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Preparation method of semiconductor nanocrystals with II type core-shell structures

A technology of core-shell structure and nanocrystal, which is applied in the field of core-shell structure fluorescent semiconductor nanocrystal and its preparation, which can solve the problems of harsh reaction conditions, complicated preparation process and high synthesis cost, and achieve simplified synthesis process, uniform size distribution and stability good sex effect

Inactive Publication Date: 2013-07-03
HENAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a low-cost, simple and convenient synthesis of type II core-shell structure semiconductor nanocrystals (including CdS / ZnSe, CdS / ZnSe / ZnS, ZnSe / CdSe , ZnSe / CdSe / ZnS, CdTe / CdSe, CdTe / CdS, CdTe / CdSe / CdS and ZnSe / CdSe / ZnCdS / ZnS, etc.) to solve the current complex preparation process, harsh reaction conditions, low preparation quality, synthesis cost advanced questions

Method used

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  • Preparation method of semiconductor nanocrystals with II type core-shell structures
  • Preparation method of semiconductor nanocrystals with II type core-shell structures
  • Preparation method of semiconductor nanocrystals with II type core-shell structures

Examples

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Embodiment 1

[0026] Synthesis of CdS / ZnSe type II core-shell nanocrystals. Take 0.4 x 10 -7 mol of point-like particle CdS nanocrystals (2.3nm in diameter), 10mL liquid paraffin and 1g octadecylamine were added to a 100 mL three-path bottle (the fluorescence absorption spectrum of CdS nanocrystals is shown in figure 1 Shown in A), the mixed solution was heated to 100°C in a nitrogen atmosphere for 30 minutes to exclude oxygen, and then heated to 240°C; 5mmol of ZnO and 15mmol of oleic acid were heated and dissolved in 50ml of liquid paraffin to obtain a Zn(OA)2 solution , 5mmol of selenium was dissolved in 50ml of liquid paraffin to obtain a selenium solution, and 0.2ml of zinc oleate and 0.18ml of selenium solution were mixed and added dropwise to a three-necked bottle. After 10 min, a mixed solution of 0.4 ml zinc oleate solution and 0.34 ml selenium solution was added, and CdS / ZnSe nanocrystals with different thicknesses could be obtained by sequential operations. Sampling and observ...

Embodiment 2

[0028] Synthesis of CdS / ZnSe type II core-shell nanocrystals. Take 0.4 x 10 -7 mol point particle CdS nanocrystal (diameter is 3.1nm), 10mL of liquid paraffin and 1g of octadecylamine are added in 100 mL three-path bottle (CdS nanocrystal fluorescence absorption spectrum is shown in figure 1 Shown in A), the mixed solution was heated to 100 °C under nitrogen atmosphere for 30 minutes to exclude oxygen, and then heated to 240 °C; 5 mmol of ZnO and 15 mmol of oleic acid were heated and dissolved in 50 ml of liquid paraffin to obtain Zn(OA) 2 Solution, 5 mmol of selenium was dissolved in 50 ml of liquid paraffin to obtain a selenium solution, and 0.35 ml of zinc oleate and 0.3 ml of selenium solution were mixed and added dropwise to a three-necked flask. After 10min, add 0.6ml Zn(OA) 2 CdS / ZnSe nanocrystals with different thicknesses can be obtained by sequentially operating the mixed solution of CdS solution and 0.5ml selenium solution. Sampling and observation before each a...

Embodiment 3

[0030] Synthesis of CdS / ZnSe type II core-shell nanocrystals. Take 0.4 x 10 -7 mol point particle CdS nanocrystal (diameter is 4.4nm), the liquid paraffin of 10mL and the octadecylamine of 1g add in the 100mL three-path bottle (CdS nanocrystal fluorescence absorption spectrum is as follows figure 1 Shown in A), in the mixed solution and heated to 100°C under nitrogen atmosphere for 30 minutes to exclude oxygen, then heated to 240°C; 5mmol of ZnO and 15mmol of OA were heated and dissolved in 50ml of liquid paraffin to obtain Zn(OA) 2 Solution, dissolve 5mmol selenium in 50ml liquid paraffin to get selenium solution, take 0.7ml Zn(OA) 2 Mix it with 0.5ml of selenium solution and add it dropwise into the three-necked bottle. After 10min, add 0.9ml Zn(OA) 2 CdS / ZnSe nanocrystals with different thicknesses can be obtained by sequentially operating the mixed solution of solution and 0.8ml selenium solution. Sampling and observation before each addition. In this process, core-s...

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Abstract

The invention discloses semiconductor nanocrystals (CdS / ZnSe, ZnSe / CdSe, CdTe / CdSe, CdTe / CdS and the like) with II type structures and a preparation method of the semiconductor nanocrystals and belongs to the technical field of semiconductor nano-material preparation. According to the method, tributylphosphine (TBP) or trioctylphosphine (TOP), which is used internationally at present to dissolve selenium or tellurium to serve as a precursor of selenium or tellurium, is avoided, while a general solvent is adopted to dissolve selenium or tellurium to serve as a precursor of selenium or tellurium. The synthetic process is simple, the repeatability is good, safety and environmental protection are achieved, no glove box is needed, and the cost can be saved by more than 60%. The semiconductor nanocrystals (CdTe / CdSe, CdTe / CdS and the like) with the II type core-shell structures, synthetized according to the preparation method, are 400-650 nm in fluorescence ranges and above 60% in quantum yield and have excellent stability.

Description

technical field [0001] The invention relates to the technical field of preparation of fluorescent semiconductor nanomaterials, in particular to a core-shell structure fluorescent semiconductor nanocrystal with a type II structure and a preparation method thereof. Background technique [0002] Semiconductor nanoparticles, also known as semiconductor quantum dots, have broad application prospects in optoelectronic devices and biomarkers due to their unique photoelectric properties. The core-shell structure nanocrystal is a composite structure nanocrystal formed by coating one or more other materials on the basis of a single nanocrystal. Semiconductor core-shell structure nanocrystals can be divided into type I and type II according to the different band gaps of the core and shell materials that constitute the core-shell structure. Type I: Nanocrystals with a wide bandgap semiconductor material as the shell and a narrow bandgap semiconductor as the core. In type I semiconduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88
Inventor 李林松申怀彬徐巍巍
Owner HENAN UNIVERSITY
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