Pt-doped composite inorganic metal oxide nanoparticles, and preparation method and application thereof

The invention provides Pt-doped composite inorganic metal oxide nanoparticles as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving a soluble metal source and chloroplatinic acid in a first polar solvent to form a solution A; wherein the soluble metal source is selected from at least two of soluble ferric salt, soluble zinc salt, soluble lanthanum salt and titanate; s2, dissolving urea in a second polar solvent to form a solution B; s3, heating the solution A, and adding the solution B into the solution A in a stirring state to form a solution C; s4, the solution C is cooled and aged, then centrifugal separation is conducted, and a precursor material is obtained; and step S5, sequentially drying and calcining the precursor material to obtain the Pt-doped composite inorganic metal oxide nanoparticles. According to the invention, the problem of insufficient gas sensitivity or photocatalytic performance of inorganic metal nanoparticles is so