Ionic gel film preparation method, chemical sensor and preparation method thereof

A preparation method of ionic gel film, wherein the ionic gel comprises a poly(ionic liquid) and a vinyl-free ionic liquid monomer, the ionic gel is formed by compounding the vinyl-free ionic liquid monomer with the poly(ionic liquid), the poly(ionic liquid) is formed through the polymerization of ionic liquid monomers containing C═C double bonds to form a skeleton, while the vinyl-free ionic liquid monomer exists as free-state small molecules within the poly(ionic liquid), the preparation method comprises:

• blending a vinyl-free ionic liquid with a vinyl-containing ionic liquid and a specified additive to obtain a homogenous solution, wherein the concentration of the vinyl-free ionic liquid is less than or equal to the concentration of the vinyl-containing ionic liquid, the additive is at least one of photoinitiators, crosslinkers, and plasticizers,
• taking a predetermined amount of the homogenous solution and dropping it onto a first substrate equipped with interdigital electrodes,
• flattening the homogenous solution on the first substrate using a second substrate,
• curing the flattened homogenous solution on the first substrate using ultraviolet light of a preset wavelength,
• and, curing until the vinyl-containing ionic liquid polymerizes in situ to form an ionic gel film.