Nest-like hydrated tungsten trioxide film can be prepared by a self-seeding hydrothermal growth method. The hydrated WO3 film can also be prepared by the seed-assisted hydrothermal method, but the obtained film is not uniform enough, and the electron transport speed and transmission efficiency are not ideal. In this regard, experts say that the simplest method is to eliminate the seed layer in the hydrothermal process, thereby solving the problem of film uniformity and improving the electron transport speed and transmission efficiency.
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Experts proposed a self-seeding hydrothermal growth mechanism and prepared a porous nest-like WO3 film of two-dimensional nanosheets. Such film can eliminate the influence of the seed layer on the prepared film. And a porous hydrated WO3 nanosheet film uniformly distributed on the surface of the FTO conductive glass and firmly bonded to the substrate. The nest-like hydrated WO3 film grown from the seed crystal has better electrochromic performance than the hydrated WO3 film prepared by the seed-assisted hydrothermal method under the same conditions. Also it has stable cycle stability. The self-seeding hydrothermal WO3 film plays a role in the research of the seed layer in the hydrothermal process, and has a very good application prospect in the field of electrochromism in the future.
