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A method for synthesizing a large number of wavelength-tunable fluorescent carbon dots and carbon quantum dots prepared by the method

A technology of fluorescent carbon dots and synthesis wavelength, which is applied in the field of nanomaterials, can solve the problems of complex reaction system, low preparation yield, and insufficiently wide adjustable range of emission wavelength, and achieves cheap and easy-to-obtain raw materials, simple synthesis method, and enhanced ionization. the effect of strength

Inactive Publication Date: 2018-06-01
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these works still have problems such as the emission wavelength tunable range is not wide enough, the reaction system is too complex, and the production yield is low, which seriously hinders the application of fluorescent tunable carbon dots in the fields of multi-color display and multi-color labeling.
Most importantly, they need to use different carbon sources and reaction conditions, which brings more uncertainties to the in-depth study of the fluorescence mechanism of carbon quantum dots.

Method used

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  • A method for synthesizing a large number of wavelength-tunable fluorescent carbon dots and carbon quantum dots prepared by the method
  • A method for synthesizing a large number of wavelength-tunable fluorescent carbon dots and carbon quantum dots prepared by the method
  • A method for synthesizing a large number of wavelength-tunable fluorescent carbon dots and carbon quantum dots prepared by the method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 prepares six kinds of carbon quantum dot solutions

[0044] (1) Prepare six kinds of reacted carbon quantum dot solutions.

[0045] Measure 15ml of formamide, N,N-dimethylformamide, methanol, ethanol, dilute hydrochloric acid aqueous solution (volume ratio 1:10), dilute sulfuric acid aqueous solution (volume ratio 1:10), and put them into a 50ml beaker Then weigh 0.3 grams of L-glutamic acid and 0.2 grams of o-phenylenediamine, and stir until completely dissolved; transfer the mixed solution to a high-pressure reactor; preheat the high-temperature oven to 200 ° C, and then react The kettle was put into an oven to react for 8 hours, and after the reaction was completed, it was naturally cooled to room temperature.

[0046] (2) Purify six kinds of carbon quantum dot solutions.

[0047] Add 20 ml of acetone, aqueous KOH solution, aqueous HCl solution, aqueous KOH solution, ethanol, and methanol to the carbon quantum dot solution obtained in step (1). Then s...

Embodiment 2

[0051] The preparation method is the same as that in Example 1, but the reaction temperature is changed to 180°C, and other conditions remain unchanged. The emission peak positions of the six fluorescent carbon dots finally obtained are: 431, 517, 5551, 573, 633, and 695 nm, and the quantum yields are as follows: 38%, 27%, 33%, 18%, 15%, 19%, the mass yields are: 39%, 34%, 27%, 41%, 43%, 40%. From the results, lowering the temperature produces a blue shift to the emission wavelength, a decrease in the quantum yield, and a decrease in the mass yield, which may be because the decrease in temperature affects the formation of the carbon core.

Embodiment 3

[0053] The preparation method is the same as that in Example 1, but the reaction temperature is changed to 160°C, and other conditions remain unchanged. The emission peak positions of the six fluorescent carbon dots finally obtained are respectively: 423, 511, 546, 563, 621, and 675 nm, and the quantum yields are: 36%, 22 %, 30%, 12%, 11%, 15%, the mass yields are: 33%, 24%, 19%, 32%, 28%, 31%. From the results, further lowering the temperature will still continue to lead to the reduction of the emission efficiency and mass yield of the multicolor fluorescent carbon quantum dots, as well as the blue shift of the emission wavelength.

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Abstract

The invention discloses a method for synthesizing fluorescence carbon dots with adjustable wave length in quantity and the carbon quantum dots prepared through the method, and relates to a preparation method of the carbon dots with higher synthesis fluorescence efficiency and mass yield and adjustable emission wavelength in a whole visible region by utilizing the same precursor as a carbon source. According to the preparation method for heat-treating the same carbon source by adopting different solvents and a fast precipitation purification method, the process is simple, high-efficient, green and environment-friendly, raw materials are cheap, and the reaction temperature is 160 to 250 DEG C. Each synthesized carbon quantum dot is formed by compounding a graphitized crystal lattice core and a layer of amorphous carbon shell, and has better solubility, stability and higher luminous efficiency in a common solvent; the diameter is gradually increased along with emission wavelength red shift and is 2 to 12nm. The synthesized carbon quantum dot as a novel luminescent material has the advantages of low production cost, high preparation yield, good light emitting stability low biotoxicity and favorable application prospect in application of photoelectric devices. The preparation method of the high-efficient near infrared fluorescence carbon dots brings convenience and chance for biological application of the carbon dots.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a method for synthesizing a large number of fluorescent carbon dots with adjustable wavelength and carbon quantum dots prepared by the method, especially a kind of high-efficiency fluorescent carbon quantum dots with adjustable wavelength in the entire visible light region. Mass preparation method. Background technique [0002] Due to their unique physical and chemical properties, semiconductor quantum dots show great application prospects in the fields of energy, environment and biomedicine. However, such nanomaterials usually have disadvantages such as expensive raw materials, poor photostability, and high toxicity, so their application in scientific research and daily life has been seriously hindered. Carbon quantum dots, since they were first discovered in 2004, have rapidly grown into a new star in the field of nanomaterials. Due to its strong luminescenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65
CPCC09K11/65
Inventor 丁辉
Owner CHINA UNIV OF MINING & TECH
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