Gas-sensitive composite material, preparation method and sensor

The invention belongs to the technical field of sealing composite materials, and particularly relates to a gas-sensitive composite material, which is characterized in that a zinc oxide nano-scale fiber material has a nano-scale fiber sheet shape, and a platinum element with a specific proportion is doped on the basis of zinc oxide, so that oxygen vacancies and active sites on the surface of zinc oxide are correspondingly increased, and the gas-sensitive composite material is prepared. The surface adsorption-desorption process of gas molecules is accelerated, the height of a contact barrier is reduced, and methane gas in the transformer can be quickly responded. The molecular sieve material is coated on the zinc oxide nanoscale fiber material, so that the interference of carbon monoxide gas on response can be reduced, the gas leakage fault of the transformer can be accurately monitored, the complicated internal gas environment of the transformer can be processed, and the method is suitable for fault monitoring