Dual-mode humidity sensor based on nickel iodide and preparation method of humidity sensor

The invention provides a dual-mode humidity sensor based on optical/electrical sensitive characteristics of nickel iodide and a preparation method of the humidity sensor. The method comprises the preparation steps that the nickel iodide (NiI ) is dissolved in a solvent, stirring is performed under a heating condition to obtain a sensitive material, the sensitive material is transferred to different substrates, and humidity-sensitive characteristics of the sensitive material are tested. The result indicates that the material has a reversible black-transparent color changing behavior along with humidity changing, and the material shows an electrical sensitive behavior on humidity and also shows excellent sensitive characteristics under low humidity and even ultralow humidity. The dual-modehumidity sensor prepared based on a flexible substrate provided with an interdigital electrode has excellent optical and electrical sensitive characteristics. The sensitivity properties of the devicebasically maintain consiste