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Radial all-inorganic perovskite nanomaterial and preparation method thereof

A nano-material and radial technology, applied in the field of perovskite materials and its preparation, can solve the problems of many surface defects, unfavorable effective separation of electrons and holes, and instability of zero-dimensional perovskite materials, achieving large specific surface area, The effect of improving photoelectric performance

Active Publication Date: 2019-09-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The zero-dimensional perovskite material is unstable and has many surface defects, which makes it easy for electrons and holes to recombine on the surface, which is not conducive to the effective separation of electrons and holes

Method used

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  • Radial all-inorganic perovskite nanomaterial and preparation method thereof
  • Radial all-inorganic perovskite nanomaterial and preparation method thereof
  • Radial all-inorganic perovskite nanomaterial and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] (1) 0.1g of cesium carbonate (0.3mmol), 0.3mL (1mmol) of oleic acid and 3.75mL of octadecene were fully reacted and dissolved under an inert atmosphere at a temperature of 120°C to obtain solution I;

[0048] (2) Mix 69mg (0.188mmol) of lead bromide, 0.5mL (1.5mmol) of oleic acid and 10mL (0.03mol) of oleylamine, and fully dissolve them under an inert atmosphere at a temperature of 120°C to obtain solution II;

[0049] (3) Raise the temperature of solution II to 160°C, inject 0.4mL of solution I into solution II (10.5mL), and continue to react and stir;

[0050] (4) Keep stirring at the same temperature for 12 hours to obtain the reaction solution, and finally centrifuge, separate and wash to obtain the final product.

[0051] figure 1For the XRD collection of products prepared in this embodiment, it can be confirmed by observing the XRD collection that the product is composed of CsPbBr 3 , Judging from the intensity of diffraction peaks in XRD, the main growth planes...

Embodiment 2

[0067] (1) 0.1g (0.3mmol) cesium carbonate, 0.35mL (1.1mmol) oleic acid and 3.75mL octadecene were fully reacted and dissolved under an inert atmosphere at a temperature of 120°C to obtain solution I;

[0068] (2) Dissolve 69mg (0.188mmol) of lead bromide and 0.5mL (1.5mmol) of oleic acid in 10mL (0.03mol) of oleylamine under an inert atmosphere at a temperature of 120°C to obtain solution II;

[0069] (3) Raise the temperature of solution II to 150°C, inject 0.4mL of solution I into solution II, and continue the reaction and stirring;

[0070] (4) Maintain the same temperature and continue to stir the reaction for 12 hours to obtain the reaction solution, and finally obtain the product after centrifugation, separation and washing.

[0071] Figure 6 The SEM image of the product prepared for this example, as can be seen from the figure, the product CsPbBr prepared at 150 ° C 3 It has a unilateral radial perovskite structure and is composed of about 10 perovskite nanowires. T...

Embodiment 3

[0073] (1) 0.1g (0.3mmol) cesium carbonate, 0.35mL (1.1mmol) oleic acid and 3.75mL octadecene were fully reacted and dissolved under an inert atmosphere at a temperature of 120°C to obtain solution I;

[0074] (2) Dissolve 69mg (0.188mmol) of lead bromide and 0.5mL (1.5mmol) of oleic acid in 5mL (0.015mol) of oleylamine under an inert atmosphere at a temperature of 120°C to obtain solution II;

[0075] (3) Raise the temperature of solution II to 180°C, inject 0.4mL of solution I into solution II, and continue to react and stir;

[0076] (4) Maintain the same temperature and continue to stir the reaction for 12 hours to obtain the reaction solution, and finally obtain the product after centrifugation, separation and washing.

[0077] After testing, the morphology of the product prepared in this example is basically the same as that in Example 1.

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Abstract

The invention discloses a radial all-inorganic perovskite nanomaterial. The nanomaterial comprises a center and nanowires radially growing from the center along the two-dimensional direction, wherein the center is composed of a plurality of perovskite nanoparticles with a particle diameter of 30-80 nm, a particle size of the center is 100-200 nm, the nanowires have a diameter of 30-80 nm and a length of 2-20 [mu]m, a structural formula of the nanomaterial is CsPbX3, and X is selected from Cl, Br or I. A preparation method comprises the following steps: (1) mixing cesium carbonate, oleic acid and octadecene to obtain a solution I; (2) mixing a lead halide, oleic acid and oleylamine to obtain a solution II, wherein a volume ratio of oleic acid to oleylamine is 1:10 or less; and (3) mixing the solution I with the solution II, and fully carrying out a reaction to obtain the radial all-inorganic perovskite material. The invention discloses an all-inorganic perovskite nanomaterial with a completely new morphology, the nanomaterial is radial, has a regular and unique morphology, and is expected to be used in the fields such as solar cells and photo-catalysis.

Description

technical field [0001] The invention relates to the field of perovskite materials and preparation thereof, in particular to a radial all-inorganic perovskite nanometer material and a preparation method thereof. Background technique [0002] Lead halide perovskite nanomaterials (Lead halide perovskite nanomaterials) are widely used in light-emitting and display devices, solar photovoltaic cells, photoelectric Detectors and other aspects have shown attractive application prospects. [0003] The zero-dimensional perovskite material is unstable and has many surface defects, which makes it easy for electrons and holes to recombine on the surface, which is not conducive to the effective separation of electrons and holes. How to improve the stability of perovskite materials and control the effective separation of electrons and holes has become the direction of everyone's attention, and one-dimensional and multi-dimensional perovskite materials have become a feasible method. [00...

Claims

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Application Information

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IPC IPC(8): C01G21/00C09K11/66B82Y40/00
CPCB82Y40/00C01G21/006C01P2002/34C01P2004/16C01P2004/50C01P2004/62C01P2004/64C09K11/665
Inventor 赵高凌李华正卢王威韩高荣
Owner ZHEJIANG UNIV
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