A method for preparing size-controllable organic phase silver selenide quantum dots

An organic phase and quantum dot technology, which is applied in the field of preparing size-controllable organic phase silver selenide quantum dots, can solve the problems of narrow quantum dot size control range, uncontrollable fluorescence emission peak, complicated preparation of selenium precursor, etc. Low price of raw materials, beneficial to industrial production and promotion, low price effect
CN110734767BActive Publication Date: 2022-04-22WUHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN UNIV
Publication Date
2022-04-22

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Abstract

The invention discloses a method for preparing size-controllable organic phase silver selenide quantum dots, which comprises the following steps: mixing a silver source, a solvent and a surface ligand at room temperature under stirring conditions, and introducing a protective gas to obtain a silver precursor Mix selenium powder and oleylamine at room temperature and under ultrasonic conditions to obtain a selenium precursor; raise the temperature of the above silver precursor to 120-180°C, add the selenium precursor, and react at 100-150°C for a period of time, then drop to room temperature, Ag was obtained through separation and purification 2 Se quantum dots. with existing Ag 2 Compared with Se quantum dot synthesis method, the Ag provided by the invention 2 The synthesis method of Se quantum dots mainly has the following two advantages: first, the preparation of the selenium precursor is simple, and only need to ultrasonicate the selenium powder and oleylamine at room temperature; 2 The fluorescence emission peak of Se quantum dots is adjustable in the range of 955nm to 1612nm. Ag prepared by the present invention 2 Se quantum dots have good monodispersity and tunable wavelength in the near-infrared region, and have potential applications in the fields of biomedicine and material science.
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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...

Claims

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