Hiberarchy bismuth telluride nanocrystal and preparation method thereof
A hierarchical structure, nanocrystalline technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, to achieve the effect of controllable morphology
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Embodiment 1
[0026] The preparation of the trioctylphosphine solution of embodiment 1 tellurium
[0027] Prepare a trioctylphosphine solution of tellurium with a concentration of 0.2mol / L. The specific operation process is as follows: mix tellurium powder and trioctylphosphine into a 50mL round-bottomed three-necked bottle, and raise the temperature to 200°C under the protection of nitrogen for 4 hours. After a few hours, it will naturally come to room temperature and be stored for later use.
[0028] It is also possible to raise the temperature to 250° C. under the protection of nitrogen and keep it for 2 hours, then cool down to room temperature naturally to prepare a trioctylphosphine solution of tellurium with a concentration of 0.2 mol / L.
Embodiment 2
[0029] Example 2 The hierarchical structure Bi prepared after the reaction temperature was kept at 140°C for 2 hours 2 Te 3 Nanocrystalline
[0030] First, put 0.2mmol of bismuth acetate, 1mL of oleic acid and 6mL of octadecene into a 50mL round-bottomed three-neck flask, and with strong magnetic stirring, the temperature was gradually raised under the protection of nitrogen until the bismuth acetate was completely dissolved. Then gradually lower to room temperature. Add 1.5 mL of the previously prepared 0.2 mol / L tellurium trioctylphosphine solution into the three-necked flask at room temperature, then raise the temperature to 140° C. and keep it for 2 hours. figure 1 For the X-ray diffraction pattern of the prepared sample, it is the Bi of the trigonal crystal system 2 Te 3 . like figure 2 As shown, it can be seen from the scanning electron micrographs of the prepared samples that the hierarchical structure Bi 2 Te 3 The nanocrystal diameter is 230nm.
Embodiment 3
[0031] Example 3 The hierarchical structure Bi prepared after the reaction temperature was kept at 160°C for 2 hours 2 Te 3 Nanocrystalline
[0032] First, put 0.2mmol of bismuth acetate, 1mL of oleic acid and 6mL of octadecene into a 50mL round-bottomed three-neck flask, and with strong magnetic stirring, the temperature was gradually raised under the protection of nitrogen until the bismuth acetate was completely dissolved. Then gradually lower to room temperature. Add 1.5 mL of the previously prepared 0.2 mol / L tellurium trioctylphosphine solution into the three-necked flask at room temperature, then raise the temperature to 160° C. and keep it for 2 hours. like image 3 As shown, it can be seen from the scanning electron micrographs of the prepared samples that the hierarchical structure Bi 2 Te 3 The nanocrystal diameter is 345nm.
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