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N, P doped carbon quantum dots as well as preparation method and application thereof

A technology of carbon quantum dots and carbon sources, which is applied in the field of fluorescent carbon nanomaterials, can solve the problems of insufficient detection sensitivity of cobalt ions, cumbersome preparation methods, and insufficient sensitivity, and achieve superior fluorescence performance, simple preparation methods, and high quantum yield. Effect

Active Publication Date: 2018-11-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these detection methods can specifically detect cobalt ions, they all have the disadvantages of troublesome preparation and insufficient sensitivity.
[0006] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the existing carbon quantum dots that can be used for the detection of cobalt ions are not only cumbersome to prepare, but also have insufficient sensitivity to the detection of cobalt ions

Method used

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  • N, P doped carbon quantum dots as well as preparation method and application thereof
  • N, P doped carbon quantum dots as well as preparation method and application thereof
  • N, P doped carbon quantum dots as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Preparation of N, P co-doped carbon quantum dots:

[0078] Step 1, weigh 0.6g of citicoline powder and place it in a 50mL clean beaker, add 0.2g of ethylenediamine and 30mL of distilled water, and completely dissolve to obtain a colorless and transparent aqueous solution.

[0079] Step 2, the colorless solution was transferred to a polytetrafluoroethylene hydrothermal reaction kettle, placed in a vacuum drying oven, and heated at a constant temperature of 180° C. for 8 hours.

[0080] Step 3, after the reaction is completed, the synthesized product is naturally cooled to room temperature, and a yellow solution will be obtained.

[0081] Step 4, the obtained yellow solution is placed in a centrifuge and centrifuged at a speed of 12000r / min for 10min, and then filtered with a 0.22μm microporous filter head to obtain a clarified carbon quantum dot solution.

[0082] Step 5, vacuum freeze-dry the obtained clear carbon quantum dot solution at a temperature of -48°C for 24 h...

Embodiment 2

[0093] Preparation of N, P co-doped carbon quantum dots:

[0094] Step 1: Weigh 0.6g of citicoline powder and place it in a 50mL clean beaker, add 0.2g of ethylenediamine and 30mL of distilled water, and completely dissolve to obtain a colorless and transparent aqueous solution.

[0095] Step 2, transfer the colorless solution to a polytetrafluoroethylene hydrothermal reaction kettle, place in a vacuum drying oven, and heat at a constant temperature of 180° C. for 4 hours.

[0096] Step 3, after the reaction is finished, the synthesized product is naturally cooled to room temperature, and the obtained yellow solution is prepared.

[0097] Step 4, the obtained yellow solution is placed in a centrifuge and centrifuged at a speed of 12000r / min for 10min, and then filtered with a 0.22μm microporous filter head to obtain a clarified carbon quantum dot solution.

[0098] Step 5, vacuum freeze-dry the obtained clear carbon quantum dot solution at a temperature of -48°C for 24 hours ...

Embodiment 3

[0100] Preparation of N, P co-doped carbon quantum dots:

[0101] Step 1, weigh 0.6g of citicoline powder and place it in a 50mL clean beaker, add 0.2g of ethylenediamine and 30mL of distilled water, and completely dissolve to obtain a colorless and transparent aqueous solution.

[0102] Step 2: Transfer the colorless solution to a polytetrafluoroethylene hydrothermal reaction kettle, place it in a vacuum drying oven, and heat it at a constant temperature at 180° C. for 6 hours.

[0103] Step 3, after the reaction is finished, the synthesized product is naturally cooled to room temperature, and the obtained yellow solution is prepared.

[0104] Step 4, the obtained yellow solution is placed in a centrifuge and centrifuged at a speed of 12000r / min for 10min, and then filtered with a 0.22μm microporous filter head to obtain a clarified carbon quantum dot solution.

[0105] Step 5, vacuum freeze-dry the obtained clear carbon quantum dot solution at a temperature of -48°C for 24 ...

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Abstract

The invention provides N, P doped carbon quantum dots as well as a preparation method and application thereof. The preparation method of the N, P doped carbon quantum dots is simple, and the obtainedN, P doped carbon quantum dots can be sensitively used for cobalt ion detection. The preparation method comprises the following steps of by taking citicoline as a carbon source, performing hydrothermal reaction on citicoline and ethylenediamine, and performing purification on a reaction product to obtain the N, P doped carbon quantum dots. The N, P doped carbon quantum dots are prepared from the following components: 47-49 percent of carbon, 27-29 percent of oxygen, 17-19 percent of nitrogen and 3-5 percent of phosphorus, preferably, for the N, P doped carbon quantum dots, the average grain diameter is 2.1-3.4nm, the interlayer spacing is 0.25-0.35nm, and the average fluorescence lifetime is 3.4-4.0ns. The preparation method provided by the invention prepares the N, P doped carbon quantumdots with one step by using citicoline as the carbon source and is simple; and the N, P doped carbon quantum dots can perform detection on cobalt ions in a solution with the limit of detection reaching 53.0nM.

Description

technical field [0001] The invention relates to the technical field of fluorescent carbon nanomaterials, in particular to an N, P doped carbon quantum dot, its preparation method and application. Background technique [0002] As a new member of the family of carbon nanomaterials, carbon dots have many superior fluorescent properties, such as adjustable fluorescence emission by changing the size and excitation wavelength, resistance to photobleaching, and no light flickering. Carbon is one of the important elements needed to form organisms, and the carbon dots made of it have low biotoxicity, good environmental friendliness and biocompatibility. In addition, the reaction conditions for preparing carbon dots are mild, the steps are simple, and the raw materials are abundant and cheap. The surface of carbon dots is rich in hydrophilic groups such as carboxyl groups and hydroxyl groups, and has good water solubility. Compared with metal quantum dots, carbon quantum dots are no...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCG01N21/6428G01N21/643C09K11/65C09K11/70B82Y20/00B82Y40/00G01N2021/6432
Inventor 吴石山王明乾沈健梁莹刘亚军
Owner NANJING UNIV
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