Preparation And Research Of Composite Films Of Polyimide With Zinc Oxide/Tin Oxide, Lead Sulfide Feature Film

As a new generation of semiconductor material, zinc tin oxide and lead sulfide have excellent photoelectric properties and photosensitive properties that other materials do not have. They can be used in solar cells, sensors, and so on. At the same time, as a kind of polymer materials polyimide has excellent mechanical properties, thermal stability properties, chemical resistance and electrical properties. It can be substrate for inorganic functional layer such as zinc oxide, tin oxide and lead sulfide to make flexible composite films, which greatly expands the use of semiconductor thin films. In this article, we used the method of directly pyrolysis, in situ ion exchange and dopingto prepare the composite films of polyimide containing zinc oxide and tin oxide, and the method of ion exchange/surface and interface reaction to prepare polyimide composite lead sulfide film, we observe the characterization and surface morphology of this thin films. The main works are as follow.1 We used the finished polyimide film, the film made of polyamic acid and the polyamic acid film containing stannous chloride orzinc acetylacetonate as the substrate, through ion exchange and heat treatment to produce a polyimide composite film comprising zinc oxide and tin dioxide polyimide composite film. We determined the composition of crystalline inorganic layer of the surface of the film by X-ray diffraction, determined the surface morphology of the inorganic layer of the film by scanning electron microscopy, and obtained elemental composition of the film surface by the spectrometer. The conclusion is that, when we use ethanol as the solvent of the ion exchange, the metal ions can access the surface of the polyimide film easily. We also explored the effect of the metal ion radius and valence on the access into polyimide film surface.2. We used finished polyimide film through alkaline etching, ion exchange and heat treatment to obtain polyimide composite films with lead sulfide compound, and then identified the composition of crystalline inorganic layer of the surface of the polyimide film by X-ray diffraction. Through the peaks of the X-ray diffraction patterns we found out a more appropriate concentration of the solution using in ion exchange, determined the surface morphology of the inorganic layer of the film by scanning electron microscopy, explored the impact of the heat treatment temperature and heat treatment time on the surface morphology of the inorganic layer of the composite films and for the electrical and mechanical properties of the polyimide/PbS composite films, and explained the mechanism.