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Carbon nano-dot, and preparation method and application thereof

A technology of carbon nano-dots and polyhydroxyls, which is applied in the field of carbon nano-dots and its preparation, can solve the problems of strong fluorescence quenching and limited application, and achieve the effects of low cost, simple preparation method and avoiding agglomeration

Active Publication Date: 2013-01-02
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the aggregated state, the nano-size effect of the material disappears, and it will show a strong fluorescence quenching phenomenon, which greatly limits the application of this type of material in solid-state light-emitting systems.
In the prior art, there is no carbon nanodot with low preparation cost, simple preparation method, environmental protection, high fluorescence quantum yield in solid state system, and can be applied to daily life.

Method used

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  • Carbon nano-dot, and preparation method and application thereof
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  • Carbon nano-dot, and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0062] The invention provides a method for preparing carbon nano-dots, comprising the following steps:

[0063] ① Urea and organic compounds containing polycarboxylates or polyhydroxyl groups, or amino acids are formulated into an aqueous solution at a mass ratio of 0.1:1-4:1;

[0064] ② The aqueous solution prepared in ① is reacted by microwave heating to obtain a brown-black solid;

[0065] ③ Prepare a brownish-black solid and heat it under vacuum to remove residual small molecule compounds to obtain carbon nanodots.

[0066] The present invention also provides an application of carbon nano-dots in the preparation of fluorescent ink, which is to dissolve the carbon nano-dots in water or an organic solvent, and centrifuge to obtain a supernatant; dilute the obtained supernatant with water or an organic solvent , to obtain carbon nanodot fluorescent ink.

[0067] Preferably, the organic solvent is ethanol.

[0068] Preferably, the centrifugal speed is 2000-4000 rpm, and the...

Embodiment 1

[0072] combine Figure 1-3 Illustrative Example 1

[0073] Preparation of carbon nano-dots of the present invention:

[0074] ① Dissolve 3 grams of urea and 3 grams of citric acid in 10 ml of water;

[0075] ② Put the aqueous solution of urea and citric acid prepared in ① into a microwave oven, and heat it in a microwave with a power of 700W for 4 minutes to obtain a brown-black solid;

[0076] ③The prepared brown-black solid was placed in a vacuum oven with a vacuum degree of 0.01 Pa and a temperature of 60 degrees Celsius, and heated for 1 hour to remove residual small molecular compounds and obtain carbon nanodots.

[0077] figure 1 It is a transmission electron microscope picture of the carbon nanodots of Example 1 of the present invention.

[0078] figure 2 It is the atomic force scanning picture a of the carbon nanodot of Example 1 of the present invention and the height curve b of the position A to B in the atomic force scanning picture.

[0079] image 3 It is ...

Embodiment 2

[0081] Preparation of carbon nano-dots of the present invention:

[0082] ① Dissolve 3 grams of urea and 3 grams of citric acid in 10 ml of water;

[0083] ② Put the aqueous solution of urea and citric acid prepared in ① into a microwave oven, and heat it in a microwave with a power of 500W for 10 minutes to obtain a brown-black solid;

[0084] ③The prepared brown-black solid was placed in a vacuum oven with a vacuum degree of 0.01 Pa and a temperature of 60 degrees Celsius, and heated for 1 hour to remove residual small molecular compounds and obtain carbon nanodots.

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Abstract

The invention discloses a carbon nano-dot, and a preparation method and an application thereof, and solves a problem that the application of present nano-dots is restricted because of high preparation cost and easy fluorescent quenching appearance of an aggregate state. According to the invention, the carbon nano-dot having a high fluorescence quantum efficiency is prepared through adopting a polycarboxyl or polyhydroxy contained organic compound, or an amino acid as a raw material, and urea as a surface passivation modification agent, and through a microwave process, and a carbon nano-dot fluorescent ink is prepared through using the carbon nano-dot. The preparation method disclosed in the invention has the advantages of simplicity, low cost and convenient large-scale production; the fluorescent quenching of the prepared carbon nano-dot on the surface of a biological product does not appear, and the highest fluorescence quantum efficiency is 42%; and the prepared carbon nano-dot fluorescent ink is nontoxic, does not generate a precipitate after long-time dispose, and can be applied to the biological imaging field, the biological product identification field, the information storage field, the information encryption field, the false proof field, the illumination display field, the photovoltaic device field and the like.

Description

technical field [0001] The invention relates to a carbon nano-dot and its preparation method and application, belonging to the field of nano-material science. Background technique [0002] Carbon nanodots, a new type of nanomaterial, have attracted increasing attention due to their many unique advantages (such as chemical stability, no light flickering, resistance to photobleaching, non-toxicity, and excellent biocompatibility) ( Luminescent Carbon Nanodots: Emergent Nanolights, Sheila N. Baker, Gary A. Baker, Angew. Chem. Int. Ed., 2010, 49, 6726). Carbon nanodots with fluorescent properties have potential applications in biological imaging, lasers, optoelectronic devices and other fields. [0003] Carbon nanodots can be prepared by various methods, such as laser ablation, electrochemical method, arc discharge method, pyrolysis method, ultrasonic generation and microwave method. Among these methods, the microwave method is favored due to its low cost and relative environm...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y40/00C09K11/65C01B32/15
Inventor 曲松楠刘星元
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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