A kind of preparation method of size-controllable cadmium sulfide quantum dots

A technology of cadmium sulfide and quantum dots, applied in the directions of cadmium sulfide, chemical instruments and methods, luminescent materials, etc., can solve problems such as complex methods, and achieve the effects of simplifying the preparation process, good electrochemical performance, and good monodispersity

Inactive Publication Date: 2016-04-13
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the patent number of 200810033595.5 synthesized cadmium sulfide quanta with controllable size under normal temperature and pressure. The synthesis was carried out in multiple steps and the method was complicated.

Method used

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  • A kind of preparation method of size-controllable cadmium sulfide quantum dots
  • A kind of preparation method of size-controllable cadmium sulfide quantum dots
  • A kind of preparation method of size-controllable cadmium sulfide quantum dots

Examples

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Effect test

Embodiment 1

[0025] Example 1 A preparation method of size-controllable cadmium sulfide quantum dots, comprising the following steps:

[0026] (1) Add cadmium nitrate tetrahydrate and sublimed sulfur into 5mL oleylamine solution in a molar ratio of 1, and mix well to obtain a mixed solution.

[0027] The mixed solution was stirred at room temperature and flowed with inert gas argon at a flow rate of 30 mL / min for 10 min, then heated to 130 °C at a rate of 10 °C / min under the protection of inert gas argon, and kept at 130 °C for 30 min , a yellow transparent mixed solution was obtained.

[0028] The yellow transparent mixed solution was heated to 180° C. at a rate of 10° C. / min under the protection of inert gas argon, then kept at this temperature for 30 minutes and then naturally cooled to room temperature to obtain a cooling solution.

[0029] (2) Add 15mL of absolute ethanol to the cooling solution, and a yellow precipitate precipitates out. After ultrasonic centrifugation at an ultra...

Embodiment 2

[0031] Example 2 A preparation method of size-controllable cadmium sulfide quantum dots, comprising the following steps:

[0032] (1) Add cadmium nitrate tetrahydrate and sublimed sulfur into 15mL oleylamine solution at a molar ratio of 6, and mix well to obtain a mixed solution.

[0033] The mixed solution was stirred at room temperature and flowed with inert gas argon at a flow rate of 60 mL / min for 15 min, then heated to 120 °C at a rate of 5 °C / min under the protection of inert gas argon, and kept at 120 °C for 15 min , a yellow transparent mixed solution was obtained.

[0034] The yellow transparent mixed solution was heated to 160° C. at a rate of 5° C. / min under the protection of inert gas argon, then kept at this temperature for 20 minutes and then naturally cooled to room temperature to obtain a cooling solution.

[0035](2) Add 10mL of absolute ethanol to the cooling solution, and a yellow precipitate precipitates out. After ultrasonic centrifugation at an ultraso...

Embodiment 3

[0037] Example 3 A preparation method of size-controllable cadmium sulfide quantum dots, comprising the following steps:

[0038] (1) Add cadmium nitrate tetrahydrate and sublimed sulfur into 10mL oleylamine solution at a molar ratio of 3, and mix well to obtain a mixed solution.

[0039] The mixed solution was stirred at room temperature and passed through the inert gas argon at a flow rate of 40 mL / min for 12 min, then heated to 140 °C at a rate of 20 °C / min under the protection of the inert gas argon, and kept at 140 °C for 60 min , a yellow transparent mixed solution was obtained.

[0040] The yellow transparent mixed solution was heated to 290° C. at a rate of 20° C. / min under the protection of inert gas argon, then kept at this temperature for 60 minutes and then naturally cooled to room temperature to obtain a cooling solution.

[0041] (2) Add 20mL of absolute ethanol to the cooling solution, and a yellow precipitate precipitates out. After ultrasonic centrifugation...

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Abstract

The invention relates to a method for preparing cadmium sulfide quantum dots with controllable size. The method comprises the following steps: (1) adding cadmium nitrate tetrahydrate and sublimed sulfur into an oleylamine solution, and mixing uniformly to obtain a mixed solution; The mixed solution was stirred at room temperature and fed with inert gas argon, then heated under the protection of inert gas argon, and kept at this temperature to obtain a yellow transparent mixed solution; the yellow transparent mixed solution was heated under the inert gas Heating under the protection of argon, then naturally cooling to room temperature after being kept warm at this temperature, to obtain a cooling solution; (2) adding absolute ethanol to the cooling solution has a yellow precipitate, and after ultrasonic centrifugation, a yellow precipitate and a reaction mother liquor are obtained; The precipitate is washed and centrifuged with a mixture of absolute ethanol and n-hexane, and vacuum-dried to constant weight to obtain yellow powdery cadmium sulfide quantum dots of different sizes. The method of the invention is simple, low in cost and less in environmental pollution.

Description

technical field [0001] The invention relates to the technical field of preparing semiconductor quantum dots, in particular to a method for preparing size-controllable cadmium sulfide quantum dots. Background technique [0002] Since the size of quantum dots is smaller than the wavelength of electrons, the energy of their carriers is quantized, making quantum dots have excellent optical, electrical and magnetic properties. Semiconductor quantum dots have attracted widespread attention in recent years due to their unique optical and electrical properties, and have been widely used in different scientific and technological fields such as bioluminescence labels, biosensors, bioimaging, bioprobes, and solar cells. [0003] II-VI semiconductors, especially CdS, CdSe, and CdTe, have also been widely studied, and their emission in the visible range can be easily changed by simply adjusting the particle size and preparation method. Among these materials, CdS is a very important stra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G11/02C09K11/56
Inventor 康燕佘厚德魏娟娟万新磊雷自强
Owner NORTHWEST NORMAL UNIVERSITY
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