Method for preparing palladium and/or antimony-doping tin oxide nano-powder

Abstract

The invention discloses a method for preparing palladium and / or antimony-doping tin oxide nano-powder. The method mainly comprises the following steps of: mixing raw materials according to the molar doping ratio of Pd<2+> and / or Sb<3+> to Sn<2+> of 0.5 to 3.5 and dropwise adding at least one of the solution of PdCl2 and the suspension of SbCl3 into the solution of tin salt with stirring to form mixed solution, wherein the raw materials comprise 0.2 to 1 mol / L solution of tin salt, 0.1 to 0.5 mol / L solution of palladium chloride (PbCl2), 0.1 to 0.5 mol / L suspension of antimony chloride (SbCl3)and 0.4 to 1 mol / L solution of alkali source; adding the solution of alkali source dropwise into the mixed solution with stirring until the pH value is between 9 and 13; stirring the solution to formprecursor suspension with a large amount of precipitate; transferring the precursor suspension to a high-pressure reactor to perform reaction for 12 to 36 hours at the temperature of between 100 and 200 DEG C and naturally cooling to room temperature to obtain a hydrothermal product; washing the hydrothermal product for multiple times by using deionized water and ethanol and detecting the productby using silver nitrate until the Cl<-> is removed completely; and drying at the temperature of between 70 and 100 DEG C to obtain the palladium and / or antimony-doping tin oxide nano-powder. The method has the advantages of simple process, environmental friendliness and suitability for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of tin oxide nano powder, in particular to a preparation method of palladium and / or antimony doped tin oxide nano powder. Background technique [0002] SnO 2 With excellent photoelectric characteristics and sensitivity to reducing gases, it has been widely used in the fields of gas sensor materials, transparent conductive powders and photocatalytic materials. When SnO 2 After the grain size of the material enters the nanoscale, it shows many special physical and chemical properties due to the unique small size effect, quantum size effect and surface effect of nanomaterials, so that SnO 2 Nanoparticles have shown great advantages in applications such as gas sensing, transparent conduction, and photocatalysis. But due to SnO 2 Nanoparticles have a high specific surface energy and belong to a thermodynamically unstable system. In order to achieve a stable state, the particles will spontaneously agglomerate...

AI Technical Summary

Problems solved by technology

[0005] 1) After the precursor is obtained by the co-precipitation method, the final product must be calcined. During the calcining process, impurities are easily introduced, resulting in the agglomeration of nano-powders and the segregation of doping elements, resulting in uneven doping and affecting Final properties of the powder

[0006] 2), using a large amount of concentrated hydrochloric acid, concentrated sulfuric acid, concentrated nitric acid or ammonia water as an acid-base regulator or precipitant, transportation, storage and use are inconvenient and unsafe, and lead to a harsh production environment

[0007] 3), adding inorganic stabilizers such as tartaric acid or cetyltrimethylammonium bromide, the cost is greatly increased, and at the same time when a large amount of stabilizers are removed at high temperature, the exhaust gas produced will pollute the environment, which is not conducive to long-term large-scale mass production

Images