Composite powder based on natural polyphenol acid as well as preparation method and application of composite powder

The invention belongs to the technical field of material photochemical detection, and provides composite powder based on natural polyphenolic acid as well as a preparation method and application of the composite powder based on the natural polyphenolic acid, and the preparation method comprises the following steps: mixing a natural polyphenolic acid solution, a natural smithsonite solution and an inorganic salt solution; the organic-inorganic composite material with a core-shell structure is prepared by mixing the natural polyphenolic acid with alkyl silane after dehydration condensation reaction, and the natural polyphenolic acid on the outer layer is a flexible conjugated molecule with an electron supply-withdrawing effect and can rotate to different degrees in solutions with different viscosities. Excited state energy can be dissipated in different dissipation modes, so that the surface sightseeing signal release intensity is greatly different, and the method can be used for detecting the micro-area viscos