Production strategies of tinx coatings via reactive high power impulse magnetron sputtering for selective h2 separation

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Abstract

This scientific work aims to optimize the preparation of titanium nitride coatings for selective H2 separation using the Reactive High Power Impulse Magnetron Sputtering technology (RHiPIMS). Currently, nitride-based thin films are considered promising membranes for hydrogen. The first series of TiNx/Si test samples were developed while changing the reactive gas percentage (N2%) during the process. Obtained coatings were extensively characterized in terms of morphology, composition, and microstructure. A 500 nm thick, dense TiNx coating was then deposited on a porous alumina substrate and widely investigated. Moreover, the as-prepared TiNx films were heat-treated in an atmosphere containing hydrogen in order to prove their chemical and structural stability; which revealed to be promising. This study highlighted how the RHiPIMS method permits fine control of the grown layer’s stoichiometry and microstructure. Moreover, it pointed out the need for a protective layer to prevent surface oxidation of the nitride membrane by air and the necessity to deepen the study of TiNx/alumina interface in order to improve film/substrate adhesion.

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Mortalò, C., Deambrosis, S. M., Montagner, F., Zin, V., Fabrizio, M., Pasquali, L., … Miorin, E. (2021). Production strategies of tinx coatings via reactive high power impulse magnetron sputtering for selective h2 separation. Membranes, 11(5). https://doi.org/10.3390/membranes11050360

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