CsPbX3@TiO2 nanomaterial as well as preparation method and application thereof

A nano-material and reaction technology, applied in the field of CsPbX3@TiO2 nano-materials, can solve the problems of poor water stability, limitation, and complicated traditional methods, and achieve the effect of uniform coating, simple operation, and obvious structure

Inactive Publication Date: 2019-05-17
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The traditional method for the preparation of all-inorganic perovskite nanocrystals is relatively complicated, has poor water stability, and the photocatalytic material TiO 2 The application is limited to problems such as the absorption of ultraviolet light, and the primary purpose of the present invention is to provide a kind of CsPbX 3 @TiO 2 nanomaterials

Method used

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  • CsPbX3@TiO2 nanomaterial as well as preparation method and application thereof
  • CsPbX3@TiO2 nanomaterial as well as preparation method and application thereof
  • CsPbX3@TiO2 nanomaterial as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) CsPbBr 3 Preparation of precursor solution: Weigh cesium bromide:lead bromide molar mass ratio of 0.5mmol:0.5mmol, in a 25mL three-necked flask, add a mixture of oleic acid:oleylamine volume ratio of 0.5mL:0.5mL, then, Add 10mL N,N-dimethylformamide (DMF), heat to 100°C under the protection of argon, and react for 3 hours to obtain CsPbBr with clear color 3 Precursor solution;

[0050] (2) CsPbBr 3 @TiO x Preparation: take 0.3mL of CsPbBr prepared in step (1) 3 Precursor solution, at a speed of 1200rpm, quickly add it to 10mL of n-hexane that has been dried after dehydration, and after stirring for 15 minutes, add 1mL of a n-hexane solution of tetrabutyl titanate with a concentration of 20mg / mL dropwise, and after 30s, turn to Adjusted back to 150rpm, by sol-gel method in CsPbBr 3 Surface hydrolysis coated TiO x , continue to stir the reaction for 2 hours, and centrifuge at 5000rpm for 10 minutes to obtain CsPbBr 3 @TiO x precipitation;

[0051] (3) CsPbBr ...

Embodiment 2

[0053] (1) CsPbCl 3 Preparation of precursor solution: Weigh cesium chloride: lead chloride molar mass ratio of 1mmol: 1mmol, in a 25mL three-necked flask, add a mixture of oleic acid: oleylamine volume ratio of 1.0mL: 0.5mL, and then add 10mL N,N-Dimethylformamide (DMF), heated to 100°C under the protection of argon, and reacted for 3 hours to obtain CsPbCl with clear color 3 Precursor solution;

[0054] (2) CsPbCl 3 @TiO x Preparation: Take 0.5mL of the precursor solution prepared in step (1), and quickly add it to 10mL of n-hexane that has been dehydrated and dried at a rotating speed of 1200rpm. After stirring for 30 minutes, add dropwise 1mL of 40mg / mL Titanium tetrachloride / n-hexane solution, the rotation speed was adjusted back to 150rpm after 30s, and the CsPbCl 3 Surface hydrolysis coated TiO x , continue to stir the reaction for 3 hours, and centrifuge at 5000rpm for 20 minutes to obtain CsPbCl 3 @TiO x precipitation;

[0055] (3) CsPbCl 3 @TiO 2 The prepar...

Embodiment 3

[0057] (1) CsPbI 3 Preparation of precursor solution: Weigh cesium iodide: lead iodide molar mass ratio of 1mmol: 1mmol, in a 25mL three-necked flask, add a mixture of oleic acid: oleylamine volume ratio of 0.5mL: 1mL, then add 10mLN, N-dimethylformamide (DMF), heated to 120°C under the protection of argon, and reacted for 2 hours, the clear color CsPbI can be obtained 3 Precursor solution;

[0058] (2) CsPbI 3 @TiO x Preparation: Take 0.4mL of the precursor solution prepared in step (1), quickly add it into 10mL of toluene that has been dehydrated and dried at a rotational speed of 1200rpm, stir for 30 minutes, and then add 1mL of titanium with a concentration of 50mg / mL dropwise. Acetyl tetrabutyl ester / toluene solution, after 30s, the rotation speed was adjusted back to 150rpm, and the CsPbI 3 Surface hydrolysis coated TiO x , continue to stir the reaction for 3 hours, and centrifuge at 5000rpm for 10 minutes to obtain CsPbI 3 @TiO x precipitation;

[0059] (3) CsPb...

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Abstract

The invention discloses a CsPbX3@TiO2 nanomaterial as well as a preparation method and application thereof. The preparation method comprises the following steps: first, dissolving CsX and PbX2 in a surfactant and an N,N-dimethylformamide solution system, and heating to form a CsPbX3 precursor solution; then hydrolyzing and coating TiOx onto the surface of CsPbX3 in a titanate solution through a sol-gel method to obtain CsPbX3@TiOx; calcining under the protection of argon to obtain the CsPbX3@TiO2 nanomaterial. The CsPbX3@TiO2 nanometer material with an obvious structure and uniform coating isprepared with a 'one pot method', and has high fluorescence stability. The material powder can be placed stably at room temperature for two months or more, keeps ultrasonically stable in an aqueous solution for 60 minutes or more, and can be widely applied in various fields such as solar cells, photocatalysis, display devices, lasers, light detection devices and biological fluorescence labels.

Description

technical field [0001] The invention relates to the technical field of nanomaterial synthesis, in particular to a CsPbX 3 @TiO 2 Nanomaterials and their preparation and applications. Background technique [0002] All-inorganic perovskite nanocrystalline CsPbX 3 (X=Cl, Br, I), due to its low synthesis cost, high fluorescence efficiency of more than 90%, narrow emission half-maximum width, and adjustable wavelength, it is widely used in solar cells, photocatalysis, display devices, lasers, and photodetectors. It has broad application value in fields such as bioluminescent labeling and bioluminescent labeling, especially in the application field of solar cells, and its photoelectric conversion efficiency can reach more than 20%. Usually, the preparation of perovskite nanocrystals adopts high-temperature hot injection method (Nano Lett., 2015, 15(6), 3692-3696). On the one hand, the preparation conditions are relatively harsh. The synthesis cost is increased, the synthesis e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C09K11/67C09K11/02B82Y20/00B82Y30/00B82Y40/00B01J27/135
Inventor 王选东朱明山曾力希
Owner JINAN UNIVERSITY
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