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Green method for synthesizing appearance and size controllable semiconductor nanocrystalline

A green synthesis and nanocrystalline technology, applied in the direction of binary selenium/tellurium compounds, etc., can solve the problems of slow development

Active Publication Date: 2009-07-22
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, the green synthetic route to control the anisotropic growth of CdSe nanocrystals has been slow to develop, and is currently mainly based on systems containing organophosphine ligands.

Method used

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  • Green method for synthesizing appearance and size controllable semiconductor nanocrystalline
  • Green method for synthesizing appearance and size controllable semiconductor nanocrystalline
  • Green method for synthesizing appearance and size controllable semiconductor nanocrystalline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 2nm-6nm dotted cadmium selenide nanocrystals synthesized from vegetable oil

[0043] 0.1 mmol of cadmium oxide and 3 ml of soybean oil were put into a reactor filled with nitrogen, and the temperature was raised to 330° C., and reacted for 30 minutes to obtain a transparent solution. Then the temperature was lowered to 260° C., and 2 ml of 0.15 mmol selenium precursor (ODE-Se) dispersed in octadecene was injected into the above stirred reaction solution. The temperature of the reaction mixture is lowered by 10°C compared with the injection time, and the nanocrystals are allowed to grow, and cadmium selenide nanocrystals of 2nm-6nm can be obtained within 30 minutes. The quantum yield of nanocrystals is about 20%.

Embodiment 2

[0044] Example 2 2nm-6nm dotted cadmium selenide nanocrystals synthesized from vegetable oil

[0045] 0.1 mmol cadmium myristate and 3 ml soybean oil were put into a reactor filled with nitrogen, and the temperature was raised to 280° C. to obtain a transparent solution. Then 2 ml of 0.15 mmol of selenium precursor (ODE-Se) dispersed in octadecene was injected into the stirred reaction solution above. The temperature of the reaction mixture is lowered by 10°C compared with the injection time, and the nanocrystals are allowed to grow, and cadmium selenide nanocrystals of 2nm-6nm can be obtained within 30 minutes. The quantum yield of nanocrystals is about 20%.

Embodiment 3

[0046] Example 3 Vegetable oil synthesis of rod-shaped cadmium selenide nanocrystals with an aspect ratio of 1-10

[0047] 0.1 mmol of cadmium oxide and 3 ml of soybean oil were put into a reactor filled with nitrogen, and the temperature was raised to 330° C., and reacted for 30 minutes to obtain a transparent solution. Then the temperature was lowered to 260° C., and 2 ml of 0.12 mmol of trioctylphosphorous selenium precursor (TOP-Se) dispersed in soybean oil was injected into the stirred reaction solution above. The temperature of the reaction mixture is lowered by 10°C compared with the injection time, and the nanocrystals are allowed to grow, and rod-shaped cadmium selenide nanocrystals with an aspect ratio of 1-10 can be obtained within 30 minutes. The quantum yield of nanocrystals is about 15%.

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Abstract

The invention provides a green synthesis method of a cadmium selenide nano-crystal with controllable shape and size. Natural vegetable oil is taken as a solvent and a ligand, different selenium sources and cadmium oxide are taken as precursors, the nano-crystal can be obtained by adjusting the ratio between the ligand and the precursors, with the size adjustable from 2nm to 13nm and the ratio between the length and diameter from 1 to 10; the nano-crystal has high degree of crystallinity, fluorescence quantum efficiency is 15 percent to 40 percent and fluorescence emission spectrum is 490nm to 660nm. The obtained point nano-crystal can maintain stable sphalerite structure under high temperature, with narrow size distribution, wherein, fwhm equals to 27 plus or minus 1nm. The obtained rod-shaped or multibranched (two-branch, three-branch, four-branch) nano-crystal has quite narrow size distribution, and wide fluorescence half band width, wherein, fwhm equals to 23 plus or minus 1nm. The obtained arc-shaped and random rod-shape nano-crystal has different radiuses of curvature, wurtzite, sphalerite, twin crystal and dislocation coexist in the same nano single crystal.

Description

technology field. [0001] The invention relates to a green synthesis method of semiconductor nanocrystals with controllable shape and size. Background technique. [0002] Colloidal semiconductor nanocrystals (SNCs), which have a strong "quantum confinement effect" because they are smaller than the exciton Bohr diameter, exhibit unique size-dependent optoelectronic properties. They are widely used in basic theory and technical applications (such as optoelectronic devices, light emitting Diodes, solar cells, lasers, photoprobes, biomarkers) have aroused extensive research interest. Due to its excellent size- and shape-dependent optoelectronic properties, CdSe nanocrystals have been systematically and intensively studied as an ideal model system in many fields. Nanocrystals of various shapes and structures based on CdSe have been continuously synthesized in the past 20 years, and the research and improvement of its growth mechanism and synthesis technology have provided a basis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
Inventor 杨秀荣孙明
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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