Abstract
Gasochromic switchable films are materials in which light transmittance properties are influenced by gases. In this study, Pt nanoparticle-dispersed tungsten trioxide (Pt-WO 3 ) gasochromic switchable films were fabricated without heat treatment from a precursor solution containing oxalic acid. The fabricated films exhibited a porous structure with uniformly dispersed Pt nanoparticles. X-ray photoelectron spectroscopy profiles confirmed the reduction of Pt ions to metallic Pt. The fabricated Pt-WO 3 films changed from being colorless and transparent to blue and transparent when exposed to 4% H 2 –N 2 gas and transformed back to the colorless transparent state when exposed to air. In particular, the coloration of this film by H 2 gas was faster than decolorization by air, and its durability was confirmed for 400 switching cycles. This fabrication method does not require a high-temperature sintering process, and the films can be fabricated at room temperature, making the method applicable to substrates with low heat resistances. • Pt-WO 3 precursor for gasochromic switchable films was prepared using oxalic acid. • The Pt-WO 3 films were fabricated at room temperature without any heat treatment. • The films were porous and contained uniformly dispersed Pt nanoparticles.
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