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Preparation method of core-shell structure nanocrystal

A technology of core-shell structure and nanocrystals, applied in nanotechnology, nano-optics, nanotechnology, etc., can solve problems such as low fluorescence intensity, lattice defects on the surface of the shell layer, poor photothermal stability of core-shell structure nanocrystals, etc.

Inactive Publication Date: 2020-04-17
TCL CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nanocrystals with a core-shell structure, aiming at solving the problem of simply using the shell source precursor for continuous injection growth in the existing method for preparing nanocrystals with a core-shell structure, resulting in nano On the particle seed surface of the crystal, the lattice stress between the atoms and the shell atoms is relatively large, resulting in poor photothermal stability of the core-shell structure nanocrystal, uneven size, lattice defects on the shell surface of the epitaxial crystal, and low fluorescence intensity. question

Method used

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preparation example Construction

[0016] The embodiment of the present invention provides a method for preparing a core-shell structure nanocrystal, which includes the following steps:

[0017] S01. Provide a quantum dot core, disperse the quantum dot core in a solution containing an organic amine for heat treatment;

[0018] S02. Perform N shell growth on the surface of the quantum dot core to prepare N shell layers to obtain core-shell structured nanocrystals. The shell source for the shell growth includes a shell-source cation precursor and a shell-source anion precursor , The shell-source cation precursor is a metal organic carboxylate;

[0019] Between M adjacent shell layer growth steps in different sequences, organic amine is added to the shell layer growth reaction system that has formed the previous shell layer, mixed and heated, and then the next shell layer is grown;

[0020] Among them, N is a positive integer greater than or equal to 2;

[0021] M is a positive integer, and the value of M satisfies: N / 3≤M≤...

Embodiment 1

[0083] A two-step method for preparing core-shell structured nanocrystals includes the following steps:

[0084] 1. Preparation of cadmium selenide (CdSe) quantum dot core

[0085] 11) Preparation of cadmium precursor: Take 0.25mmol of CdO, 0.5mmol of octadecylphosphonic acid, and 3g of trioctylphosphine oxide and put them into a 50ml three-necked flask. Heat to 380℃ to dissolve and make it clear and transparent. And keep the solution at this temperature.

[0086] 12) Preparation of Se precursor: 0.5 mmol of Se source solution was stirred in 1 ml of trioctyl phosphine at room temperature until it became clear for later use.

[0087] 13) Preparation of CdSe quantum dots: Inject 1ml of trioctylphosphine solution into 11), and when the temperature of the solution returns to 380℃, inject 12) Se precursor for 30 seconds, then inject 10ml of octadecene to quench the reaction Wash it after cooling to room temperature.

[0088] 14) Cleaning and purification of CdSe quantum dots: Add 30ml of a...

Embodiment 2

[0099] A two-step method for preparing core-shell structured nanocrystals includes the following steps:

[0100] 1. Preparation of cadmium selenide (CdSe) quantum dot core

[0101] 11) Preparation of cadmium precursor: Take 0.25mmol of CdO, 0.5mmol of octadecylphosphonic acid, and 3g of trioctylphosphine oxide and put them into a 50ml three-necked flask. Heat to 380℃ to dissolve and make it clear and transparent. And keep the solution at this temperature.

[0102] 12) Preparation of Se precursor: 0.5 mmol of Se source solution was stirred in 1 ml of trioctyl phosphine at room temperature until it became clear for later use.

[0103] 13) Preparation of CdSe quantum dots: Inject 1ml of trioctylphosphine solution into 11), and when the temperature of the solution returns to 380℃, inject 12) Se precursor for 30 seconds, then inject 10ml of octadecene to quench the reaction Wash it after cooling to room temperature.

[0104] 14) Cleaning and purification of CdSe quantum dots: Add 30ml of a...

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Abstract

The invention provides a preparation method of nanocrystal with a core-shell structure. The preparation method comprises the following steps: providing a quantum dot core, dispersing the quantum dot core in a solution containing an organic amine, and carrying out heating treatment; and carrying out shell layer growth on the surface of the quantum dot core N times to prepare N layers of shell layers so as to obtain a core-shell structure nanocrystal, wherein a shell source for shell growth comprises a shell source cationic precursor and a shell source anionic precursor, the shell source cationic precursor is a metal organic carboxylate, and between the M adjacent shell layer growth steps in different sequences, the shell layer growth reaction system with the formed previous shell layer is added with an organic amine and subjected to mixing heating, and then the next shell layer grows, wherein N is a positive integer of greater than or equal to 2, M is a positive integer, and M is greater than or equal to N / 3 and less than or equal to N-1.

Description

Technical field [0001] The invention belongs to the technical field of nanocrystalline material preparation, and in particular relates to a method for preparing a core-shell structure nanocrystal. Background technique [0002] Nanoscience and nanotechnology are emerging sciences and technologies with potential application value and economic benefits, so they have attracted the attention of scientists worldwide. Compared with bulk materials, nanocrystals (NCs) can show very interesting phenomena mainly due to their electrical, optical, magnetic and electrochemical properties (the corresponding bulk materials cannot be achieved). Semiconductor nanocrystals, also known as quantum dots (QD), have a size ranging from 1 to 10 nm. When the size of the particle size changes, the band gap valence band and conduction band of the semiconductor nanocrystals will also change (quantum size effect), such as CdSe The absorption and emission of nanocrystals cover almost the entire visible spectr...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/02C09K11/883
Inventor 程陆玲杨一行
Owner TCL CORPORATION
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