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CN-121978783-A - Preparation method of one-dimensional cesium lead bromine nanowire film, film material, element and equipment

CN121978783ACN 121978783 ACN121978783 ACN 121978783ACN-121978783-A

Abstract

The invention discloses a preparation method, a film material, an element and equipment of a one-dimensional cesium lead bromine nanowire film, wherein the preparation method comprises the steps of preparing a first solution comprising proper amount of acetone, toluene and a surfactant; weighing lead bromide and cesium bromide in a molar ratio of 1:1, grinding the lead bromide and the cesium bromide into uniform powder, adding the powder into a first solution in a constant-temperature water bath, stirring the mixture for reaction, separating and washing the mixture to obtain pure cesium lead bromine nanowires, dispersing the cesium lead bromine nanowires in a mixed solvent of n-octane and n-hexane to obtain nanowire dispersion liquid required by preparing a film, coating the nanowire dispersion liquid on a substrate, and drying the substrate at room temperature to obtain the uniform one-dimensional cesium lead bromine nanowire film with high polarized luminescence and polarization response. The preparation process of the one-dimensional cesium-lead-bromine nanowire film is optimized, and the preparation of the macroscopic orientation cesium-lead-bromine nanowire film with high polarization luminescence and polarization response is realized, so that the preparation of an optical device with good anisotropy and polarization performance is realized.

Inventors

  • LU WEI
  • WANG PEIXI

Assignees

  • 中国科学院苏州纳米技术与纳米仿生研究所

Dates

Publication Date
20260505
Application Date
20260122

Claims (10)

  1. 1. The preparation method of the one-dimensional cesium lead bromine nanowire film comprises the following steps of Preparing a first solution containing proper amounts of acetone, toluene and surfactant, weighing lead bromide and cesium bromide in a molar ratio of 1:1, and grinding the lead bromide and the cesium bromide into uniform powder; Separating and washing after the reaction is finished to obtain pure cesium lead bromine nanowires; dispersing cesium lead bromine nanowires in a mixed solvent of n-octane and n-hexane to obtain nanowire dispersion liquid required by preparing a film; And coating the nanowire dispersion liquid on a substrate, and drying at room temperature to obtain the uniform one-dimensional cesium lead bromine nanowire film with high polarized luminescence and polarization response.
  2. 2. The method for preparing a one-dimensional cesium lead bromine nanowire film according to claim 1, wherein the concentration of the nanowire dispersion liquid is 0.05-0.2g/mL.
  3. 3. The method for preparing the one-dimensional cesium lead bromine nanowire film according to claim 1, wherein the volume ratio of n-octane to n-hexane in the mixed solvent is (0.66-6): 1.
  4. 4. The method for preparing a one-dimensional cesium lead bromine nanowire film according to claim 1, wherein a coating thickness of the nanowire dispersion liquid on a substrate is 50-500 μm.
  5. 5. The method for preparing the one-dimensional cesium lead bromine nanowire film according to claim 1, wherein the surfactant in the first solution is selected from oleic acid and oleylamine.
  6. 6. The method for preparing a one-dimensional cesium lead bromine nanowire film according to claim 5, wherein the surfactant in the first solution comprises oleic acid and oleylamine in a volume ratio of (1-2): 1.
  7. 7. The method for preparing the one-dimensional cesium lead bromine nanowire film according to claim 1, 5 or 6, wherein the composition of the first solution comprises 0-200mL of acetone, 0-200mL of toluene, 10-20mL of oleic acid and 10-20mL of oleylamine.
  8. 8. A film material prepared by the preparation method of the one-dimensional cesium lead bromine nanowire film according to any one of claims 1 to 7.
  9. 9. An optical element prepared from the film material of claim 8, the optical fiber element having anisotropic and polarizing properties.
  10. 10. Optical device comprising an optical element according to claim 9.

Description

Preparation method of one-dimensional cesium lead bromine nanowire film, film material, element and equipment Technical Field The invention belongs to the technical field of semiconductors, and particularly relates to a preparation method, a film material, an element and equipment of a one-dimensional cesium lead bromine nanowire film. Background The cesium lead bromine perovskite material is a semiconductor material with excellent photoelectric performance and great application potential, has the advantages of high light absorption coefficient and the like, and can be applied to solar cells, light-emitting diodes, photoelectric detectors, sensors and the like. Compared with bulk materials, the nano-materials show the characteristic properties of nano-materials, such as surface and interface effects, small-size effects and the like, due to the reduction of the particle size to the nano-scale. The nanocrystals have gradually achieved morphology and size control. Compared with three-dimensional, two-dimensional and zero-dimensional cesium lead bromine nano materials, the one-dimensional cesium lead bromine nano materials have excellent intrinsic linear polarization luminescence performance due to the one-dimensional structure and the excellent length-diameter ratio. However, the preparation method has a plurality of limitations, and is difficult to prepare the nanowires with good length-diameter ratio on a large scale. The preparation of high-performance perovskite nanowire arrays by an anodic aluminum oxide template method has been reported in the aspect of nanowire films, however, few researches on achieving uniform orientation and excellent uniformity of perovskite nanowire films by using a traditional film forming process have been reported. Therefore, in order to solve the above technical problems, it is necessary to provide a preparation method, a film material, an element and equipment of a one-dimensional cesium lead bromine nanowire film. Disclosure of Invention The invention aims to provide a preparation method, a film material, an element and equipment of a one-dimensional cesium lead bromine nanowire film. In order to achieve the above object, a specific embodiment of the present invention provides the following technical solution: A preparation method of a one-dimensional cesium-lead-bromine nanowire film comprises the steps of preparing a first solution comprising proper amounts of acetone, toluene and a surfactant, weighing lead bromide and cesium bromide in a molar ratio of 1:1, grinding the lead bromide and the cesium bromide into uniform powder, adding the powder into the first solution in a constant-temperature water bath, stirring the powder for reaction, separating and washing the powder after the reaction is finished to obtain pure cesium-lead-bromine nanowire, dispersing the cesium-lead-bromine nanowire in a mixed solvent of n-octane and n-hexane to obtain nanowire dispersion liquid required by preparing the film, coating the nanowire dispersion liquid on a substrate, and drying the nanowire dispersion liquid at room temperature to obtain the uniform one-dimensional cesium-lead-bromine nanowire film with high polarization luminescence and polarization response. In the scheme, lead bromide and cesium bromide are mixed according to the equimolar ratio, so that cesium ions and lead ions are fully combined in the reaction process, the defect of product purity reduction or structural defect caused by unbalanced raw material proportion is avoided, the contact area of raw materials can be increased by grinding treatment, the reaction rate is accelerated, and the reaction uniformity is ensured. In one or more embodiments of the invention, the concentration of the nanowire dispersion is 0.05-0.2g/mL. In one or more embodiments of the invention, the volume ratio of n-octane to n-hexane in the mixed solvent is (0.66-6): 1. In one or more embodiments of the invention, the nanowire dispersion is coated on the substrate to a thickness of 50-500 μm. In one or more embodiments of the invention, the surfactant in the first solution is selected from oleic acid, oleylamine. In one or more embodiments of the invention, the surfactant in the first solution comprises oleic acid, oleylamine in a volume ratio of (1-2): 1. In one or more embodiments of the invention, the composition of the first solution includes 0-200mL acetone, 0-200mL toluene, 10-20mL oleic acid, 10-20mL oleylamine. According to the scheme, the solvent and the surfactant are synergistic, so that the reactant can be fully dissolved, the growth direction of the nanowire can be regulated and controlled through the coordination of the surfactant, the particle aggregation is inhibited, and a foundation is laid for preparing the nanowire with excellent length-diameter ratio. In one or more embodiments of the invention, the composition of the first solution includes 160mL acetone, 40mL toluene, 20mL oleic acid, 10mL oleylamine. The solvent and the