A method for preparing nitrogen-doped carbon quantum dots by solid-state pyrolysis and its application

A technology of carbon quantum dots and nitrogen doping, which is applied in the field of preparing nitrogen-doped carbon quantum dots by solid-state pyrolysis, can solve the problems of complex instruments and equipment, post-processing, restrictions, etc., and achieve small particle size, uniform distribution, good selective effect

Inactive Publication Date: 2018-01-23
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, methods such as arc discharge, laser ablation, and electrochemical synthesis have been reported for the preparation of carbon quantum dots (CQDs); however, these methods are limited in practical applications due to the need for complex instruments and post-processing.

Method used

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  • A method for preparing nitrogen-doped carbon quantum dots by solid-state pyrolysis and its application
  • A method for preparing nitrogen-doped carbon quantum dots by solid-state pyrolysis and its application
  • A method for preparing nitrogen-doped carbon quantum dots by solid-state pyrolysis and its application

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Comparison scheme
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Embodiment 1

[0045] The present invention utilizes solid-phase pyrolysis method to prepare nitrogen-doped carbon quantum dots, the detailed steps of the preparation method are as follows:

[0046] a. First take 0.5g of microcrystalline cellulose and lay it flat in a polytetrafluoroethylene hydrothermal kettle, then place a glass vial with 2g ammonium bicarbonate and 3g calcium oxide in a hydrothermal kettle. In the process, Ammonium bicarbonate decomposes to produce ammonia, and the ammonia decomposed by ammonium bicarbonate in the hydrothermal kettle is excessive;

[0047] b. In a non-closed system, place the polytetrafluoroethylene hydrothermal kettle in an electric thermostat for heating, and heat up to 70°C; use the ammonia gas generated by the thermal decomposition of ammonium bicarbonate to drive out the air in the hydrothermal kettle;

[0048] c. Seal the hydrothermal kettle after removing the air in step b, set the reaction temperature to 140°C and the reaction time to 9h, and perf...

Embodiment 2

[0051] Embodiment 2: basically the same as Embodiment 1, the difference is:

[0052] In step c: set the reaction temperature to 120° C., and the reaction time to 9 h.

Embodiment 3

[0053] Embodiment 3: basically the same as Embodiment 1, the difference is:

[0054] In step c: set the reaction temperature to 160° C., and the reaction time to 9 h.

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Abstract

The invention discloses a method for utilizing a solid-phase pyrolysis method to prepare nitrogen doped carbon quantum dots and application thereof. Firstly, cellulose is flatly laid in a hydrothermal kettle, then a small glass bottle containing ammonium hydrogen carbonate and calcium oxide is put in the hydrothermal kettle; in a closed system, the hydrothermal kettle is heated, ammonia gas decomposed and produced by heating ammonium hydrogen carbonate is utilized to expel the air in the hydrothermal kettle; then, the hydrothermal kettle is sealed, the reaction temperature and the reaction time are set; after the reaction is completed, the hydrothermal kettle is cooled to reach room temperature, and dark brown solid powder is obtained; the powder is dissolved in water, centrifugation, extraction and drying are performed in sequence, and nitrogen doped carbon quantum dot solid particles are obtained after drying. The prepared N-CQDs l particles are small in size and uniform in distribution, the method has very good water solubility, optical coordination and a concentration self-quenching effect, and under the conditions of extreme pH and high ionic strength, the quantum dots can stably exist after long-time storage.

Description

1. Technical field: [0001] The invention relates to a method for preparing carbon quantum dots and its application, in particular to a method for preparing nitrogen-doped carbon quantum dots by using a solid-phase pyrolysis method and its application. 2. Background technology: [0002] Carbon quantum dots (CQDs) are a new type of fluorescent carbon nanomaterials with carbon as the main body, and their particle size is less than 10nm. Continuous, tunable light emission, small particle size and low molecular weight, good biocompatibility and low toxicity, excellent electron acceptors and donors, and other characteristics that are superior to traditional metal quantum dots. [0003] In recent years, due to the unique fluorescence properties of CQDs, it has attracted more and more attention. Compared with semiconductor quantum dots, CQDs have the characteristics of tunable excitation wavelength, low toxicity, high chemical stability, and wide application range. So far, methods...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15G01N21/64C09K11/65
CPCC01P2002/72C01P2002/82C01P2002/85C01P2004/04C01P2004/51C01P2006/60C09K11/65G01N21/6428G01N2021/6432
Inventor 王楠李亚梅杨李富陈岩刘宁马海博何占航
Owner ZHENGZHOU UNIV
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