Palladium monatomic modified tin oxide composite material as well as preparation method and application thereof

The invention belongs to the field of gas-sensitive sensing materials, and particularly relates to a palladium monatomic modified tin oxide composite material as well as a preparation method and application thereof. The preparation method comprises the steps of: sufficiently and evenly dispersing tin oxide particles in water, adding tetraamminepalladium nitrate into dispersion liquid, and carrying out solid-liquid separation and washing after sufficient stirring to obtain a palladium precursor ion modified tin oxide composite structure; and subjecting the palladium precursor ion modified tin oxide composite structure to rapid heating and high-temperature calcination to obtain the palladium monatomic modified tin oxide composite structure, wherein the heating speed ensures that the palladium precursor ions are rapidly anchored by the tin oxide particles and prevented from being gathered on the surfaces of the tin oxide particles. The palladium monatomic modified tin oxide composite material prepared by the inv