Preparation method of functionalized graphene quantum dots

Abstract

The invention discloses a preparation method of functionalized graphene quantum dots. A strategy of preparing hydroxyl functionalized graphene quantum dots in one step by using a mechanical force chemical reaction is adopted. Multi-walled carbon nanotubes and potassium hydroxide are selected as reaction raw materials, a high-energy ball milling method is utilized to enable the multi-walled carbonnanotubes and potassium hydroxide to be subjected to a mechanical chemical reaction in the ball milling process, and in cooperation with the added potassium hydroxide, during ball milling, ionic bondscan be broken to generate hydroxyl radicals, so that carbon atomic nuclei are attacked, and the carbon nanotubes are promoted to be stripped into graphene quantum dots, and the carbon nanotubes are combined to the quantum dots to form hydroxylated graphene quantum dots, and the hydroxylated graphene quantum dots are prepared in one step; the method is green, safe, simple, convenient and easy to operate, the hydroxyl-functionalized graphene quantum dots can be prepared in one step at normal temperature and normal pressure, and the prepared graphene quantum dots are uniform in size, controllable in functional group, good in biocompatibility, high in yield and good in repeatability, and the fluorescence characteristic, the antioxidant activity and the electrochemical activity are good.

Description

technical field [0001] The invention specifically relates to the technical field of graphene quantum dots, in particular to a preparation method of functionalized graphene quantum dots. Background technique [0002] The existing preparation methods of graphene quantum dots are mainly divided into two categories: bottom-up method and top-down method. The bottom-up method refers to the synthesis of graphene quantum dots with different sizes and functional groups from small molecular compounds by hydrothermal and solvothermal methods. The advantage is that the structure of the prepared graphene quantum dots is relatively tunable and controllable through the selection of the precursors. However, the graphene quantum dots prepared by the bottom-up method often contain some small molecular compounds that are not fully reacted, and it is difficult to purify them completely. The top-down method uses strong oxidant oxidative exfoliation, mechanical exfoliation and other methods to ...

AI Technical Summary

Problems solved by technology

However, oxidative peeling often requires the addition of a strong oxidant, the reaction will generate a lot of heat, and the operation process is dangerous; the use of a strong oxidant will cause a lot of pollution; the reaction product has many types of oxygen-containing functional groups and is uncontrollable.

Mechanical exfoliation is often too low yield and does not allow simultaneous functionalization of quantum dots

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