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Method for preparing CsPbBr3 nanosheets with quantum size effects

A technology of size effect and nanosheets, which is applied in the field of preparation of CsPbBr3 nanosheets, can solve problems such as the inability to control the lateral size of nanosheets

Inactive Publication Date: 2017-06-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reported synthesis of CsPbBr using an amine ligand 3 The nanosheet method (Adv.Mater.2016, 28, 4861–4869), a one-step reaction, cannot regulate the lateral size of the nanosheet

Method used

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  • Method for preparing CsPbBr3 nanosheets with quantum size effects
  • Method for preparing CsPbBr3 nanosheets with quantum size effects
  • Method for preparing CsPbBr3 nanosheets with quantum size effects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Add 0.05g of cesium carbonate powder to a 50mL three-necked flask containing 5mL of oleic acid, stir and react for 0.5h at 120°C, the cesium carbonate powder is completely dissolved, and the cesium oleate precursor is obtained; in the process, pass in Argon removes the water produced by the reaction;

[0030] 2) Add 0.04g of lead bromide, 0.25mL oleic acid, 0.25mL oleylamine, 0.15mL octanoic acid and 0.15mL octylamine to 10mL octadecene in sequence, and stir the reaction at 120℃ for 0.5h to lead bromide powder Completely dissolve to obtain a mixed solution; In this process, argon gas is introduced, and the reaction system is always kept in an inert atmosphere;

[0031] 3) After the temperature of the mixed solution in step 2) rises to 120°C, quickly inject 1 mL of the cesium oleate precursor cooled to room temperature, and after reacting for 15 seconds, transfer to a 100°C oil bath to continue the reaction. The total reaction time is 5min (total reaction time includes 15...

Embodiment 2

[0035] 1) Add 0.05g of cesium carbonate powder to a 50mL three-necked flask containing 5mL of oleic acid, stir and react for 0.5h at 120°C, the cesium carbonate powder is completely dissolved, and the cesium oleate precursor is obtained; in the process, pass in Argon removes the water produced by the reaction;

[0036] 2) Add 0.04g of lead bromide, 0.25mL oleic acid, 0.25mL oleylamine, 0.25mL octanoic acid and 0.25mL octylamine to 10mL octadecene solvent, and stir the reaction at 120℃ for 0.5h to lead bromide The powder is completely dissolved to obtain a mixed solution; argon gas is introduced during this process, and the reaction system is always kept in an inert atmosphere;

[0037] 3) After the temperature of the mixed solution in step 2) rises to 130°C, quickly inject 1 mL of the cesium oleate precursor cooled to room temperature, and transfer to an oil bath at 110°C for 15 seconds to continue the reaction. The total reaction time is 5min (total reaction time includes 15s aft...

Embodiment 3

[0041] 1) Add 0.05g of cesium carbonate powder to a 50mL three-necked flask containing 5mL of oleic acid, stir and react for 0.5h at 120°C, the cesium carbonate powder is completely dissolved, and the cesium oleate precursor is obtained; in the process, pass in Argon removes the water produced by the reaction;

[0042] 2) Add 0.04g of lead bromide, 0.25mL of oleic acid, 0.25mL of oleylamine, 0.35mL of octanoic acid and 0.35mL of octylamine to 10mL of octadecene solvent, and stir the reaction at 120℃ for 0.5h to lead bromide The powder is completely dissolved and a mixed solution is obtained; argon gas is introduced during this process, and the reaction system is always kept in an inert atmosphere;

[0043] 3) After the temperature of the mixed solution in step 2) is increased to 140°C, quickly inject 1 mL of the cesium oleate precursor cooled to room temperature, and after reacting for 10 seconds, transfer to an oil bath at 120°C to continue the reaction. The total reaction time is...

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Abstract

The invention discloses a method for preparing CsPbBr3 nanosheets with quantum size effects. The method includes dissolving cesium carbonate in oleic acid under argon filling conditions, and stirring the cesium carbonate and the oleic acid under heating conditions until the cesium carbonate is dissolved to obtain cesium oleate precursors; adding lead bromide, long-chain ligands and short-chain ligands into octadecene under argon filling conditions, carrying out reaction at the temperature of 100-150 DEG C until the lead bromide is dissolved, heating first reaction products until the temperature of the first reaction products reaches 120-150 DEG C, then injecting the cesium oleate precursors into the first reaction products, carrying out reaction for 5-15 s, then continuing to carry out reaction at the temperature of 100-130 DEG C for 1-5 min to obtain second reaction products and centrifuging the second reaction products. The method has the advantages that the transverse sizes of the CsPbBr3 nanosheets can be assuredly regulated and controlled in the range from 100 nm to 1 micrometer while the thicknesses which are equal to the thicknesses of a few atomic layers can be guaranteed; the thicknesses which are lower than the diameters of Bohr excitons can be kept, and accordingly the quantum size effects of the CsPbBr3 nanosheets can be reserved.

Description

Technical field [0001] The invention belongs to the field of nano material preparation, and specifically relates to a CsPbBr with quantum size effect 3 Preparation method of nanosheets. Background technique [0002] In recent years, with the rapid development of organic-inorganic hybrid perovskite solar cells, its photoelectric conversion efficiency has rapidly increased from 3.8% in 2009 to 22.1% in 2016. This is due to the strong light-absorbing ability of perovskite materials. The carrier mobility and long exciton migration distance also indicate that the material still has great development potential. In addition, CH 3 NH 3 PbX 3 (X = Br, I, Cl) quantum dots exhibit excellent photoluminescence properties, and the light can cover the entire visible spectrum, and the quantum yield can reach 70% (Acs Nano, 2015, 9(4): 4533-4542; Nano letters,2015,15(6):3692-3696.). But CH 3 NH 3 The stability in the air is very poor and needs to be processed in an inert atmosphere, which limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G21/006C01P2004/61C01P2004/62C01P2004/64C01P2004/04
Inventor 杨智汪敏强
Owner XI AN JIAOTONG UNIV
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