A kind of synthesis method of acid-assisted preparation of cdse/cds/zns core-shell structure quantum dots
A core-shell structure and synthesis method technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of unfavorable quantum dot emission wavelength, large environmental pollution, red shift of quantum dot emission wavelength, etc. The effect of simple coating method and few kinds of raw materials
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Embodiment 1
[0027] The quantum dots with core-shell structure synthesized in this example use cadmium selenide as the core nanocrystal, and the core quantum dot solution is epitaxially grown in an organic system with the aid of an organic acid to obtain inorganic shells of cadmium sulfide and zinc sulfide. The size of the obtained core-shell structure quantum dot is 4-6 nm, and the emission peak is 540 nm.
[0028] The core CdSe nanocrystals were prepared in the paraffin-oleic acid system by a general method, which is briefly described as follows:
[0029] 1. Preparation of Precursors
[0030] a) Add CdO (0.256g), oleic acid (2ml), and liquid paraffin (8ml) into a reaction vessel, heat to 180°C while stirring until the cadmium oxide dissolves into a golden yellow liquid, cool to room temperature, and use as CdSe Precursors of Cd in the core and CdS shell;
[0031] b) Mix and heat sulfur powder (0.064g) and liquid paraffin (10ml) to 120°C to obtain a clear and transparent solution, which...
Embodiment 2
[0043] The quantum dots with core-shell structure synthesized in this example use cadmium selenide as the core nanocrystal, and the core quantum dot solution is epitaxially grown in an organic system with the aid of an organic acid to obtain inorganic shells of cadmium sulfide and zinc sulfide. The size of the obtained core-shell structure quantum dot is 4-6 nm, and the emission peak is 576 nm. In this embodiment, an inert atmosphere is used for protection.
[0044] The core CdSe nanocrystals were prepared in the paraffin-oleic acid system by a general method, which is briefly described as follows:
[0045] 1. Preparation of Precursors
[0046] a) Add CdO (0.256g), oleic acid (2ml) and liquid paraffin (8ml) into the reaction vessel, slowly pass nitrogen gas while stirring, heat to 180°C until the cadmium oxide dissolves into a golden yellow liquid, cool to Room temperature, as the precursor of Cd in CdSe core and CdS shell;
[0047] b) Mix and heat sulfur powder (0.064g) an...
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