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Preparation method of cadmium selenide nanocrystal assembly with narrow size distribution

A nanocrystalline, narrow-sized technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of difficult assembly of nanocrystals, achieve low cost, easy operation, and improve photovoltaic conversion efficiency Effect

Active Publication Date: 2015-04-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the limitations of traditional organic phase nanocrystal assembly, and solve the assembly problem of nanocrystals with narrow size distribution

Method used

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  • Preparation method of cadmium selenide nanocrystal assembly with narrow size distribution
  • Preparation method of cadmium selenide nanocrystal assembly with narrow size distribution
  • Preparation method of cadmium selenide nanocrystal assembly with narrow size distribution

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Put 0.20mmol cadmium stearate and 0.05mmol selenium powder into a three-necked bottle containing 20mL octadecene at room temperature, so that the concentration of cadmium stearate is 10mmol / L, and install a condensation reflux device for the three-necked bottle. Pass inert gas, and cycle vacuum 5 times to remove excess moisture and air. Under the protection of inert gas, the temperature was raised to 200°C, and the reaction was carried out at 200°C for 60 minutes. The reaction was stopped, and the cooling rate was controlled to be 5°C / min. The crude product was centrifuged at 10,000 r / min in a high-speed centrifuge, and the lower precipitate was collected. Then mix the precipitate with isopropanol solution, continue to centrifuge with a high-speed centrifuge at 10,000 r / min, and collect the lower layer of precipitate. The precipitate was dissolved in toluene solvent to obtain CdSe nanocrystal assembly with narrow size distribution. UV-Vis absorption spectra of nanocr...

Embodiment 2

[0021] Put 0.15mmol cadmium stearate and 0.05mmol selenium powder into a three-necked bottle containing 10mL octadecene at room temperature, so that the concentration of cadmium stearate is 15mmol / L, and install a condensation reflux device for the three-necked bottle. Pass inert gas, and cycle vacuum 5 times to remove excess moisture and air. Under the protection of inert gas, the temperature was raised to 250°C, and the reaction was carried out at 250°C for 30 minutes. Stop the reaction, and control the cooling rate to 15°C / min. The crude product was centrifuged at 10,000 r / min in a high-speed centrifuge, and the lower precipitate was collected. Then mix the precipitate with isopropanol solution, continue to centrifuge with a high-speed centrifuge at 10,000 r / min, and collect the lower layer of precipitate. The precipitate was dissolved in toluene solvent to obtain CdSe nanocrystal assembly with narrow size distribution. The resulting SEM image of the nanocrystalline asse...

Embodiment 3

[0023] Put 0.10mmol cadmium stearate and 0.05mmol selenium powder into a three-necked bottle containing 5mL of octadecene at room temperature, so that the concentration of cadmium stearate is 20mmol / L, and install a condensation reflux device for the three-necked bottle. Pass inert gas, and cycle vacuum 5 times to remove excess moisture and air. Under the protection of inert gas, the temperature was raised to 300°C, and the reaction was carried out at 300°C for 10 minutes. The reaction was stopped, and the cooling rate was controlled to be 30°C / min. The crude product was centrifuged at 10,000 r / min in a high-speed centrifuge, and the lower precipitate was collected. Then mix the precipitate with isopropanol solution, continue to centrifuge with a high-speed centrifuge at 10,000 r / min, and collect the lower layer of precipitate. The precipitate was dissolved in toluene solvent to obtain CdSe nanocrystal assembly with narrow size distribution. The resulting SEM image of the n...

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Abstract

The invention relates to a preparation method of a cadmium selenide nanocrystal assembly with narrow size distribution. The method is as below: filling cadmium stearate and selenium powder at room temperature into a container containing octadecene, and installing a condensation reflux device in the container; introducing inert gas, and heating to 200-300 DEG C for reaction; after the reaction, cooling to room temperature with cooling rate controlled at 5-30 C / min; separating reaction products and collecting a lower layer precipitate; mixing isopropyl alcohol solution with the precipitation for continuous separation, and collecting a lower layer precipitate; and dissolving the precipitate in a toluene solvent, so as to obtain a CdSe nanocrystal assembly with narrow size distribution. The method has the advantages of simple operation, short production cycle, good product stability, low cost, narrow energy gap of CdSe material, more photon absorption and improvement on photovoltaic conversion efficiency. The invention provides a novel thinking for preparation of other organic nanocrystal assembly and provides possibility for the commercialized application of nano-materials.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and relates to a method for preparing a cadmium selenide nanocrystal assembly with a narrow size distribution, and the assembly can be used for preparing photovoltaic devices. Background technique [0002] Cadmium selenide (CdSe) is a well-known II-VI semiconductor nanocrystal, mainly including wurtzite crystal phase and zinc blende crystal phase. It has a band gap of 1.797eV in the wurtzite crystal phase and a band gap of 1.712eV in the sphalerite crystal phase. ( M, Wang Z, Myalitsin A, et al. Optical imaging of CdSe nanowires with nanoscale resolution, Angewandte Chemie International Edition, 2011, 50(48):11536-11538.). The bandwidth of cadmium selenide is relatively narrow. Compared with other materials, it can absorb more photons and improve the efficiency of photovoltaic devices (Huang Jiang. Research on the equivalent circuit of charge transfer state and multiple charge...

Claims

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Application Information

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IPC IPC(8): C01B19/04B82Y30/00
CPCC01B19/007C01P2002/80C01P2002/84C01P2004/03C01P2004/20C01P2004/61
Inventor 封伟张博沈永涛
Owner TIANJIN UNIV
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