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Preparation method of cadmium sulfide quantum dots with controllable sizes

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 complicated methods, and achieve the effects of simplifying the preparation process, high fluorescence intensity, and reducing the difficulty of operation

Inactive Publication Date: 2014-07-23
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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  • Preparation method of cadmium sulfide quantum dots with controllable sizes
  • Preparation method of cadmium sulfide quantum dots with controllable sizes
  • Preparation method of cadmium sulfide quantum dots with controllable sizes

Examples

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Comparison scheme
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 u...

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 ult...

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 centrifuga...

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Abstract

The invention relates to a preparation method of cadmium sulfide quantum dots with controllable size. The preparation method comprises the following steps: (1) adding cadmium nitrate tetrahydrate and sublimed sulfur to an oleylamine solution, and uniformly mixing so as to obtain a mixed solution; stirring the mixed solution at a room temperature, feeding inert gas argon, heating under the protection of the inert gas argon, and carrying out heat preservation at the temperature so as to obtain a yellow transparent mixed solution; heating the yellow transparent mixed solution in the presence of the inert gas argon, then carrying out heat preservation at the temperature, and naturally cooling to a room temperature so as to obtain a cooling solution; (2) adding absolute ethyl alcohol to the cooling solution so as to separate out yellow precipitates, and carrying out supersonic centrifugation so as to obtain a yellow precipitates and reaction mother liquor; centrifugally washing the precipitates by using an absolute ethyl alcohol and normal hexane mixed solution, and drying in vacuum until the weight is constant so as to obtain yellow powdery cadmium sulfide quantum dots with different sizes. The preparation method is simple, relatively low in cost and less in environmental pollution.

Description

Technical field [0001] The present invention involves the preparation technology field of semiconductor quantity points, especially the preparation method of a controllable cadmium sulfide quantum dot. Background technique [0002] Because the size of the quantum dot is less than the electron wavelength, the energy of the carrier is quantized, so that quantum dots have excellent optics, electrical and magnetic properties.Different scientific and technological fields such as semiconductor quantum dots have been widely used in biological fluorescent labels, biosensors, biological imaging, biological probes, and solar cells because of their unique optical and electrical nature in recent years. [0003] The Ⅱ-半 semiconductor, especially CDS, CDSE, and CDTE have also been widely studied. It can easily change the launch in the visible light through simply adjusting the size and preparation method of the particles.Among these materials, CDS is a very important band gap semiconductor nan...

Claims

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Application Information

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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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