Flexible humidity sensor and preparation method thereof

The invention discloses a flexible humidity sensor based on Nb2CTx and a preparation method thereof.The flexible humidity sensor is prepared from an Nb2CTx nanosheet through oxidation, the preparation method of the Nb2CTx nanosheet comprises the following steps that 1, Nb2AlC powder is added into an HCl-LiF etching solution, deionized water is used for cleaning the etching solution after stirring is conducted till the pH value of the solution reaches a certain value, and the Nb2CTx nanosheet is obtained; collecting a bottom layer precipitate, wherein the precipitate is multilayer Nb2CTx; and 2) dispersing the collected precipitate in a LiCl solution, stirring at room temperature, then carrying out ultrasonic treatment, centrifuging until the supernate becomes black after the ultrasonic treatment is completed, and drying the supernate in a vacuum drying oven to prepare the Nb2CTx nanosheet. The Nb2CTx nanosheet is subjected to in-situ oxidation treatment, and compared with a humidity sensor of the Nb2CTx nanos