Preparation method of oxygen and chlorine co-doped graphene quantum dots

A graphene quantum dot and co-doping technology is applied in the field of preparation of oxygen and chlorine co-doped graphene quantum dots, and can solve the problems of graphene quantum dots such as low effective energy level of electronic transition, poor luminescence and luminescence modulation performance, etc. , to achieve the effects of good luminous properties and water solubility, wide application value, and environmental protection of the preparation process

Inactive Publication Date: 2013-10-23
YUNNAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] What the present invention aims to solve is the problem that the graphene quantum dots produced by the current hydrothermal preparation method have a low effective energy level for the electronic transition, and their luminescence and light modulation performance are poor. It provides a kind of oxygen and chlorine co-doped graphene quantum dot Hydrothermal synthesis preparation method

Method used

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  • Preparation method of oxygen and chlorine co-doped graphene quantum dots
  • Preparation method of oxygen and chlorine co-doped graphene quantum dots
  • Preparation method of oxygen and chlorine co-doped graphene quantum dots

Examples

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Embodiment 1

[0034] Example 1: Weigh 0.5 g of fructose, add 39.5 mL of deionized water, and stir to dissolve the sugar. Add 0.5 mL of hydrochloric acid (32%, wt) to the sugar solution and stir well. The reaction solution was heated at 170° C. for 4 hours under hydrothermal conditions. Cool the reaction solution to room temperature, perform dialysis purification with a dialysis bag with a molecular weight of 1000, collect samples, and obtain oxygen and chlorine co-doped graphene quantum dots with an average size of 5.4 nm.

Embodiment 2

[0035] Example 2: Weigh 1.5 g of glucose, add 38.5 mL of deionized water, and stir to dissolve the glucose. Add 0.2 mL of hydrochloric acid (32%, wt) to the glucose solution and stir well. The reaction solution was heated at 180°C under hydrothermal conditions for 2 hours. Cool the reaction solution to room temperature, perform dialysis purification with a dialysis bag with a molecular weight of 3000, collect samples, and obtain oxygen and chlorine co-doped graphene quantum dots with an average size of 7.2 nm.

Embodiment 3

[0036] Example 3: Weigh 0.3 g of sucrose, add 39.7 mL of deionized water, and stir to dissolve the sucrose. Add 0.6 mL of hydrochloric acid (32%, wt) to the sucrose solution and stir well. The reaction solution was heated at 190° C. for 3 hours under hydrothermal conditions. Cool the reaction solution to room temperature, perform dialysis purification with a dialysis bag with a molecular weight of 1000, collect samples, and obtain oxygen and chlorine co-doped graphene quantum dots with an average size of 4.9 nm.

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Abstract

The invention discloses a preparation method of oxygen and chlorine co-doped graphene quantum dots, and relates to hydro-thermal preparation technology of the oxygen and chlorine co-doped graphene quantum dots. The hydro-thermal preparation technology of the oxygen and chlorine co-doped graphene quantum dots is characterized in that: under hydro-thermal conditions and hydrochloric acid catalysis conditions, a saccharide is used as a carbon source and an oxygen doping source, hydrochloric acid is used as a chlorine doping source, and water-soluble oxygen and chlorine co-doped graphene quantum dots are produced by water molecule-eliminating polymerization of saccharide molecules and the hydrochloric acid. The hydro-thermal preparation technology relates to simultaneous introduction of elements of oxygen and chlorine into the graphene quantum dots, so that electron transition effective energy levels in the graphene quantum dots can be increased, and furthermore the prepared oxygen and chlorine co-doped graphene quantum dots have more excellent luminescence and luminescence modulation performances.

Description

technical field [0001] The invention relates to a preparation method of oxygen and chlorine co-doped graphene quantum dots, especially using cheap sugar and hydrochloric acid as raw materials, using a simple and environmentally friendly process to prepare oxygen with good water solubility, good monodispersity, and luminescent properties. , Chlorine co-doped graphene quantum dots method. Background technique [0002] Due to their special optical properties, electronic properties, chemical stability and spin properties, graphene quantum dots (GQDs) have become a hotspot in many research fields of materials. The preparation techniques of graphene quantum dots are diverse, including electron beam lithography, chemical synthesis, electrochemical preparation, graphene oxide (GO) reduction, polycyclic aromatic hydrocarbon pyrolysis, etc. [0003] At present, graphene quantum dots have not been widely used in the field of optoelectronics. The main reason is that there is still a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 李学铭唐利斌杨雯杨培志
Owner YUNNAN NORMAL UNIV
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