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Cadmium selenide quantum dot and nanoporous carbon composite material and preparation method therefor

A technology of nanoporous carbon and composite materials, applied in electrical components, circuits, semiconductor devices, etc., can solve the problems of low photocatalytic efficiency, less active sites, and small specific surface area of ​​composite materials, and achieve photocatalytic efficiency and life improvement , High raw material utilization rate, large specific surface area effect

Active Publication Date: 2017-07-04
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The activated carbon prepared by the ordinary method has low specific surface area and uneven pores. When forming a composite material with cadmium selenide quantum dots, due to the small specific surface area of ​​the activated carbon prepared by the ordinary method, the dispersity of the cadmium selenide quantum dots is small, and the That is, there are few active sites, resulting in low photocatalytic efficiency of the composite material; in addition, due to the uneven pores of the activated carbon prepared by the common method, it is difficult to control the grain size of the cadmium selenide quantum dots
Although super activated carbon has a large specific surface area, a large number of micropores will be generated in super activated carbon due to the presence of activator during the preparation process. When cadmium selenide quantum dots and super activated carbon form a composite material, a large number of small particle sizes will be produced. The cadmium selenide quantum dots, because the cadmium selenide quantum dots are easy to agglomerate when the particle size is small and are prone to photocorrosion in the photoreaction process, so the photocatalytic efficiency and lifespan of the composite material will be reduced.
In addition, the inhomogeneous pores of super activated carbon will also make it difficult to control the grain size of CdSe quantum dots.

Method used

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  • Cadmium selenide quantum dot and nanoporous carbon composite material and preparation method therefor
  • Cadmium selenide quantum dot and nanoporous carbon composite material and preparation method therefor

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preparation example Construction

[0029] The method for preparing cadmium selenide quantum dots and nanoporous carbon composite material according to the second aspect of the present invention is used to prepare the cadmium selenide quantum dots and nanoporous carbon composite material according to the first aspect of the present invention, including the step of: Under normal pressure, disperse an equal volume of cadmium salt solution into the nanoporous carbon, and then pass in excess hydrogen selenide gas with inert gas as carrier gas. After the reaction, wash and vacuum dry to obtain cadmium selenide quantum dots And nanoporous carbon composite material, wherein the cadmium selenide quantum dots are grown in situ on the surface of the nanoporous carbon, and the nanoporous carbon is obtained by calcining the zeolite imidazole ester coordination polymer under the protection of inert gas. The equal volume dispersion means that the total volume of the cadmium salt solution is equal to the volume of the solvent us...

Embodiment 1

[0038] Under the protection of nitrogen, ZIF-8 and 4 times the molar ratio of KOH are calcined at 1000°C for 3 hours, and then the temperature is lowered. The product is soaked in concentrated hydrochloric acid to remove zinc metal, washed three times with water, and the black powder is dried at 120°C for 12 hours to obtain Nanoporous carbon, the BET specific surface area of ​​nanoporous carbon is 1800m 2 / g, the pore size is 3.7nm.

[0039] Under normal temperature and pressure, 0.1ml of cadmium nitrate aqueous solution with a concentration of 40% by mass was dispersed into 100mg of nanoporous carbon, and then nitrogen was used as a carrier gas to pass excess H 2 After the reaction, the Se gas is washed three times with ethanol, and then vacuum-dried at 60°C for 8 hours to obtain the CdSe@NPC composite material.

[0040] The CdSe@NPC composite material was determined by X-ray polycrystalline diffraction, which showed that the structure of the nanoporous carbon loaded with cadmium s...

Embodiment 2

[0042] Under the protection of nitrogen, the ZIF-8 and 4 times the molar ratio of KOH were calcined at 900°C for 3 hours, and then the temperature was lowered. The product was soaked in concentrated hydrochloric acid to remove zinc metal, washed with water three times, and the black powder was dried at 120°C for 12 hours to obtain Nanoporous carbon, the BET specific surface area of ​​nanoporous carbon is 1500m 2 / g, the pore size is 3.9nm.

[0043] Under normal temperature and pressure, 0.1ml of cadmium chloride aqueous solution with a concentration of 20% by mass was dispersed into 100mg of nanoporous carbon, and then argon was used as a carrier gas to introduce excess H 2 After the reaction, the Se gas is washed three times with ethanol, and then vacuum-dried at 60°C for 8 hours to obtain the CdSe@NPC composite material.

[0044] The CdSe@NPC composite material was determined by X-ray polycrystalline diffraction, and the structure was similar to that of Example 1. N under 77K 2 T...

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Abstract

The invention provides a cadmium selenide quantum dot and nanoporous carbon composite material and a preparation method therefor. The cadmium selenide quantum dot and nanoporous carbon composite material is formed by cadmium selenide quantum dots and nanoporous carbon in a compounding manner; the cadmium selenide quantum dots are grown on the surface of the nanoporous carbon in an in-situ manner; and the nanoporous carbon is obtained by calcining a zeolite imidazate type coordination polymer under protection of an inert gas. The nanoporous carbon disclosed by the invention has the advantages of large specific surface area, uniform pore channels, and large pore channel dimensions; and when the composite material is formed by the nanoporous carbon and the cadmium selenide quantum dots, the dispersity of the cadmium selenide quantum dots can be improved, the crystal particle dimensions of the cadmium selenide quantum dots can be controlled, and generation of small-dimensional cadmium selenide quantum dots can be reduced, so that the photocatalytic efficiency and the service life of the composite material are obviously improved and prolonged.

Description

Technical field [0001] The invention relates to the technical field of quantum dot synthesis methods, in particular to a cadmium selenide quantum dot and nanoporous carbon composite material and a preparation method thereof. Background technique [0002] The direct conversion of solar energy into electrical or chemical energy, or the use of solar energy to drive chemical reaction processes is of great significance. For example, it can solve the problem of fossil energy being depleted, and compared to fossil energy, solar energy is cleaner. In sunlight, ultraviolet light only accounts for ~5% of the total energy of sunlight, and visible light accounts for ~45% of the total energy of sunlight. Due to the high photon energy of ultraviolet light, it may damage the structure of organic materials, so sunlight is used reasonably and efficiently. Visible light is one of the hotspots in photochemical research. [0003] Quantum dot (QD, quantum dot), such as CdS, CdSe, ZnSe, ZnO, InP, InAs,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/028H01L31/0296H01L31/0352
CPCH01L31/028H01L31/0296H01L31/035218
Inventor 李亚丰杭云海
Owner CHANGCHUN UNIV OF TECH
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