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Method for preparing carbon quantum dots

A technology of carbon quantum dots and dosage, applied in the field of preparation of carbon quantum dots, can solve the problems of complex operation, cumbersome process and expensive equipment

Inactive Publication Date: 2013-05-08
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Since researchers accidentally discovered carbon quantum dots in the process of purifying carbon nanotubes in 2004, the preparation methods of carbon quantum dots have been greatly developed, such as arc method, laser method, microwave method, etc., but these methods are often complicated to operate , the equipment is relatively expensive, the process is cumbersome, the cost is high, and the yield is low, which greatly limits the application and development of carbon quantum dots

Method used

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  • Method for preparing carbon quantum dots
  • Method for preparing carbon quantum dots
  • Method for preparing carbon quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Add 0.25g of silk into the hydrothermal reaction kettle, then add 10ml of water and 2.5ml of 30% hydrogen peroxide, then seal the reaction kettle and heat up to 200 o After reacting in C for 24 hours and cooling to room temperature, an aqueous dispersion of carbon quantum dots can be obtained, which exhibits strong blue fluorescence under ultraviolet light.

Embodiment 2

[0021] Add 0.25g of silk into the hydrothermal reaction kettle, then add 10ml of water and 1.5ml of 30% hydrogen peroxide, then seal the reaction kettle and heat up to 220 o After reacting in C for 24 hours and cooling to room temperature, an aqueous dispersion of carbon quantum dots can be obtained, which exhibits blue fluorescence under ultraviolet light.

Embodiment 3

[0023] The chitosan of 0.25g is joined in the hydrothermal reaction kettle, then the water of 10ml and the 30% hydrogen peroxide of 2ml are added thereinto, then the reaction kettle is sealed, and the temperature is raised to 250 o After reacting in C for 12 hours and cooling to room temperature, an aqueous dispersion of carbon quantum dots can be obtained, which exhibits strong blue fluorescence under ultraviolet light.

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Abstract

The invention relates to a method for preparing carbon quantum dots. The method is mainly characterized by comprising the following steps of: adding hydrogen peroxide in natural compounds such as saccharides or proteins; and then, performing direct hydro-thermal treatment to obtain the carbon quantum dots with strong fluorescence. The shape of the natural compounds after hydro-thermal treatment can be greatly changed due to addition of hydrogen peroxide, so that the carbon quantum dots with strong fluorescence are formed. The method is wide in material source, very cheap in price, simple and convenient to operate, simple in post treatment and environment-friendly, and the yield of the carbon quantum dots is high. The property of the carbon quantum dots can be conveniently adjusted by content of added hydrogen peroxide, so that the method has large-scale preparation potential and a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of carbon quantum dot preparation, and in particular relates to a method for preparing carbon quantum dots. Background technique [0002] Quantum dots are a new type of quasi-zero-dimensional nanomaterials. This small size endows them with strong size confinement effects and edge effects, which will produce strong fluorescence. They are widely used in materials science, electronic devices, biochemistry and other fields. It has broad application prospects. The earliest quantum dots are generally some transition metal sulfides or tellurides, such as cadmium sulfide, cadmium telluride, etc., but because these transition metals have certain toxicity, and their synthesis conditions are relatively high, and the process is relatively complicated, these Defects greatly limit the applications of quantum dots. Therefore, large-scale synthesis of quantum dots with controllable properties using a simple and environmen...

Claims

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Application Information

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IPC IPC(8): C01B31/02C09K11/65C01B32/15
Inventor 张泽汇徐胜杰武培怡
Owner FUDAN UNIV
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