Preparation method for multi-shell CdZnS/CdSe/ZnS core/shell-structured quantum dot
A quantum dot and shell structure technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as being susceptible to water, oxygen erosion and photodegradation, and not being passivated at the same time.
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[0020] 1. Preparation method of CdZnS / CdSe / ZnS quantum dots:
[0021] (1) Synthesis of CdZnS core material. Using cadmium oxide CdO and anhydrous zinc acetate Zn(Ac) 2 As a raw material, anhydrous zinc acetate Zn(Ac) 2 excess. 0.5mmol CdO and 5mmol Zn(Ac) 2 Add to a 50ml three-necked flask, then add 6ml oleic acid OA and 10mL octadecene, when the temperature reaches 100°C, blow in an inert gas for 15 minutes to remove the air, then heat up to 315°C under an inert gas environment, when the temperature reaches 305°C Inject 1mmol of S source (high-purity sulfur dissolved in octadecene) at ℃. After the reagent is injected, take a sample at intervals to measure the absorption spectrum. When the absorption spectrum of two consecutive samples does not change, the heat preservation is over and cooled. At 60°C, the CdZnS core material is formed, and the stock solution appears purple under ultraviolet light.
[0022] (2) Purification of CdZnS nuclear quantum dots. First, add an ap...
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