Preparation method of Cs4PbBr6 perovskite nanocrystal with size and shape controllable
A perovskite and nanocrystal technology, applied in the field of preparation of Cs4PbBr6 perovskite nanocrystals, can solve the problems of less research on type perovskite nanocrystals, limited understanding of type perovskite nanocrystals, and backward controllable preparation. To achieve the effect of controllable morphology, easy adjustment of product size and simple operation
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Embodiment 1
[0024] First, a cesium oleate solution is prepared. Take 2mmol (0.648g) of cesium carbonate powder, 10mmol (3.35mL) of OA (oleic acid) and 6.65mL of ODE (octadecene) and mix them, heat to 150°C under nitrogen protection to dissolve cesium carbonate, cool to 100 ℃, prepared into 0.2M cesium oleate solution, which was light yellow transparent solution.
[0025] Then take 0.2mmol of lead bromide solid powder, 0.5mL of oleylamine, 0.5mL of oleic acid and 3mL of octadecene into a three-necked flask, vacuumize at 50°C for 30 minutes, fill with nitrogen protection, and then heat up to 150°C. After the lead bromide is dissolved, cool down to room temperature 25°C, then inject 0.2mL of 0.2M cesium oleate octadecene solution, and react for 30 minutes to obtain 0.04mmol of CsPbBr with an absorption peak at 402nm 3 Nanoclusters, whose absorption spectrum is shown in figure 1 , the resulting product was purified by centrifugation at 10,000 r / min for 5 minutes, and then dispersed into 1 m...
Embodiment 2
[0027] Dilute 0.3 mL of 0.2 M cesium oleate octadecene solution with 4 mL of octadecene, heat to 100 ° C, and then 1 mL of CsPbBr prepared in Example 1 3 The octadecene dispersion of nanoclusters was injected into the above-mentioned cesium oleate solution at 100°C, and reacted for 1 minute to obtain Cs with a size of 9.8nm 4 PbBr 6 Nanoparticles, whose electron micrographs are shown in figure 2 , the whole process does not need the protection of nitrogen conditions.
Embodiment 3
[0029] Dilute 0.3 mL of 0.2 M cesium oleate octadecene solution with 4 mL of octadecene, heat to 150 ° C, and then 1 mL of CsPbBr prepared in Example 1 3 The octadecene dispersion of nanoclusters was injected into the cesium oleate solution at 150°C, and reacted for 1 minute to obtain Cs with a size of 16 nm. 4 PbBr 6 Nanoparticles, whose electron micrographs are shown in image 3 , the whole process does not need the protection of nitrogen conditions.
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