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Preparation method of cds-bi2s3 composite nanocrystals by partial cation exchange reaction

A cation exchange, cds-bi2s3 technology, applied in the fields of nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of complex synthesis of nanocrystals, increase the complexity and cost of synthesis process, and high cost, and achieve low requirements for experimental equipment. The effect of convenient operation and simple experimental process

Inactive Publication Date: 2011-12-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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Problems solved by technology

However, this kind of synthesis method has shortcomings and disadvantages: on the one hand, the synthesis of parent material nanocrystals is more complicated and the cost is higher; There is also spontaneous nucleation and growth in the liquid phase. In the experiment, the ratio and concentration of the parent material and the second phase material need to be precisely controlled, which undoubtedly increases the complexity and cost of the synthesis process.

Method used

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  • Preparation method of cds-bi2s3 composite nanocrystals by partial cation exchange reaction
  • Preparation method of cds-bi2s3 composite nanocrystals by partial cation exchange reaction
  • Preparation method of cds-bi2s3 composite nanocrystals by partial cation exchange reaction

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Embodiment 1

[0034] First weigh 0.0005mol Cd(Ac) 2 2H 2 O (0.1333g) and 0.004mol thiourea (0.3045g), ie thiourea and Cd(Ac) 2 2H 2 O molar ratio is 8. The above weighed Cd (Ac) 2 2H 2 O and thiourea were dissolved together in 50 mL of deionized water, and ultrasonically dissolved for half an hour to form a colorless transparent aqueous solution. The above mixed aqueous solution was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene (capacity 80 mL), placed in an oven, and reacted at 150° C. for 2 hours. After cooling to room temperature, the bright yellow precipitate was collected by centrifugation (10000rpm, 10min), washed twice with deionized water and absolute ethanol, and finally dried in an oven at 60°C for 6 hours. The prepared flower-like CdS nanocrystalline powder is placed in a desiccator for later use.

[0035] figure 1 a is the XRD pattern of CdS parent nanocrystals, all the diffraction peaks are consistent with the standard card of wurtz...

Embodiment 2

[0037] Weigh 0.005 g of dried flower-like CdS nanocrystalline powder, then disperse it in 50 g of ethylene glycol, and process it ultrasonically for 1 hour to form a suspension with a milk concentration of 0.0002 M. Mix 20 mL of CTAB ethylene glycol solution with a concentration of 0.005M and 15 g of the ethylene glycol suspension of the flower-like CdS nanocrystal powder, and stir for 15 min. Add 2mL of Bi(NO 3 ) 3 ·5H 2 O ethylene glycol solution, stirred at room temperature for 15 min, and then placed in an oil bath at 77 ° C for 1.5 hours of heat treatment. After the reaction was over, it was taken out from the oil bath and cooled to room temperature. The precipitate obtained by the reaction was separated from the ethylene glycol solution by centrifugation (10000 rpm, 10 min), and then washed twice with deionized water and absolute ethanol. Finally, it was dried in an oven at 60° C. for 6 hours.

[0038] figure 1 B is the CdS-Bi obtained in Example 2 2 S 3 The XRD ...

Embodiment 3

[0040] Weigh 0.005 g of dried flower-like CdS nanocrystalline powder, then disperse it in 50 g of ethylene glycol, and process it ultrasonically for 1 hour to form a suspension with a milk concentration of 0.0002 M. Mix 20 mL of CTAB ethylene glycol solution with a concentration of 0.005 M and 15 g of the ethylene glycol suspension of the flower-like CdS nanocrystal powder, and stir for 15 min. Add 2mL of Bi(NO 3 ) 3 ·5H 2 O ethylene glycol solution, stirred at room temperature for 15 min, and then placed in an oil bath at 90° C. for 1.5 hours. After the reaction was over, it was taken out from the oil bath and cooled to room temperature. The precipitate obtained by the reaction was separated from the ethylene glycol solution by centrifugation (10000 rpm, 10 min), and then washed twice with deionized water and absolute ethanol. Finally, it was dried in an oven at 60° C. for 6 hours. All the other are with embodiment 2. Figure 4 a is the CdS-Bi prepared in this example ...

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Abstract

The invention relates to a method for preparing CdS-Bi2S3 composite nanocrystals by utilizing partial cation exchange reactions. It is characterized in that the flower-like CdS nanocrystals are first synthesized by a hydrothermal method, and then the flower-like CdS nanocrystals are combined with the newly formed Bi2S3 nanocrystals through a partial cation exchange reaction, so that the properties of CdS and Bi2S3 can be integrated into a single composite nanocrystal. Crystal. The advantage of this method is that in the process of synthesizing composite nanocrystals, the independent nucleation and growth of the second phase material Bi2S3 can be avoided, thereby realizing the effective compounding of CdS and Bi2S3 on the nanoscale; the advantage of this method is that the experimental operation is simple, The cost is low, and the requirements for experimental equipment are low, and it can be extended to the synthesis of other binary system nanocomposites.

Description

technical field [0001] The invention relates to a method for preparing CdS-Bi by partial cation exchange reaction 2 S 3 Methods for Composite Nanocrystals. Prepared CdS-Bi 2 S 3 Composite nanocrystals are expected to be applied in optoelectronic devices such as solar cells. It belongs to the field of nanomaterials. Background technique [0002] Nanomaterials, especially inorganic nanocrystals, have attracted much attention in recent years due to their ability to produce properties not found in bulk materials on a smaller scale. However, the properties and functions of a single inorganic nanocrystal are limited after all. The performance of a single nanocrystal can be expanded and improved through the composite of different types of inorganic nanocrystals at the nanoscale, enhancing the original or obtaining new properties. Although this is the most commonly applied strategy in materials science research and engineering, its combination with nanotechnology adds new dim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G11/02C30B29/46H01L31/0328C01G29/00B82B3/00
Inventor 高濂何小波
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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