Abstract
In this work, we produced a switchable mirror thin film based on a Mg4Ni thin film with a Pd top layer deposited on transparent polymer sheets. The Mg4Ni thin film was prepared on poly(ethylene naphthalate) and poly(ethylene terephthalate) substrates by the DC magnetron cosputtering of Mg and Ni targets followed by in situ covering with a Pd thin layer. The gasochromic switching properties, durability, and response (hydrogenation and dehydrogenation kinetics) were investigated by loading 4% hydrogen in Ar. We found that Pd/Mg4Ni thin film mirrors on a poly(ethylene naphthalate) sheet have superior switching properties. The hydrogenation time (transition from the metallic state to the transparent state) of the sample is almost the same as the hydrogenation time of the same sample prepared on a glass substrate, whereas the dehydrogenation time (transition from the transparent state to the metallic state) is shorter than that of the glass substrate sample. In addition, the switching durability of the sample on the flexible sheet is extended to 200 switching cycles. These results show that the switchable mirror deposited on flexible sheets has a similar performance to the sample on glass substrates.
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