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Preparation method of graphene and zinc selenide and cadmium selenide core-shell microsphere composite nano material

A technology of composite nanomaterials and zinc selenide, which is applied in the field of preparation of graphene and zinc selenide@cadmium selenide core-shell microsphere composite nanomaterials, can solve the problems of high toxicity and the need to improve the third-order nonlinear optical properties , to achieve the effect of strong nonlinear optical properties

Active Publication Date: 2020-11-13
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the disadvantages of high toxicity of raw materials and the need to improve the third-order nonlinear optical performance in the existing preparation of core-shell composite materials, the present invention provides a non-toxic and pollution-free graphene and zinc selenide@cadmium selenide core-shell microspheres Preparation method of (G / ZnSe@CdSe) composite nanomaterials

Method used

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  • Preparation method of graphene and zinc selenide and cadmium selenide core-shell microsphere composite nano material
  • Preparation method of graphene and zinc selenide and cadmium selenide core-shell microsphere composite nano material
  • Preparation method of graphene and zinc selenide and cadmium selenide core-shell microsphere composite nano material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A: First add 0.039g (0.5mmol) of selenium powder and 0.378g (3mmol) of sodium sulfite into a three-necked flask, then add 34ml of deionized water, and add magnets; put the three-necked flask into a constant temperature collector type magnetic stirrer and The three-necked flask was protected with nitrogen, and reacted at 80° C. for 5 h to obtain a colorless and transparent sodium selenosulfate solution.

[0031] B: Put 0.053 g (0.288 mmol) of zinc acetate, 0.059 g (0.255 mmol) of cadmium acetate and 0.378 g of graphene oxide into a beaker, and add 17 ml of deionized water to the beaker, and stir and sonicate for 10 min on a magnetic stirrer , zinc acetate, cadmium acetate and graphene oxide were completely dissolved in deionized water, then the sodium selenosulfate solution prepared in the above steps was added, and placed on a magnetic stirrer to stir continuously, 10ml of hydrazine hydrate was added, stirred for 5min, and mixed liquid;

[0032] C: Transfer the mixed s...

Embodiment 2

[0036] The present embodiment is basically the same as Example 1, except that step B is: 0.053 g zinc acetate, 0.059 g cadmium acetate and 0.16 g graphene oxide are put into a beaker, and 17 ml of deionized water is added to the beaker, and Stir ultrasonically on a magnetic stirrer for 10 min, so that zinc acetate, cadmium acetate and graphene oxide are completely dissolved in deionized water, then add the sodium selenosulfate solution prepared in step 1, and put it on a magnetic stirrer to continuously stir, Add 10ml of hydrazine hydrate and stir for 5min to obtain a mixed solution.

[0037] The composite nanomaterial of graphene and zinc selenide@cadmium selenide core-shell microspheres prepared in this example is denoted as G / ZnSe@CdSe-2.

[0038] SEM images of G / ZnSe@CdSe-2 composite nanomaterials figure 2As shown, we can clearly see from the scanning electron microscope that the ZnSe / CdSe core-shell nanospheres have been successfully composited with graphene, and the co...

Embodiment 3

[0040] The present embodiment is basically the same as Example 1, except that step B is: 0.053 g zinc acetate, 0.059 g cadmium acetate and 0.112 g graphene oxide are put into a beaker, and 17 ml of deionized water is added to the beaker, and Stir ultrasonically on a magnetic stirrer for 10 min, so that zinc acetate, cadmium acetate and graphene oxide are completely dissolved in deionized water, then add the sodium selenosulfate solution prepared in step 1, and put it on a magnetic stirrer to continuously stir, Add 10ml of hydrazine hydrate and stir for 5min to obtain a mixed solution.

[0041] The composite nanomaterial of graphene and zinc selenide@cadmium selenide core-shell microspheres prepared in this example is denoted as G / ZnSe@CdSe-3.

[0042] SEM images of G / ZnSe@CdSe-3 composite nanomaterials image 3 As shown, we can clearly see from the SEM images that the ZnSe / CdSe core-shell nanospheres have been successfully composited with graphene.

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Abstract

The invention belongs to the technical field of semiconductor materials, and relates to a preparation method of a graphene and zinc selenide and cadmium selenide core-shell microsphere composite nanomaterial. The method comprises the following steps: adding deionized water into selenium powder and sodium sulfite, and carrying out heating reaction while stirring under the protection of nitrogen toobtain a sodium selenide solution; dissolving zinc acetate, cadmium acetate and graphene oxide into water, adding the sodium seleno sulfate solution, adding hydrazine hydrate while stirring, transferring into a high-pressure reaction kettle taking polytetrafluoroethylene as a lining, and reacting at 80 DEG C for 5 hours; and putting the high-pressure reaction kettle into ice water for quenching,washing with deionized water and absolute ethanol, and carrying out vacuum drying to obtain the G / ZnSe-CdSe composite nano material. Three-order nonlinear absorption of the G / ZnSe-CdSe composite nanomaterial is saturated absorption, three-order nonlinear refraction of the G / ZnSe-CdSe composite nano material is self-focusing, and the G / ZnSe-CdSe composite nano material is expected to be applied tothe novel light control fields such as a mode-locked pulse laser, an optical switch, an optical memory and an optical modulator.

Description

technical field [0001] The invention belongs to the technical field of semiconductor materials, and relates to a method for preparing a composite nanomaterial of graphene and zinc selenide@cadmium selenide core-shell microspheres. Background technique [0002] Group II-VI semiconductor nanocrystals represented by ZnSe and CdSe have significant applications in the field of nonlinear optics such as fiber lasers and optical switches due to their third-order nonlinear optical properties related to quantum size effects, surface effects, and macroscopic quantum tunneling effects. , has become a hot topic of extensive research. [0003] Although the nonlinear optical properties of semiconductor nanocrystals such as ZnSe and CdSe are greater than those of bulk materials, they still cannot meet the needs of the field of nonlinear optics. Therefore, with the emergence of graphene and its excellent optoelectronic properties, scientists began to Composite graphene with ZnSe or CdSe to ...

Claims

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Application Information

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IPC IPC(8): C01B19/04C01B32/19G02F1/355B82Y30/00B82Y40/00
CPCC01B19/007C01B32/19G02F1/3556B82Y30/00B82Y40/00C01P2004/84
Inventor 朱宝华王芳芳李鹏超顾玉宗
Owner HENAN UNIVERSITY
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