Angle-dependence-free structural color hydrogel film as well as preparation method and application thereof

The invention discloses an angle-dependence-free structural color hydrogel film as well as a preparation method and application thereof, and belongs to the technical field of structural color materials, the preparation method comprises the following steps: (1) preparing SiO2 nano microspheres with good uniformity; (2) uniformly spraying SiO2 nano microspheres on the surface of inorganic glass treated by a Piranha solution to form an amorphous structure template with short-range order and long-range disorder; and (3) filling a precursor solution of a responsive substance containing pH and CO2 into the template prepared in the step (2) by a'sandwich 'method, and after ultraviolet curing, obtaining the angle-dependence-free structural color hydrogel film capable of visually detecting the pH and CO2 gas concentration by a sacrifice template method. The preparation method is simple and high in controllability, and the prepared structural color material is good in optical performance and free of angle dependence an