Method for preparing luminescent adjustable nitrogen-doped carbon quantum dots by one-step process

A technology of nitrogen-doped carbon quantum and nitrogen-carbon quantum, applied in the field of organic nanomaterial preparation, can solve the problems of complex process, long time-consuming, difficult operation, etc., and achieve the effect of simple process, fine and controllable size, and easy functionalization

Inactive Publication Date: 2015-02-18
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In recent years, there have been reports on nitrogen doping to regulate luminescence, see: Guo X, Wang C F, Yu Z Y, et al. Chemica

Method used

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  • Method for preparing luminescent adjustable nitrogen-doped carbon quantum dots by one-step process
  • Method for preparing luminescent adjustable nitrogen-doped carbon quantum dots by one-step process
  • Method for preparing luminescent adjustable nitrogen-doped carbon quantum dots by one-step process

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Embodiment 1

[0022] A method for preparing nitrogen-doped carbon quantum dots with adjustable luminescence in one step, the chemical formula of the nitrogen-doped carbon quantum dots is N-CNDs, and the specific steps are as follows:

[0023] 1) 1.5g octadecylamine [(C 18 h 38 N)] was added to 15mL of octadecene, fully circulated with nitrogen to remove the air in the bottle, heated to 100°C and magnetically stirred until completely dissolved and uniformly mixed to obtain solution A;

[0024] 2) Heat solution A to 230°C and quickly add 1 g of citric acid monohydrate (C 6 h 8 o 7 ·H 2 (0), the solution was changed from colorless to light yellow, and the reaction was 35min, and the solution was changed from light yellow to brown, and finally dark reddish-brown reaction solution B was obtained;

[0025] 3) Extract 2mL of the reaction solution B, mix them with 2mL methanol evenly, cool to room temperature and centrifuge, wash the precipitate with double volume methanol and centrifuge 3 tim...

Embodiment 2

[0027] A method for preparing nitrogen-doped carbon quantum dots with adjustable luminescence in one step, the chemical formula of the nitrogen-doped carbon quantum dots is N-CNDs, and the specific steps are as follows:

[0028] 1) 1.5g octadecylamine [(C 18 h 38 N)] was added to 15mL of octadecene, fully circulated with nitrogen to remove the air in the bottle, heated to 110°C and magnetically stirred until completely dissolved and uniformly mixed to obtain solution A;

[0029] 2) Heat solution A to 270°C and quickly add 1 g of citric acid monohydrate (C 6 h 8 o 7 ·H 2 (0), the solution is changed from colorless to light yellow, reacted for 15min, and the solution turned from light yellow to brown, and finally obtained dark reddish-brown reaction solution B;

[0030] 3) Extract 2mL of the reaction solution B, mix them with 2mL methanol evenly, cool to room temperature and centrifuge, wash the precipitate with double volume methanol and centrifuge 3 times, the centrifugat...

Embodiment 3

[0032] A method for preparing nitrogen-doped carbon quantum dots with adjustable luminescence in one step, the chemical formula of the nitrogen-doped carbon quantum dots is N-CNDs, and the specific steps are as follows:

[0033] 1) 1.5g octadecylamine [(C 18 h 38 N)] was added to 15mL of octadecene, fully circulated with nitrogen to remove the air in the bottle, heated to 120°C and magnetically stirred until completely dissolved and uniformly mixed to obtain solution A;

[0034] 2) Heat solution A to 300°C and quickly add 1 g of citric acid monohydrate (C 6 h 8 o 7 ·H 2 (0), the solution is changed from colorless to light yellow, and reacted for 5min, the solution is turned from light yellow to brown, and finally dark reddish brown reaction solution B is obtained;

[0035] 3) Extract 2mL of the reaction solution B, mix them with 2mL methanol evenly, cool to room temperature and centrifuge, wash the precipitate with double volume methanol and centrifuge 3 times, the centri...

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Abstract

The invention discloses a method for preparing luminescent adjustable nitrogen-doped carbon quantum dots by one-step process. The method comprises the following steps: adding octadecylamine into octadecene, and heating and stirring until octadecylamine is completely dissolved to obtain a solution A; heating the solution A, quickly adding citric acid monohydrate for reaction to obtain a deep red brown reaction solution B; uniformly mixing the reaction solution B with methanol, cooling to the room temperature, centrifuging, and washing to obtain the purified nitrogen-doped carbon quantum dots. The method has the advantages that the method is simple in process and convenient to perform; the prepared nitrogen-doped carbon quantum dots are luminescent, adjustable and regularly changed in grain size, have the characteristics of no toxicity, simple functionalization, high and stable fluorescence intensity, controllable fine size and the like, are applied to bioimaging, sensing and probe technologies and photoelectric devices such as solar cells, luminescent devices and field effect transistors, can be dissolved in an organic solvent such as methylbenzene, and are of important significance on development of novel organic nanomaterials and application to the photoelectric devices.

Description

【Technical field】 [0001] The invention relates to the field of preparation of organic nanometer materials, in particular to a method for preparing nitrogen-doped carbon quantum dots with adjustable luminescence by a one-step method. 【Background technique】 [0002] Since their discovery in 2004, carbon quantum dots have been used in biological imaging, sensing and probe technology, as well as solar cells, light-emitting devices, field effect Optoelectronic devices such as transistors. Citric acid with high purity and cheap raw materials is one of the most important carbon sources for the preparation of carbon dots. The reaction mechanism mainly includes high-temperature pyrolysis and high-temperature carbonization; the former forms ammonium salts through low-temperature reactions of citric acid and other compounds or high-temperature reactions to form amides Bond molecular precursors, and then form carbon dots through high-temperature pyrolysis or polynucleation; the latter ...

Claims

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Application Information

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IPC IPC(8): C09K11/65
Inventor 李岚李霖霖赵相国徐建萍张晓松刘泽明张旭光王昶石鑫
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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