Thin Film TaFe, TaCo, and TaNi as Potential Optical Hydrogen Sensing Materials.

Autor:	Bannenberg LJ; Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, JB Delft 2629, The Netherlands., Veeneman IM; Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, JB Delft 2629, The Netherlands., Straus FIB; Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, JB Delft 2629, The Netherlands., Chen HY; Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, JB Delft 2629, The Netherlands., Kinane CJ; ISIS Neutron Source, Rutherford Appleton Laboratory, STFC, UKRI, Didcot OX11 0S8X, United Kingdom., Hall S; ISIS Neutron Source, Rutherford Appleton Laboratory, STFC, UKRI, Didcot OX11 0S8X, United Kingdom., Thijs MA; Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, JB Delft 2629, The Netherlands., Schreuders H; Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, JB Delft 2629, The Netherlands.
Jazyk:	angličtina
Zdroj:	ACS omega [ACS Omega] 2024 Sep 26; Vol. 9 (40), pp. 41978-41989. Date of Electronic Publication: 2024 Sep 26 (Print Publication: 2024).
DOI:	10.1021/acsomega.4c06955
Abstrakt:	This paper studies the structural and optical properties of tantalum-iron-, tantalum-cobalt-, and tantalum-nickel-sputtered thin films both ex situ and while being exposed to various hydrogen pressures/concentrations, with a focus on optical hydrogen sensing applications. Optical hydrogen sensors require sensing materials that absorb hydrogen when exposed to a hydrogen-containing environment. In turn, the absorption of hydrogen causes a change in the optical properties that can be used to create a sensor. Here, we take tantalum as a starting material and alloy it with Fe, Co, or Ni with the aim to tune the optical hydrogen sensing properties. The rationale is that alloying with a smaller element would compress the unit cell, reduce the amount of hydrogen absorbed, and shift the pressure composition isotherm to higher pressures. X-ray diffraction shows that no lattice compression is realized for the crystalline Ta body-centered cubic phase when Ta is alloyed with Fe, Co, or Ni, but that phase segregation occurs where the crystalline body-centered cubic phase coexists with another phase, as for example an X-ray amorphous one or fine-grained intermetallic compounds. The fraction of this phase increases with increasing alloyant concentration up until the point that no more body-centered cubic phase is observed for 20% alloyant concentration. Neutron reflectometry indicates only a limited reduction of the hydrogen content with alloying. As such, the ability to tune the sensing performance of these materials by alloying with Fe, Co, and/or Ni is relatively small and less effective than substitution with previously studied Pd or Ru, which do allow for a tuning of the size of the unit cell, and consequently tunable hydrogen sensing properties. Despite this, optical transmission measurements show that a reversible, stable, and hysteresis-free optical response to hydrogen is achieved over a wide range of hydrogen pressures/concentrations for Ta-Fe, Ta-Co, or Ta-Ni alloys which would allow them to be used in optical hydrogen sensors. Competing Interests: The authors declare the following competing financial interest(s): Two of the authors are listed as inventor on a patent for these materials owned by Delft University of Technology entitled: Optical Thin-Film Hydrogen Sensing Material Based on Tantalum or Other Group V Element Alloy. (© 2024 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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