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Method for synthesizing chain-like nanometer structure type cadmium selenide

A nanostructure, cadmium selenide technology, applied in the field of nanomaterials, can solve problems such as inability to prepare nanostructures, and achieve the effects of environmental friendliness, convenient operation, and prevention of adverse effects

Inactive Publication Date: 2006-04-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li et al. have successfully prepared CdSe microstructures, including microwires and microtubes, using CdOHCl microcrystals as templates. Due to the limitation of the template itself, it is impossible to prepare real nanostructures (Li, Y.; Wang, Z.; Ma , X.D.; Qian, X.F.; Yin, J.; Zhu, Z.K.J Solid State Chem.2004, 177, 4386.)

Method used

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  • Method for synthesizing chain-like nanometer structure type cadmium selenide
  • Method for synthesizing chain-like nanometer structure type cadmium selenide
  • Method for synthesizing chain-like nanometer structure type cadmium selenide

Examples

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Embodiment 1

[0032] First prepare 50 mL of Cd(NO 3 ) 2 aqueous solution and 10 mL of 0.006M NaOH aqueous solution; then the NaOH solution was added dropwise to Cd(NO 3 ) 2 Cd(OH) is formed in solution 2 The colloidal suspension was stirred by magnetic force for 1 hour, then filtered and washed with deionized water for 3 times to remove excess hydroxide ions. The collected amorphous Cd(OH) 2 Disperse in 70mL sodium nitrate solution with a concentration of 0.1M, put it into a polytetrafluoroethylene-lined stainless steel reaction kettle, place it in an oven, and keep it at 200°C for 20 hours; after cooling to room temperature, the white precipitate is suction filtered Collected, washed three times with deionized water, washed twice with absolute ethanol, and finally dried in a vacuum oven at 60°C for 4 hours. The prepared Cd(OH) 2 The hexagonal nanoplatelets were stored in a desiccator for later use. The above-prepared Cd(OH) 2 Hexagonal nanoplatelets were ultrasonically dispersed in...

Embodiment 2

[0034] The above-prepared Cd(OH) 2 Hexagonal nanoplatelets were ultrasonically dispersed in 65mL of deionized water to form a white suspension with a concentration of 0.0006M; 5mL of sodium selenosulfate solution with a concentration of 0.2M was added and stirred evenly by magnetic force; In a stainless steel reaction kettle lined with vinyl fluoride, place it in an oven and keep it warm at 140°C for 10 hours. After cooling to room temperature, it was collected by suction filtration, washed three times with deionized water and twice with absolute ethanol, and finally dried in a vacuum oven at 60°C for 4 hours. All the other are with embodiment 1. image 3( d) and Figure 5( e) are the XRD spectrum and TEM morphology photographs of the cadmium selenide nanocrystals prepared in this example, respectively. It can be found that cadmium selenide is all wurtzite, and the grain size is calculated by the Scherrer formula to be 25nm. The product is a hexagonal structure formed by th...

Embodiment 3

[0036] The above-prepared Cd(OH) 2 Hexagonal nanoplatelets were ultrasonically dispersed in 65mL of deionized water to form a white suspension with a concentration of 0.0006M; 5mL of sodium selenosulfate solution with a concentration of 0.2M was added and stirred evenly by magnetic force; A stainless steel reactor lined with vinyl fluoride was placed in an oven and kept at 100°C for 10 hours. After cooling to room temperature, it was collected by suction filtration, washed three times with deionized water and twice with absolute ethanol, and finally dried in a vacuum oven at 60°C for 4 hours. All the other are with embodiment 1. image 3( c) and Figure 5( d) are the XRD patterns and TEM morphology photos of the cadmium selenide nanocrystals prepared in this example, respectively. It can be found that cadmium selenide is already wurtzite, which is a surprising result, because the room temperature phase is sphalerite, and wurtzite has been prepared at such a low temperature....

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Abstract

A process for preparing the cadmium selenide with chain-type nano-structure includes such steps as synthesizing Cd(OH)2, adding sodium nitrate as mineralizing agent, hydrothermal growth of non-crystalline Cd(OH)2 colloid at 200 deg.C to obtain hexagonal nano-crystals used as sacrificial template, dispersing them in the solution of sodium selenosulfate, and hydrothermal synthesizing at 160 deg.C for 10 hr.

Description

technical field [0001] The invention relates to a method for synthesizing cadmium selenide with a chain nanostructure. It belongs to the field of nanomaterials. Background technique [0002] As a II-VI semiconductor material, cadmium selenide nanocrystals have attracted much attention in recent years due to their superior photoelectric properties, such as high optical conductivity, nonlinear optical response, and quantum size effect, and are expected to be used in Cutting-edge fields such as various optoelectronic devices, high-density memory, and biomarker materials. In particular, the performance of cadmium selenide is strongly affected by the size and distribution of nanocrystalline morphology. morphology of nanocrystals, and achieve very good controllability. Such as rod-shaped, arrow-shaped, tear-drop-shaped, three-pointed crystal, four-pointed crystal and other shapes. For the synthesis of one-dimensional nanowires, nanorods, nanobelts, and nanotubes, the existing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00C01G11/00
Inventor 高濂陈名海
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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