Method for preparing fluorescent carbon quantum dots based on metformin as precursor

A technology of carbon quantum dots and metformin is applied in the field of preparation of fluorescent carbon quantum dots, which can solve the problems of carbon quantum dots being difficult to widely apply and analyze, and achieve the effects of simple and convenient operation method, high yield and high fluorescence intensity.

Inactive Publication Date: 2020-09-01
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology

Most of the previous researchers used natural organic substances to synthesize carbon quantum dots. Although the source of raw materials is green and cheap, it is difficult to analyze the mechanism and performance of the final product from the structural level.
As a result, carbon quantum dots are difficult to be widely used to a certain extent.

Method used

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  • Method for preparing fluorescent carbon quantum dots based on metformin as precursor
  • Method for preparing fluorescent carbon quantum dots based on metformin as precursor
  • Method for preparing fluorescent carbon quantum dots based on metformin as precursor

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Embodiment 1

[0023] Example 1: This embodiment records a method for preparing fluorescent carbon quantum dots using metformin as a precursor. The method is a hydrothermal method, and the specific preparation steps are as follows:

[0024] Step 1. Weigh 2mmol of metformin hydrochloride and 1 mmol of dithiodibenzoic acid respectively, the molar ratio is 2:1, place them in 10mmol of acetic acid, fully stir, and transfer to a polytetrafluoroethylene-lined hydrothermal reaction kettle , reacted at 180 °C for 10 h, and cooled to room temperature.

[0025] In the polytetrafluoroethylene-lined hydrothermal reactor, the polytetrafluoroethylene lining has the characteristics of high temperature resistance, high pressure resistance, and acid and alkali resistance. Due to the use of hydrothermal method for preparation, the solvent is heated and vaporized during the hydrothermal process, resulting in an increase in the internal temperature of the reactor and a rise in air pressure, and acidic liquid ac...

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Abstract

The invention relates to a method for preparing fluorescent carbon quantum dots by taking metformin as a precursor. The method comprises the following steps: step 1, carrying out hydrothermal reactionon metformin hydrochloride and dithiodibenzoic acid to generate a carbon quantum dot stock solution; step 2, filtering out impurities from the carbon quantum dot stock solution to form filtrate; step3, after the filtrate is subjected to heating and magnetic stirring treatment, attaching carbon quantum dots in the filtrate to a first filter membrane through the first filter membrane; and step 4,drying the first filter membrane to obtain carbon quantum dot powder. The purity of the final product is higher than that of fluorescent carbon dots with natural organic matter as a carbon source, thereaction process and structure can be analyzed, no toxic reagent is added, the operation method is simple and convenient, and finally the fluorescent carbon quantum dots with high fluorescence emission intensity can be prepared on a large scale.

Description

technical field [0001] The invention belongs to the field of preparation of fluorescent carbon quantum dots, in particular to a method for preparing fluorescent carbon quantum dots based on metformin as a precursor. Background technique [0002] It has been nearly 16 years since fluorescent carbon quantum dots were first discovered in 2004 and first named in 2006. Due to the wide range of sources of raw materials, abundant functional groups on the surface, and the diversification of synthetic pathways, fluorescent carbon quantum dots have begun to show more and more important positions in the fields of semiconductor luminescence, photo / electrocatalysis, biological imaging, and drug delivery. Most of the previous researchers used natural organic substances to synthesize carbon quantum dots. Although the source of raw materials is green and cheap, it is difficult to analyze the mechanism and performance of the final product from the structural level. As a result, carbon quant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15
CPCC09K11/65B82Y20/00B82Y40/00C01B32/15C01P2004/04C01P2004/64
Inventor 李炳生于立冬李丽
Owner NORTHEAST NORMAL UNIVERSITY
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