High-sensitivity ammonia gas sensor and preparation method thereof

The invention relates to a high-sensitivity ammonia gas sensor and a preparation method thereof. The high-sensitivity ammonia gas sensor comprises a gold interdigital electrode substrate and a gas sensitive material layer, wherein the gold interdigital electrode substrate is composed of an aluminum oxide ceramic substrate on the lower layer and a gold interdigital electrode fixed to the surface ofthe aluminum oxide ceramic substrate, and the surface of the gold interdigital electrode is coated with the gas sensitive material layer; and the main component of the gas sensitive material layer isprecious metal ruthenium modified tungsten oxide, sodium tungstate is adopted as a tungsten source, and ruthenium chloride is adopted as a precious metal source. According to the high-sensitivity ammonia gas sensor and the preparation method thereof, the gas sensitive material is deposited on the gold interdigital electrode by using a 3D printing method, the gas sensitive film with controllable thickness and shape can be conveniently and quickly obtained, and the preparation method is simple, low in manufacturing cost and suitable for large-scale production; and the modification of the precious metal ruthenium enhances the surface activity of the gas-sensitive material, and promotes the reaction between a gas to be detected and the gas-sensitive material, thereby further enhancing the gas-sensitive property.