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Carbon nanotube/cadmium selenide quantum dot nano composite material and preparation method thereof

A technology of nanocomposite materials and nano quantum dots, which is applied in nanostructure manufacturing, chemical instruments and methods, nanotechnology, etc., can solve problems such as hazards, and achieve the effects of reducing complexity, reducing environmental and human hazards, and reducing hazards

Inactive Publication Date: 2010-10-20
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these processes, most of them require high-temperature, high-air-tightness devices and some special devices, and the raw materials and reagents prepared are also more harmful to the human body.

Method used

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  • Carbon nanotube/cadmium selenide quantum dot nano composite material and preparation method thereof
  • Carbon nanotube/cadmium selenide quantum dot nano composite material and preparation method thereof
  • Carbon nanotube/cadmium selenide quantum dot nano composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The preparation of embodiment 1Se precursor solution

[0027] Weigh 1.0mmol of Se powder (total 0.0790g) and 50ml of liquid paraffin into a 250ml three-neck flask, and slowly heat to 220°C under the conditions of rapid and continuous stirring and a methyl silicone oil bath (the heating rate is 5-15°C / min) A homogeneous solution is formed, that is, the precursor solution of Se. The solution was initially bright yellow and gradually turned orange-yellow.

Embodiment 2

[0028] The preparation of embodiment 2CdO precursor solution

[0029] Weigh 10mmol of CdO powder (total 1.2814g) into a 250ml three-neck flask, add 9.6ml of oleic acid and 40ml of liquid paraffin successively under continuous stirring, and heat the oil bath to 150°C to gradually dissolve the dark red CdO powder And form a dark red homogeneous solution, namely the precursor solution of CdO.

Embodiment 3

[0031] (1) Add 80 mg of multi-walled carbon nanotubes (MWCNTs) that have not been treated with concentrated acid to the Se precursor solution (containing 1.0 mmol Se precursor) prepared in Example 1 at 220 ° C, rapidly and continuously stir and keep warm for one After 1 hour, the reaction system turned into a uniform deep dark red solution.

[0032] (2) Use a pipette to take out 5ml of the CdO precursor solution prepared in Example 2 (precursor containing about 1.0mmol CdO), quickly inject it into the mixture obtained in step (1) and keep warm at 220-230°C The reaction was stirred for 15 min.

[0033] (3) Remove the heat source and stop stirring, cool to room temperature (15-25°C), add methanol to promote the precipitation of carbon nanotube / cadmium selenide quantum dot nanocomposite (MWCNT / CdSe), centrifuge to separate the precipitate, and wash with ethanol 3 to 5 times, vacuum dry at 50°C.

[0034] The TEM picture and the high-resolution TEM picture of the obtained product...

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Abstract

The invention belongs to the technical field of nano composite materials and discloses a carbon nanotube / cadmium selenide quantum dot nano composite material and a preparation method thereof. In the carbon nanotube / cadmium selenide quantum dot nano composite material, carbon nanotubes are used as frameworks, and the surfaces of the carbon nanotubes are coated with the cadmium selenide quantum dots. The preparation method comprises: (1) mixing multi-wall carbon nanotubes with Se precursor solution which is heated to 200 to 240 DEG C, stirring the mixture and keeping the temperature for performing a reaction for 15 to 90 minutes, wherein the amount of the multi-wall nanotubes to that of the Se is 60-90g / mol; (2) adding CdO precursor solution, keeping the temperature and continuously stirring the solution for 10 to 30 minutes, wherein the molar ratio of the Se to the CdO is 1:0.95-1.05; and (3) cooling the solution and performing precipitation by using an alcohol. The preparation method is simple in operation and suitable for industrial production and has the slightest harm to environment and human bodies; and the obtained nano composite material has a high dispersibility in solventssuch as ethanol and chloroform and high fluorescence.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and relates to a carbon nanotube / cadmium selenide quantum dot (CNT / CdSe) nanocomposite material and a preparation method thereof. Background technique [0002] Carbon nanotubes have been a research hotspot at home and abroad because of their excellent and unique mechanical, thermal and electrical properties. In recent years, people have coated nano-semiconductor materials on the surface of carbon nanotubes to optimize the performance of carbon nanotubes and broaden their application fields. Studies have shown that a layer of semiconductor nanocrystals is evenly coated on the surface of carbon nanotubes. When the grain size reaches the nanometer level, it has many excellent characteristics such as quantum size effect and easy photoexcitation. This composite material is expected to be used in optical fiber communication. , light-emitting diodes and photovoltaic cells and other fiel...

Claims

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Application Information

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IPC IPC(8): C09K11/88B82B3/00
Inventor 吴惠霞王俊杨仕平
Owner SHANGHAI NORMAL UNIVERSITY
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