Method for preparing single-layer molybdenum disulfide nanosheet

The invention discloses a method for preparing a single-layer molybdenum disulfide nanosheet, which mainly comprises the following steps: preparing a mixed solution of an organic solvent and ammonium molybdate, pretreating the mixed solution of the organic solvent and the ammonium molybdate by adopting a double-temperature-zone chemical vapor deposition system so as to separate out ammonium molybdate and uniformly distribute the ammonium molybdate on the surface of a substrate, and after the pretreatment is finished, drying to obtain the single-layer molybdenum disulfide nanosheet. And preparing the single-layer molybdenum disulfide nanosheet on the surface of the substrate by adopting a chemical vapor deposition process. Due to the addition of the organic solvent, the solution can be more easily and uniformly distributed on the surface of the substrate. The method can be suitable for directly growing the single-layer molybdenum disulfide nanosheets on different substrates, meets the requirements of different