Lee, Jongsu Yu, Eui-Sang Kim, Taehyun Kim, In Soo Chung, Seok Kwak, Seung Jae Lee, Won Bo Pak, Yusin Ryu, Yong-Sang 2024-01-19T09:30:42Z 2024-01-19T09:30:42Z 2023-07-13 2023-06 2662-1991 https://pubs.kist.re.kr/handle/201004/113640 Palladium is the most prominent material in both scientific and industrial research on gas storage, purification, detection, and catalysis due to its unique properties as a catalyst and hydrogen absorber. Advancing the dynamic optical phenomena of palladium reacting with hydrogen, transduction of the gas-matter reaction into light-matter interaction is attempted to visualize the dynamic surface chemistry and reaction behaviors. The simple geometry of the metal-dielectric-metal structure, Fabry-Perot etalon, is employed for a colorimetric reactor, to display the catalytic reaction of the exposed gas via water-film/bubble formation at the dielectric/palladium interface. The adsorption/desorption behavior and catalytic reaction of hydrogen and oxygen on the palladium surface display highly repeatable and dramatic color changes based on two distinct water formation trends: the foggy effect by water bubbles and the whiteout effect by water film formation. Simulations and experiments demonstrate the robustness of the proposed Fabry-Perot etalon as an excellent platform for monitoring the opto-physical phenomena driven by heterogeneous catalysis. English SpringerOpen Naked-eye observation of water-forming reaction on palladium etalon: transduction of gas-matter reaction into light-matter interaction Article 10.1186/s43074-023-00097-1 1 PhotoniX, v.4, no.1 PhotoniX 4 1 Y scie scopus 001013760500001 Optics Optics Article PHASE-TRANSITIONS CO OXIDATION HYDROGEN OXYGEN REFLECTION ADSORPTION MICROSCOPY FILMS Palladium Hydrogen Oxygen Fabry-Perot resonators Colorimetric sensors Water-forming reaction