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Organic functional luminescent carbon quantum dots, preparation method therefor and applications thereof

A technology of carbon quantum dots and functionalization, which is applied in the field of preparation of luminescent carbon quantum dots, can solve the problems of complex process synthesis conditions, low luminescent quantum yield, difficulty in realizing relatively independent control of quantum dot size structure and surface properties, and achieve The effect of simple preparation process and high chemical stability

Inactive Publication Date: 2013-12-04
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, these methods involve complex processes and harsh synthesis conditions, making it difficult to achieve relatively independent control of parameters such as quantum dot size, structure, and surface properties.
More importantly, the obtained luminescence quantum yield is relatively low (<15%), and there are almost no reports on carbon quantum dot macroscopic bulk and thin films.

Method used

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  • Organic functional luminescent carbon quantum dots, preparation method therefor and applications thereof
  • Organic functional luminescent carbon quantum dots, preparation method therefor and applications thereof
  • Organic functional luminescent carbon quantum dots, preparation method therefor and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Preparation of organic functionalized luminescent carbon quantum dots SCQD 1: at room temperature, add 10 ml of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (AEAPMS) in a 100ml three-necked flask, degas with nitrogen 5 minutes; under nitrogen flow and stirring, the temperature was raised to 270 ° C, 0.1 g of lactic acid was quickly added to the system, and kept at this temperature for 1 minute, the product obtained was naturally cooled to room temperature, recrystallized and column separated (n-hexane: di Chloromethane (volume ratio of 2:1) was purified to obtain organic functionalized luminescent carbon quantum dots SCQD1 with high luminous efficiency.

[0062] The organic functionalized luminescent carbon quantum dot has N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane on the surface of the carbon quantum dot.

[0063] Elemental analysis found values: C, 45.81; H, 8.87; N, 13.65. Infrared spectra and 13 The C-NMR nuclear magnetic spectrum is Figure 5 and Figure ...

Embodiment 2

[0068] Preparation of organic functionalized luminescent carbon quantum dots SCQD2: at room temperature, add 50 milliliters of aminopropyltriethoxysilane to a 500ml three-necked flask, and degas with nitrogen for 15 minutes; under nitrogen and stirring, heat up to 350°C, Quickly add 8g of gluconic acid into the system, keep it at this temperature for 30 minutes, the obtained product is naturally cooled to room temperature, recrystallized and purified by column separation (the volume ratio of n-hexane:ethyl acetate is 2:1) to obtain high luminescence Efficiency of Organic Functionalized Luminescent Carbon Quantum Dots SCQD2. The surface of SCQD2 bears aminopropyltriethoxysilane with a particle size of 4.5 nm. When excited by light with a wavelength of 360 nm, SCQD2 exhibits strong blue fluorescence with a central wavelength of 450 nm in the fluorescence spectrum, a half-maximum width (FWHM) as low as 60 nm, and a luminescence quantum efficiency of 45%.

Embodiment 3

[0070] Preparation of organic functionalized luminescent carbon quantum dots SCQD3: at room temperature, add 50 milliliters of γ-glycidyl etheroxypropyltrimethoxysilane in a 500ml three-necked flask, nitrogen degassing for 15 minutes; under nitrogen and stirring, heat up To 300°C, quickly add 8g of phthalic acid into the system, keep at this temperature for 30 minutes, the product obtained is naturally cooled to room temperature, recrystallized and column separated (the volume ratio of n-hexane:ethyl acetate is 3:1 ) was purified to obtain organic functionalized luminescent carbon quantum dots SCQD3 with high luminous efficiency. The surface of SCQD3 bears aminopropyltriethoxysilane with a particle size of 1.5 nm. When excited with light in the wavelength range of 340–400 nm, SCQD3 exhibits strong blue fluorescence with a luminous quantum efficiency of 15%.

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Abstract

The invention relates to nano optical functional materials, especially relates to an organic functional luminescent carbon quantum dots with high luminescent efficiency, a preparation method therefor and applications thereof. The preparation method employs a single-step pyrolysis synthesis method: organic compounds with a low decomposition temperature (150-300 DEG C) is heated at a temperature of 150-350 DEG C (the organic compounds are generally heated for 1-360min and heating methods comprise organic pyrolysis, hydrothermal method and the like) and subjected to a pyrolytic reaction; organic functional luminescent carbon quantum dots are obtained after post-treatment and purification. Surfaces of carbon quantum dots are modified with organosilane or organic high-molecular compounds with acylamino to form the organic functional luminescent carbon quantum dots. The organic functional luminescent carbon quantum dots can be used as luminescent functional materials, optical functional nano hybrid composite materials or used as biological living cell imaging materials.

Description

technical field [0001] The present invention relates to nano-optic functional materials, in particular to a class of organic functionalized luminescent carbon quantum dots with high luminous efficiency and its use, and a preparation method for the organic functionalized luminescent carbon quantum dots. Background technique [0002] Since 2006, luminescent carbon quantum dots, as an extremely attractive class of graphite and amorphous carbon nanoparticles, have attracted widespread attention from scientists due to their attractive applications in optoelectronic devices and biomarkers (Angew.Chem. Int. Ed. 2010, 49, 6726). Compared with traditional organic dyes and semiconductor quantum dots, the advantages of luminescent carbon quantum dots are chemical inertness, large two-photon excitation cross section, low toxicity and excellent biocompatibility (J.Am.Chem.Soc.2007,129 , 11318; 2009, 131, 11308; J. Phys. Chem. C2009, 113, 18110; 2010, 114, 12062). The particle size of c...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y30/00B82Y20/00G01N21/64
Inventor 刘春艳王富谢政刘云张兵
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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