Preparation method of PbSxSe1-x ternary nanocrystal

A nanocrystal, selenium powder technology, applied in nanotechnology, chemical instruments and methods, non-metallic elements, etc., can solve the problems of solvent and surface ligand not being the same substance, serious solvent environmental pollution, and complicated operation process, etc. Simple, low price and simple preparation process

Inactive Publication Date: 2012-08-15
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the shortcoming of present method is: (1) solvent and surface ligand are often not same substance in the synthetic process, must make ligand with oleic acid oleylamine as solvent with diphenyl ether
(2) The sulfur source is bis-trimethylsilylsulfur, which is not only expensive but also has a sulfur odor
(3) The solvent pollutes the environment seriously
(3) The operation process is relatively cumbersome

Method used

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  • Preparation method of PbSxSe1-x ternary nanocrystal
  • Preparation method of PbSxSe1-x ternary nanocrystal
  • Preparation method of PbSxSe1-x ternary nanocrystal

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Embodiment 1

[0034] The specific preparation steps of this embodiment are as follows:

[0035] a, at first, get 40 milligrams of selenium powders (0.5 millimoles) and 16 milligrams (0.5 millimoles) of sulfur powders and put into the two-necked flask that has cooling condition outside it, heating drives off air in the flask, fills with argon.

[0036] b. Inject 3 ml of oleylamine with a syringe and stir with a magnet.

[0037] c. Heat the above-mentioned (selenium powder+sulfur powder) amine mixed solution to 240°C with an oil bath, and the mixed solution slowly changes from a black suspension to a transparent light orange liquid, and keep this temperature for more than half an hour.

[0038] d. Next, put 280 mg of lead chloride into a 25 ml two-necked flask with condensed water, inject 5 ml of oleylamine with a syringe, stir with a magnet, and vacuumize for 15 minutes.

[0039] e. After heating the above-mentioned lead chloride mixed solution to 120° C. with an oil bath, pass in argon gas...

Embodiment 2

[0044] The specific preparation steps of this embodiment are as follows:

[0045] a, at first, get 55.3 milligrams of selenium powder (0.7 millimoles) and 9.6 milligrams of sulfur powders (0.3 millimoles) and put into the two-necked flask that has cooling condition outside it, get rid of air in the flask, charge into argon.

[0046] b. Inject 3 ml of oleylamine with a syringe and stir with a magnet.

[0047] c. Heat the above-mentioned selenium powder-sulfur mixed solution to 240° C. with an oil bath, and the mixed solution will slowly change from a black suspension to a transparent light orange liquid, and keep this temperature for more than half an hour.

[0048] d, secondly, get 280 milligrams of lead chloride and put it into a 25 milliliter two-necked flask with condensed water, inject 5 milliliters of oleylamine with a syringe, stir with a magnet, and vacuumize for half an hour.

[0049] e. After heating the above-mentioned lead chloride mixed solution to 120° C. with an...

Embodiment 3

[0054] The specific preparation steps of this embodiment are as follows:

[0055] a, at first, get 15.8 milligrams of selenium powders (0.2 millimoles) and 25.6 milligrams of sulfur powders (0.8 millimoles) and put into the two-necked flask that has cooling condition outside it, get rid of air in the flask, charge into argon.

[0056] b. Inject 3 ml of oleylamine with a syringe and stir with a magnet.

[0057] c. Heat the above-mentioned (selenium powder+sulfur powder) mixed solution to 240 DEG C with an oil bath, and the mixed solution slowly changes from a black suspension to a transparent light orange liquid, and keep this temperature for more than half an hour.

[0058] d, secondly, get 280 milligrams of lead chloride and put it into a 25 milliliter two-necked flask with condensed water, inject 5 milliliters of oleylamine with a syringe, stir with a magnet, and vacuumize for half an hour.

[0059] e. After heating the above-mentioned lead chloride mixed solution to 120° C...

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Abstract

The invention discloses a preparation method of PbSxSe1-x ternary nanocrystal. The method disclosed by the invention comprises the following steps of: mixing selenium powder and sulfur powder according to a certain proportion, slowly adding alkylamine which has long chain and has boiling point more than 180 DEG C, sufficiently stirring, heating (the selenium powder and the sulfur powder) amine mixed liquor into 180-260 DEG C, forming into settled solution at constant temperature, and adding the alkylamine which is dissolved with lead chloride and has the long chain and the boiling point more than 180 DEG C, so that a system is naturally cooled into room temperature after being sufficiently reacted, adding 10mL of chloroform into the system, and adding ethanol of which the volume is twice as high as the volume of the reaction solution into the reaction system, so that PbSxSe1-x ternary nanocrystal particle precipitate is separated out, therefore, the PbSxSe1-x ternary nanocrystal particle can be obtained.

Description

technical field [0001] The invention relates to a method for preparing nano crystals, which belongs to the technical fields of solvothermal synthesis chemistry and nano semiconductor material preparation. Specifically the present invention is a PbS x Se 1-x (1>x>0) Preparation method of ternary hybrid nanocrystal. Background technique [0002] Chalcogenide lead compounds have attracted widespread attention as an important semiconductor material. Their narrow band gap and large excitonic Bohr radius enable stronger electron coupling between nanoparticles, which is beneficial to the transfer of charges between nanocrystals. In addition, the lattice mismatch between PbS and PbSe is only 2%, by preparing PbS x Se 1-x Ternary nanocrystals can further optimize the carrier transport. Due to the above advantages, PbS x Se 1-x Ternary nanocrystals have been used in solar cells, thermoelectric materials, and light emitters. In the case of keeping other optical propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00B82Y40/00
CPCY02P20/133
Inventor 许主国张浩力高宝
Owner LANZHOU UNIVERSITY
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