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Preparation method of bromine-doped graphene quantum dots by liquid phase exfoliation

A graphene quantum dot, liquid phase exfoliation technology, applied to graphene, nano-carbon and other directions, can solve the problems of cumbersome preparation steps, high cost of raw materials, low yield of quantum dots, etc., and achieves easy availability of raw materials, simple preparation steps, The effect of technological route innovation

Active Publication Date: 2019-04-26
KUNMING INST OF PHYSICS
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Problems solved by technology

[0004] What the present invention is to solve is the existing problems of cumbersome preparation steps of graphene quantum dots, high cost of raw materials and low yield of quantum dots, etc., and provides a method using cheap liquid paraffin and tribromomethane as raw materials, using ultrasonic liquid phase exfoliation method Preparation method of bromine-doped graphene quantum dot liquid phase exfoliation for preparing bromine-doped graphene quantum dot

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  • Preparation method of bromine-doped graphene quantum dots by liquid phase exfoliation
  • Preparation method of bromine-doped graphene quantum dots by liquid phase exfoliation
  • Preparation method of bromine-doped graphene quantum dots by liquid phase exfoliation

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Embodiment 1

[0018] Embodiment 1: a kind of bromine-doped graphene quantum dot liquid-phase exfoliation preparation method, comprises flame method and ultrasonic liquid-phase exfoliation two steps, and specific method is as follows:

[0019] 1) Flame method: After mixing 5 g of liquid paraffin and 0.8 g of tribromomethane, pour it into an alcohol lamp, ignite the mixed liquid with a cotton wick, then place a glass slide above the flame, and keep moving the position of the slide to make it heated Uniform and not easy to break, and collect the black substance on the glass slide and put it into the sample bottle;

[0020] 2) Ultrasonic liquid phase stripping: take 0.25 g of the black substance obtained in step 1), add 50 ml of analytically pure NMP, and put it into an ultrasonic machine for 5 h; then pour the liquid into a centrifuge tube and put it into a centrifuge for Centrifuge at a speed of 4000 r / h for 20 min, collect the supernatant clear liquid after centrifugation, and obtain a bromi...

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Abstract

The invention provides a liquid-phase-stripping preparation method for bromine-doped graphene quantum dots and relates to preparation methods for graphene quantum dots. According to the liquid-phase-stripping preparation method for the bromine-doped graphene quantum dots, the bromine-doped graphene quantum dots are mainly prepared from low-price liquid paraffin and bromoform, which serve as raw materials, by using an ultrasonic liquid-phase stripping method. The liquid-phase-stripping preparation method for the bromine-doped graphene quantum dots, provided by the invention, is characterized by comprising two steps, i.e., carrying out a flame method and carrying out ultrasonic liquid-phase stripping. According to the liquid-phase-stripping preparation method for the bromine-doped graphene quantum dots, the requirements on equipment and reaction conditions are not high, and surfaces of the prepared quantum dots contain more oxygen-containing functional groups, so that the quantum dots are easily soluble in water and can also be dissolved in a variety of organic solvents. The bromine-doped graphene quantum dots are added with bromine-containing functional groups and are subjected to surface modification, so that an n-type doped system is formed; the zero-bandgap structure of graphene is opened, and an additional bromine atomic energy level is increased, so that the transition of electrons of an outer layer has different manners, and the photoelectric properties of the graphene quantum dots are effectively changed.

Description

technical field [0001] The invention relates to a method for preparing graphene quantum dots; mainly using low-cost liquid paraffin and tribromomethane as raw materials, and using an ultrasonic liquid phase stripping method to prepare bromine-doped graphene quantum dot liquid phase bromine-doped graphene quantum dots Strip preparation method. Background technique [0002] In recent years, graphene quantum dots have attracted widespread attention due to their excellent physical and chemical properties and application prospects in optoelectronic devices and molecular sensors, and have become a popular material in the fields of condensed matter physics and material science. [0003] The main way for graphene to realize its band gap and photoelectric performance modulation is doping. The band gap of graphene quantum dots can be effectively modulated by heteroatom doping, thereby optimizing the photoelectric performance. Researchers have carried out a lot of research work on gra...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01P2002/82C01P2002/84C01P2004/04C01P2004/80C01P2006/60
Inventor 唐利斌姬荣斌项金钟李尧袁绶章魏虹陈雪梅铁筱滢左大凡王燕康蓉韩福忠
Owner KUNMING INST OF PHYSICS
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