Ammonia fluorescence sensor as well as preparation method and application thereof

The invention provides an ammonia fluorescence sensor and a preparation method and application thereof.The ammonia fluorescence sensor comprises a substrate, a liquid crystal orientation layer, a grid, nematic liquid crystals combined with an aggregation-induced emission material and a surfactant, the grid is located on the substrate, the substrate is modified with the liquid crystal orientation layer, and the surface active agent is located on the liquid crystal orientation layer. The liquid crystal orientation layer comprises metal ions, the lower part of the nematic liquid crystal combined with the aggregation-induced emission material is combined with the metal ions in the liquid crystal orientation layer, and the upper part of the nematic liquid crystal combined with the aggregation-induced emission material is combined with the surfactant, so that the nematic liquid crystal combined with the aggregation-induced emission material is arranged in order perpendicular to the substrate; and the liquid crystal