Simple and quick preparation method of nitrogen-doped carbon quantum dots

Abstract

The invention provides a simple and quick preparation method of nitrogen-doped carbon quantum dots. The method comprises the following step: performing high-temperature treatment on an alcohol amine organic matter or a mixture of the alcohol amine organic matter and an oxidant. According to the method, raw materials are conventional materials, that is to say, the process cost is low and the method conditions are easily met; the alcohol amine organic matter is directly pyrolyzed to obtain the nitrogen-doped carbon quantum dots, and the process is very simple and quick; the method is short in process time, high in yield, very simple to operate, low in cost, capable of producing the nitrogen-doped carbon quantum dots on a large scale and obtaining the size-controllable nitrogen-doped carbon quantum dots, and suitable for commercialized production.

Description

technical field The invention relates to the technical field of nanometer materials, in particular to a simple and rapid preparation method of nitrogen-doped carbon quantum dots. Background technique Recently, fluorescent carbon quantum dots have attracted widespread attention in the scientific community due to their tunable surface functional groups, excellent optical properties, chemical stability, and low toxicity. Wide application prospects. The synthesis of carbon quantum dots can generally be mainly divided into two categories: "top-down" and "bottom-up" approaches. The "top-down" method of preparing carbon quantum dots often has the following disadvantages: special equipment is required, low yield, damage to the graphene lattice, and non-selective chemical cutting is often unable to control the size and size of carbon quantum dots. shape. The "bottom-up" method can obtain carbon quantum dots with controllable size and superior performance. The "bottom-up" method ...

AI Technical Summary

Problems solved by technology

The "top-down" method of preparing carbon quantum dots often has the following disadvantages: special equipment is required, low yield, damage to the graphene lattice, and non-selective chemical cutting is often unable to control the size and size of carbon quantum dots. appearance

However, these bottom-up methods often have the disadvantages of requiring complex synthetic processes, requiring a large amount of acid and alkali, requiring a relatively long period of time, and relatively expensive organic precursors.

Microwave-assisted pyrolysis method to prepare carbon quantum dots can quickly prepare carbon quantum dots, but it often requires water as a solvent and is not suitable for large-scale production

Y Q Dong et al. published "Blue luminescent graphene quantum dots and grapheme oxide prepared by tuning the carbonization degree of citric acid" in Carbon magazine in 2012, and studied the method of directly obtaining blue fluorescent carbon quantum dots by pyrolyzing citric acid at high temperature, but His product yield is relatively low and carbon quantum dots need alkali treatment and other follow-up processing work

M J Krysmann et al. published Formation Mechanism of Carbogenic Nanoparticles with Dual Photoluminescence Emission on JACS in 2012. They studied the process of obtaining blue fluorescent carbon quantum dots through direct high-temperature pyrolysis of a mixture of citric acid and ethanolamine, and it took a long time. , the reaction of the two substances is often not complete, and the yield is not high

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