The invention belongs to the technical field of
material chemistry, and relates to a method for preparing an Ag2X film, wherein X refers to
selenium or
tellurium. The method provided by the invention comprises the following steps: firstly, adding silver nitrates and a compound of
selenium or
tellurium into a
beaker filled with a
solvent, then adding alkali and a complexing agent into the
beaker, and fully stirring so as to completely dissolve the added objects, then adding a
reducing agent into the
beaker, after the
reducing agent is completely dissolved, stopping stirring, and adding a substrate into the beaker for depositing the Ag2X film; then, after the thermostatic reaction is completed, washing the obtained Ag2X film with deionized water and absolute ethyl
alcohol; and finally,
drying the Ag2X film. The method provided by the invention has the advantages that the reaction condition is mild, an Ag2Se or Ag2Te film can be synthesized at one step in an
aqueous solution, and the prepared film is smooth, compact and uniform; the used raw materials are cheap and easy to obtain, the process is simple, the large-scale production is easy to realize, and because of avoiding using a large quantity of organic solvents in the process of reaction, the method is in favor of
environmental protection, and has a broad market prospect; and the synthesized silver
selenide and
silver telluride film can be widely applied to multiple fields of fast ionic conductors,
nonlinear optical elements, photoelectric secondary batteries, and the like, therefore, the film has a broad market prospect.