Monodisperse near infrared silver telluride quantum dots and preparation method thereof
A quantum dot and near-infrared technology, applied in the field of material science, can solve the problems of poor stability of quantum dots, no near-infrared fluorescence emission, etc., and achieve the effects of mild and controllable reaction conditions, suitable for large-scale industrial production, and simple operation.
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Embodiment 1
[0040] Example 1 Take 0.1mmol of tellurium powder and 0.3mmol of sodium borohydride and add them to 3mL of water, cut off the air and react for 30 minutes to obtain a clear and transparent aqueous solution of sodium telluride hydride; take 0.4mmol of silver nitrate and dissolve it in 35mL of oleylamine, and dissolve the sodium telluride hydride Add the aqueous solution into the silver nitrate solution, stir for 5 minutes, then add 5 mmol of 1-dodecanethiol, continue stirring for 10 minutes, transfer the above solution to a 50mL reactor, and conduct a hydrothermal reaction at 180°C for 0.5 hours. After the reaction is completed, naturally cool to At room temperature, the upper organic phase was washed with a large amount of ethanol, and the surface ligand was exchanged with mercaptopropionic acid to obtain Ag evenly dispersed in water. 2 Te quantum dots.
[0041] from figure 1 It can be seen from the transmission electron microscope photos that the near-infrared silver telluri...
Embodiment 2
[0042] Example 2 Take 0.1mmol of tellurium powder and 0.3mmol of sodium borohydride and add them to 2mL of water, cut off the air and react for 20 minutes to obtain a clear and transparent sodium telluride hydride solution; take 0.4mmol of silver acetate and dissolve it in 30mL of toluene, and dissolve the sodium telluride hydride solution Add silver nitrate solution, stir for 5 minutes, then add 5mmol tri-n-octyl phosphine, continue stirring for 10 minutes, transfer the above solution to a 50mL reaction kettle, and conduct a hydrothermal reaction at 200°C for 2 hours. After the reaction is completed, naturally cool to room temperature. After the upper organic phase was washed with a large amount of ethanol, the surface ligand was exchanged with mercaptopropionic acid to obtain Ag evenly dispersed in water. 2 Te quantum dots.
Embodiment 3
[0043] Example 3 Take 0.1mmol of tellurium powder and 0.3mmol of sodium borohydride and add them to 1mL of water, and react with the air for 10 minutes to obtain a clear and transparent sodium tellurium hydride aqueous solution; take 0.4mmol of silver lactate and dissolve it in 30mL of oleic acid, and dissolve the sodium tellurium hydride Add the aqueous solution to the silver nitrate solution, stir for 5 minutes, then add 5 mmol of cetyltrimethylammonium bromide, continue stirring for 10 minutes, transfer the above solution to a 50mL reactor, and conduct a hydrothermal reaction at 120°C for 24 hours, and the reaction is complete After natural cooling to room temperature, the upper organic phase was washed with a large amount of ethanol, and the surface ligand was exchanged with mercaptopropionic acid to obtain Ag evenly dispersed in water. 2 Te quantum dots.
[0044] In summary, the present invention prepares near-infrared silver telluride quantum dots by reacting at the two-...
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