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Method for preparing lead selenide nanocrystals

A nanocrystal and nanocrystal particle technology is applied in the fields of solvent synthesis chemistry and nano-semiconductor material preparation technology, which can solve the problems of expensive solvent, cumbersome operation process, serious environmental pollution, etc., and achieves low price, simple preparation process, and solvent simple effect

Inactive Publication Date: 2010-09-29
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the shortcoming of this method is: (1), will use different solvents such as oleic acid, stearyl and trioctylphosphine in the synthetic process
(2), solvents are expensive and cause serious environmental pollution
(3), the operation process is relatively cumbersome

Method used

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  • Method for preparing lead selenide nanocrystals
  • Method for preparing lead selenide nanocrystals
  • Method for preparing lead selenide nanocrystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The specific preparation steps of this embodiment are as follows:

[0033] a. First, get 80 mg of selenium powder and put it into a two-necked flask with cooling conditions outside it, drive out the air in the flask, and fill it with argon.

[0034] b. Inject 5 milliliters of oleylamine with a syringe and stir with a magnet.

[0035] c. Heat the above-mentioned selenium powder mixed solution to 220°C with an oil bath, the mixed solution slowly changes from a black suspension to a transparent light orange liquid, and keep at 220°C for more than half an hour.

[0036] d, secondly, get 556 milligrams of lead chloride and put it into a 50 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.

[0037] e. After heating the above-mentioned lead chloride mixed solution to 160°C with an oil bath, continue to heat up to 220°C after passing in argon gas, the solution becomes a white...

Embodiment 2

[0043] The specific preparation steps of this embodiment are as follows:

[0044] a. First, get 80 mg of selenium powder and put it into a two-necked flask with cooling conditions outside it, drive out the air in the flask, and fill it with argon.

[0045] b. Inject 5 milliliters of oleylamine with a syringe and stir with a magnet.

[0046] c. Heat the above-mentioned selenium powder mixed solution to 220°C with an oil bath, the mixed solution slowly changes from a black suspension to a transparent light orange liquid, and keep at 220°C for more than half an hour.

[0047] d, secondly, get 556 milligrams of lead chloride and put it into a 50 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.

[0048] e. After heating the above-mentioned lead chloride mixed solution to 160°C with an oil bath, continue to heat up to 220°C after passing in argon gas, the solution becomes a white...

Embodiment 3

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

[0055] a. First, get 80 mg of selenium powder and put it into a two-necked flask with cooling conditions outside it, drive out the air in the flask, and fill it with argon.

[0056] b. Inject 5 milliliters of oleylamine with a syringe and stir with a magnet.

[0057] c. Heat the above-mentioned selenium powder mixed solution to 220°C with an oil bath, the mixed solution slowly changes from a black suspension to a transparent light orange liquid, and keep at 220°C for more than half an hour.

[0058] d, secondly, get 556 milligrams of lead chloride and put it into a 50 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 160°C with an oil bath, continue to heat up to 220°C after passing through argon, and the solution becomes a ...

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Abstract

The invention discloses a method for preparing lead selenide nanocrystals. The method comprises the following steps of: putting selenium powder in a container; removing the air from the container and filling the container with inert gas; adding alkylamine which has a long chain with a boiling point of over 180 DEG C into the container; fully stirring and heating the selenium powder and the ammonia to perform full reaction so as to form ligand; adding lead chloride into the alkylamine which has the long chain with the boiling point of over 180 DEG C, fully stirring the mixture, vacuuming the container and then heating the mixture of the lead chloride and ammonia to fully dissolve the lead chloride in the ammonia; and injecting the mixture of selenium powder into the mixture of lead chloride to perform reaction so as to obtain the lead selenide nanocrystalline particles.

Description

technical field [0001] The invention belongs to the technical field of solvent synthesis chemistry and nano semiconductor material preparation technology, and relates to a preparation method of lead selenide nano crystals. Background technique [0002] Lead selenide has attracted widespread attention as an important semiconductor material. It is a typical group IV~VI direct bandgap semiconductor with a cubic sodium chloride structure, with a small forbidden band width, spectral absorption in the mid-infrared to visible region, and remarkable infrared conductivity. Due to the narrow band gap, lead selenide can be used to produce photodetectors, photoresistors, and phototransmitters. In the case of keeping other optical properties unchanged, the use of lead selenide nanocrystals (also called quantum dots) can controllably adjust the forbidden band width, so as to better meet the needs of various devices. At present, lead selenide nanocrystals are considered to have important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04B82B3/00
CPCC01B19/04
Inventor 张浩力王天明许主国
Owner LANZHOU UNIVERSITY
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