▎ 摘　　要

NOVELTY - A gasochromic nanocomposite material comprises molybdenum trioxide nanoflakes, and palladium nanoparticles and nickel nanoparticles arranged on the surface of molybdenum trioxide nanoflakes. USE - Gasochromic nanocomposite material used in sensor (claimed) for detecting hydrogen. ADVANTAGE - The gasochromic nanocomposite material is capable of sensing a wide concentration of hydrogen and maintains color changed by exposure to hydrogen for a long period of time. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: manufacture of the gasochromic nanocomposite material, which involves (i) pulverizing molybdenum oxide powder to form the molybdenum trioxide nanoflakes, mixing a solution (a) containing a palladium precursor and a solution (b) in which the molybdenum trioxide nanoflakes are dispersed, photo-reducing a palladium of the palladium precursor for forming palladium nanoparticles on the molybdenum trioxide nanoflakes by irradiating UV rays, and (ii) forming a nanocomposite (A), and a nanocomposite (B) in which nickel nanoparticles are formed on surface of the nanocomposite (A) by adding the nanocomposite (A) to a solution (c) containing a nickel precursor and photo-reducing nickel of the nickel precursor by irradiating UV rays; and a hydrogen sensor (100), which comprises a substrate (110), and a sensing layer (120) formed on the substrate and including the gasochromic nanocomposite material. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the hydrogen sensor. 100Hydrogen sensor 110Substrate 120Sensing layer