optical properties of Pd capped V thin films
2013 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 580, no Suppl. 1, S114-S118 p.Article in journal (Refereed) Published
Optical properties of 50 nm thick single crystal vanadium films deposited on double side polished MgO substrates have been obtained from spectrophotometric measurements. The films were coated with a polycrystalline Pd layer (5 nm thick) to protect them from oxidation and to favor absorption of atomic hydrogen. Electrical resistance was recorded while hydrogen pressure was increased slowly up to 750 mbar keeping temperature constant. Simultaneously, under normal incidence of non-polarized radiation [350-950 nm], transmittance spectra of this Pd/V/MgO system were measured. These were numerically inverted to obtain the spectral behavior of the Pd, V. PdHy, and VHx dielectric functions at 22 and 140 degrees C, and at 750 mbar. Hydrogen concentration in V film was first determined from a resisto-optical method. Finally, we demonstrate the possibility to determine the concentration in the Pd and the V layers independently, solely using the changes in the optical transmission.
Place, publisher, year, edition, pages
2013. Vol. 580, no Suppl. 1, S114-S118 p.
Hydrogen storage materials, Thin films, Metals, Light absorption and reflection, Optical properties
IdentifiersURN: urn:nbn:se:uu:diva-215278DOI: 10.1016/j.jallcom.2013.03.146ISI: 000328172400031OAI: oai:DiVA.org:uu-215278DiVA: diva2:687101