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Core-shell structure nanocrystal and preparation method thereof

A nanocrystal and shell structure technology, applied in nanotechnology, nanooptics, nanotechnology, etc., can solve the problems of low quantum yield and poor optical stability, and achieve the effect of high luminous efficiency

Inactive Publication Date: 2018-01-19
SUZHOU XINGSHUO NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of core-shell structure nanocrystal and preparation method thereof, to solve existing Ag 2 The problems of poor optical stability and low quantum yield of S nanocrystals

Method used

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  • Core-shell structure nanocrystal and preparation method thereof
  • Core-shell structure nanocrystal and preparation method thereof

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preparation example Construction

[0029] In another typical embodiment of the present invention, a method for preparing nanocrystals with a core-shell structure is provided, including the following process: Step 1, preparing nanocrystal cores in the oil phase; step 2, adding The first zinc precursor, the Zn element in the first zinc precursor exchanges the Ag element in the nanocrystal core by cations, and obtains the Zn-doped first shell layer coated on the outside of the nanocrystal core; step 3, in the first shell The outer layer is covered with the second shell layer; wherein, the composition of the nanocrystalline core is Ag 2 S, the composition of the first shell is Zn x Ag 2(1-x) S, the composition of the second shell layer is ZnS, where 0<x<1.

[0030] Step 1 is the preparation process of the nanocrystalline core, compared to the aqueous phase synthesis of Ag 2 S nanocrystal nuclei, the oil phase can provide a higher reaction temperature, thereby increasing the nucleation rate and crystallinity of n...

Embodiment 1

[0049] (1) Step 1: Prepare nanocrystalline nuclei in the oil phase:

[0050] Add 170 mg of silver nitrate, 1 ml of oleic acid, 10 ml of n-dodecanethiol, and 30 ml of octadecene into a 100 ml three-necked flask, stir and remove water and oxygen to form a solution containing Ag ions.

[0051] Mix the S powder with the oleylamine solution, stir to dissolve the S powder, and obtain a S precursor solution with a concentration of 1M. At 130 degrees Celsius, 500 microliters of S precursor solution was hot injected into the solution containing Ag ions, and reacted for 10 minutes to obtain Ag 2 S nanocrystalline core.

[0052] (2) Step 2: Diethyl zinc and octadecene were mixed to obtain a diethyl zinc octadecene solution with a concentration of 1M. At 130 °C, hot inject 0.2 ml of diethyl zinc octadecene solution into the Ag 2 In the solution of S nanocrystal nuclei, react for 30min, and get coated in Ag 2 Zn outside the core of S nanocrystals x Ag 2(1-x) S first shell.

[0053] ...

Embodiment 2

[0055] (1) Step 1: Prepare nanocrystalline nuclei in the oil phase:

[0056] Add 170 mg of silver nitrate, 1 ml of oleic acid, 10 ml of n-dodecanethiol, and 30 ml of octadecene into a 100 ml three-necked flask, stir and remove water and oxygen to form a solution containing Ag ions.

[0057] Mix the S powder with the oleylamine solution, stir to dissolve the S powder, and obtain a S precursor solution with a concentration of 1M. At 130 degrees Celsius, 500 microliters of S precursor solution was hot injected into the solution containing Ag ions, and reacted for 10 minutes to obtain Ag 2 S nanocrystalline core.

[0058] (2) Step 2: Diethyl zinc and octadecene were mixed to obtain a diethyl zinc octadecene solution with a concentration of 1M. At 140 °C, hot inject 0.2 ml of diethyl zinc octadecene solution into the Ag 2 In the solution of S nanocrystal nuclei, react for 30min, and get coated in Ag 2 Zn outside the core of S nanocrystals x Ag 2(1-x) S first shell.

[0059] ...

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Abstract

The invention discloses a core-shell structure nanocrystal. The core-shell structure nanocrystal comprises a nanocrystal core, a Zn-doped first shell layer wrapping the nanocrystal core and a second shell layer wrapping the first shell layer; and the constitution of the nanocrystal core is Ag2S, the constitution of the first shell layer is ZnxAg2(1-x)S and the constitution of the second core shellis ZnS, wherein x is more than 0 and less than 1. The prepared core-shell structure nanocrystal has high luminous efficiency, the fluorescent emission peak can be continuously controlled between 1000and 1200, and the problem that the existing Ag2S nanocrystal is low in stability, easy to aggregate and low in luminous efficiency is solved.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a core-shell structure nanocrystal and a preparation method thereof. Background technique [0002] Nanocrystals are semiconductor nanomaterials with three-dimensional dimensions ranging from 1 to 20 nanometers, which have the advantages of narrow half-peak width, good photostability, and controllable wavelength. Due to its special photoelectric properties and excellent photophysical stability, its electrical and optical properties can be significantly adjusted by adjusting the size of the nanocrystal to adjust the corresponding band gap of the nanocrystal. Therefore, only adjusting the size of the nanocrystal It is possible to adjust the emission wavelength and make it exhibit its excellent color purity and high luminous efficiency. [0003] As an excellent fluorescent light-emitting material, and the surface of nanocrystals is easy to modify, nanocrystals were ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/58B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/02C09K11/584
Inventor 邱春明张卫孙海龙朱凯文
Owner SUZHOU XINGSHUO NANOTECH CO LTD
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