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One-step method for green synthesis of nitrogen-doped fluorescent carbon nanodots

A carbon nanodot, green synthesis technology, applied in the synthesis field of fluorescent nanomaterials, can solve the problems of limited industrial production, low quantum yield, etc., and achieve the effects of less raw material consumption, simple operation, and low comprehensive cost.

Inactive Publication Date: 2015-07-22
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the synthesis methods of fluorescent carbon nanodots have limited their industrial production and wide application in various fields due to their low quantum yield. Therefore, it is necessary to design a simple and environmentally friendly process, low cost, high fluorescent quantum yield and novel Preparation of Fluorescent Carbon Nanodots with Fluorescent Properties and Functions

Method used

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  • One-step method for green synthesis of nitrogen-doped fluorescent carbon nanodots
  • One-step method for green synthesis of nitrogen-doped fluorescent carbon nanodots
  • One-step method for green synthesis of nitrogen-doped fluorescent carbon nanodots

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Experimental program
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Effect test

Embodiment 1

[0013] Weigh 0.5g of maleic acid and dissolve in 10mL of distilled water, measure 0.3mL of ethylenediamine and add it to the above solution, and ultrasonically dissolve it evenly to obtain a colorless and transparent solution; then transfer the colorless and transparent solution to a hydrothermal reaction kettle Heating at 180°C for 3h, 6h, 9h, 12h, 15h, 18h and 21h respectively, and naturally cooling to room temperature to obtain 7 parts of tan solutions with colors ranging from light to dark, which were filtered with a filter membrane with a pore size of 0.1 μm, and the resulting nitrogen-doped The carbon nanodot solution was fixed in a 1000mL volumetric flask. The fluorescence intensity of the solution was measured on a fluorescence spectrophotometer (FP-6500 fluorescence spectrometer, Japan JASCO.CORERATION company), as shown in Table 1.

[0014] Table 1 Effects of different heating times on the synthesis of nitrogen-doped fluorescent carbon nanodots

[0015] Hy...

Embodiment 2

[0018] Weigh 0.5g of maleic acid and dissolve in 10mL of distilled water, successively measure 0mL, 0.1mL, 0.2mL, 0.25mL, 0.3mL, 0.4mL, 0.5mL and 1.0mL of ethylenediamine into the above solution, ultrasonically It dissolves uniformly to obtain a colorless and transparent solution; then transfer the colorless and transparent solution to a hydrothermal reaction kettle, heat at 180°C for 15 hours, and naturally cool to room temperature to obtain 8 parts of tan solutions with a color from light to dark, using a pore size of 0.1 μm filter membrane, and the resulting nitrogen-doped carbon nanodot solution was constant volume in a 1000mL volumetric flask. The fluorescence intensity of the solution was measured on a fluorescence spectrophotometer (FP-6500 fluorescence spectrometer, Japan JASCO.CORERATION company), as shown in Table 2.

[0019] Table 2 Effect of the amount of ethylenediamine on the synthesis of nitrogen-doped fluorescent carbon nanodots

[0020] Ethylenediam...

Embodiment 3

[0023] Weigh 0.5g of maleic acid and dissolve in 10mL of distilled water, measure 0.25mL of ethylenediamine and add it to the above solution, and ultrasonically dissolve it evenly to obtain a colorless and transparent solution; then transfer the colorless and transparent solution to a hydrothermal reaction kettle Heated at 130°C, 150°C, 170°C, 180°C, 190°C and 200°C for 15 hours in sequence, and naturally cooled to room temperature to obtain 6 parts of tan solutions with colors ranging from light to dark, and filtered them with a filter membrane with a pore size of 0.1 μm. The obtained nitrogen-doped carbon nano-dot solution was fixed in a 1000mL volumetric flask. The fluorescence intensity of the solution was measured on a fluorescence spectrophotometer (FP-6500 fluorescence spectrometer, Japan JASCO.CORERATION company), as shown in Table 3.

[0024] Table 3 Effect of hydrothermal reaction temperature on the synthesis of nitrogen-doped fluorescent carbon nanodots

[0025] ...

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Abstract

The invention discloses a one-step method for green synthesis of nitrogen-doped fluorescent carbon nanodots, and belongs to the technical field of synthesis of fluorescent carbon nanomaterials. The one-step method for green synthesis of nitrogen-doped fluorescent carbon nanodots comprises the following steps: dissolving maleic acid in distilled water, adding ethidene diamine, trihydroxymethyl aminomethane or melamine, and carrying out ultrasonic treatment to uniformly dissolve so as to obtain a colorless transparent solution; transferring the colorless transparent solution into a hydrothermal reaction kettle to heat at 170-200 DEG C for 12-18 hours and naturally cooling to the room temperature to obtain a sepia solution; carrying out suction filtration by using a filter membrane with a pore diameter of 0.1 micron to obtain a nitrogen-doped fluorescent carbon nanodot solution. The one-step method provided by the invention is simple to operate, mild in synthesis condition, less in raw material dosage, relatively low in comprehensive cost, green, environment-friendly and easy to produce in a large scale.

Description

technical field [0001] The invention belongs to the technical field of synthesis of fluorescent nanomaterials, and in particular relates to a method for greenly synthesizing nitrogen-doped fluorescent carbon nano-dots in one step. Background technique [0002] Fluorescent carbon nanodots are a new type of carbon nanomaterials following fullerenes, carbon nanotubes and graphene. In 2004, Xu et al. accidentally discovered spherical fluorescent carbon nanoparticles for the first time when purifying single-walled carbon nanotubes produced by arc discharge. It is a carbon nano-dot, and once discovered, a carbon nano-dot has attracted great attention. This carbon nanomaterial not only has small size characteristics (size less than 10nm) and characteristic fluorescence excitation dependence (in a certain range, its emission wavelength redshifts with the redshift of the excitation wavelength), but also carbon nanodots are excellent Electron donors with photoinduced electron transf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
Inventor 冯素玲原焕过治军段俊霞庞胜彬
Owner HENAN NORMAL UNIV
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