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Blue light CdSe nanosheet crystal form regulation and control method

A technology of crystal form control and nanosheets, which is applied in nanotechnology, nano-optics, nanotechnology, etc., can solve the problems of incompatibility, differences in synthesis methods, and inability to synthesize at the same time, and achieve long storage time, narrow half-peak width, and centrifugation. The effect of easy purification

Active Publication Date: 2019-06-18
合肥净龙环保科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing synthesis technology can obtain nanosheets with two crystal structures, the synthesis methods of the two crystal forms are very different, and they cannot be synthesized at the same time, nor can they be converted to each other.

Method used

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  • Blue light CdSe nanosheet crystal form regulation and control method
  • Blue light CdSe nanosheet crystal form regulation and control method
  • Blue light CdSe nanosheet crystal form regulation and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1, dissolve 0.9mmol cadmium acetate dihydrate and 0.15mmol selenium powder in 30ml polar solvent ODE, then add 0.15mml oleic acid, mix well, and heat up to 140°C, 150°C and 160°C under the protection of inert gas ℃, react for 1h, and cool to obtain blue-light hexagonal wurtzite CdSe nanosheets;

[0017] Step 2, mix the wurtzite CdSe nanosheet solution with ethanol and hexane at a volume ratio of 1:1:3, and centrifuge at a speed of 8000r / min, pour off the supernatant after centrifugation, and repeat the centrifugation for 2-4 times. The purer CdSe nanosheets were obtained, and then dispersed into n-hexane for storage. See the test results figure 1 , image 3 and Figure 4 , indicating that the nanosheets with wurtzite structure are all synthesized at the temperature between 140-160°C, and the emission peaks are all around 454nm.

Embodiment 2

[0019] This example is the same as Example 1, except that the reaction temperature in Example 1 is changed from 140°C to 170°C, and the reaction time is changed from 1h to 3min. See the test results figure 1 and image 3 , it can be seen that at the reaction temperature of 170°C, the emission spectrum of the nanosheets has two peaks, one at 454nm and one at 465nm. It shows that the solution contains both face-centered cubic sphalerite structure nanosheets and hexagonal wurtzite structure nanosheets.

Embodiment 3

[0021] This example is the same as Example 1, except that the reaction temperature in Example 1 is changed from 140° C. to 180° C., and the reaction time is changed to 1, 3, and 5 minutes. See the test results figure 2 and image 3 , it can be seen that there is only 454nm main peak at 1min, and there are two main peaks in the emission spectrum at 3min, and the emission peak is red-shifted from 454nm to 464nm at 5min, indicating that the crystal structure of the nanosheets has changed from hexagonal wurtzite to face-centered cubic sphalerite .

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Abstract

The invention discloses a blue light CdSe nanosheet crystal form regulation and control method. According to the blue light CdSe nanosheet crystal form regulation and control method, reaction temperature is reduced, and reaction time is prolonged based on conventional blue light CdSe nanosheet synthesis, wherein the CdSe nanosheet is prepared through adding of cadmium acetate dihydrate, selenium powder, and oleic acid into octadecene (ODE), and degrassing at inert atmosphere. The advantages are that: accurate regulation and control of reaction temperature and reaction time are adopted, so thatstructure mutual conversion of synthesized nanosheet between face centered cubic zinc blende structure and hexagonal wurtzite structure is realized, and nanosheet crystal structures, emission peaks,and sizes can be adjusted and controlled preferably; and in addition, Se-ODE is taken as the selenium source in conventional wurtzite synthesis technology, in the blue light CdSe nanosheet crystal form regulation and control method, Se powder is taken as a selenium instead of Se-ODE, Se-ODE synthesis time is about 6h, when Se powder is adopted, reaction time is only 3min to 1h, and unreacted Se powder can be precipitated directly, so that centrifugation purification is more convenient.

Description

technical field [0001] The invention relates to the technical field of nanomaterials for photoelectric display lighting, in particular to a method for regulating the crystal form of blue-light CdSe nanosheets. Background technique [0002] The successful synthesis of colloidal quantum dots (Quantum Dots) in the last century opened a new door for the development of low-dimensional quantum materials. Due to the existence of the quantum confinement effect on the three-dimensional scale, the energy level distribution of quantum dots is closely related to its size. Therefore, at present, most researchers adjust the photoelectric properties of this material by adjusting the size of quantum dots. In addition, through further growth regulation and adjustment of the shape of the material, we can obtain quantum dots that are only in two-dimensional or one-dimensional scale. Materials with quantum confinement effects on the dimensional scale, namely: quantum rods (Quantum Rods) or nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C09K11/88B82Y40/00B82Y20/00
Inventor 曹万强张阮张超键梅明郑康
Owner 合肥净龙环保科技有限公司
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