Method for preparing organic-phase silver selenide quantum dots with controllable sizes

Abstract

The invention discloses a method for preparing size-controllable organic-phase silver selenide quantum dots. The method comprises the following steps: mixing a silver source, a solvent and a surface ligand at room temperature under stirring conditions, and introducing protective gas to obtain a silver precursor; and mixing selenium powder and fatty amine at room temperature under ultrasonic conditions to obtain a selenium precursor; and heating the silver precursor to 120-180 DEG C, adding a selenium precursor, carrying out a reaction at 100-150 DEG C for a period of time, then performing cooling to room temperature, and carrying out separating and purifying to obtain the Ag2Se quantum dots. Compared with conventional Ag2Se quantum dot synthesis methods, the Ag2Se quantum dot preparation method provided by the invention mainly has the following two advantages: 1, the selenium precursor is simple to prepare, and is prepared by only subjecting selenium powder and fatty amine to ultrasonic treatment at room temperature; and 2, the size adjustable range is wide, and the fluorescence emission peak of the Ag2Se quantum dots can be adjusted within the range of 955 nm to 1612 nm. The Ag2Sequantum dots prepared by the method are good in monodispersity; the wavelength of the Ag2Se quantum dots is adjustable in a near-infrared region; and the Ag2Se quantum dots have application potentialin the fields of biomedicine, material science and the like.

Description

technical field

[0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing size-controllable organic phase silver selenide quantum dots. Background technique

[0002] Living tissues and organs have lower autofluorescence and better penetration depth in the near-infrared long wavelength range (NIR-IIb, 1500nm-1700nm). Therefore, fluorescent materials with emission wavelengths in this range have good application potential in the field of in vivo imaging. Quantum dots are ideal fluorescent materials due to their excellent optical properties. However, at present, the quantum dots whose wavelength can be adjusted to the NIR-IIb region are mainly lead-containing quantum dots, and the potential toxicity of lead greatly limits the application prospects of lead-containing quantum dots in the field of biological imaging. Therefore, the development of new lead-free near-infrared quantum dots Quantum dots became...

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