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Carbon nanodot with thermal activation near-infrared up-conversion luminescence characteristic as well as preparation method and application of same

A technology of carbon nano-dots and luminescent properties, applied in the field of carbon nano-materials, can solve problems such as the scarcity of carbon nano-dots, the limitation of carbon nano-dots, and the lack of energy band regulation methods

Inactive Publication Date: 2019-12-27
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

However, due to the lack of effective energy band regulation means, the absorption and emission spectra of carbon nanodots in the prior art are still mainly distributed in the visible light region, and there are few types of carbon nanodots whose main absorption and emission peaks are located in the near-infrared region.
Some carbon nanodots have up-conversion luminescence characteristics, and can achieve red-near-infrared emission under the excitation of near-infrared light (Adv. Mater. The realization of multiphoton absorption requires an expensive femtosecond laser as a light source, which severely limits the wide application of carbon nanodots in in vivo fluorescence imaging, especially in upconversion imaging.

Method used

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  • Carbon nanodot with thermal activation near-infrared up-conversion luminescence characteristic as well as preparation method and application of same
  • Carbon nanodot with thermal activation near-infrared up-conversion luminescence characteristic as well as preparation method and application of same
  • Carbon nanodot with thermal activation near-infrared up-conversion luminescence characteristic as well as preparation method and application of same

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preparation example Construction

[0048] The invention provides a method for preparing the above-mentioned near-infrared up-conversion luminescent carbon nano-dots, comprising the following steps:

[0049] (1) Dissolve red light-emitting carbon nanodots in a polar aprotic solvent for stripping, and obtain near-infrared up-conversion luminescent carbon nanodots after purification

[0050] (2) Mixing the up-conversion luminescent carbon nanodots with the raw materials containing electron-withdrawing groups, the raw materials containing electron-withdrawing groups are compounds containing electron-withdrawing groups or polymers containing electron-withdrawing groups to realize near-infrared Up-conversion and down-conversion luminescence.

[0051] In the present invention, the size distribution of the up-conversion luminescent carbon nano-dots is 2-6 nm, and the height distribution is 0.4-2.0 nm, which are formed by stacking 1-3 layers of graphene-like sheets;

[0052] In the present invention, the main absorptio...

Embodiment 1

[0060] Near-infrared up-conversion luminescent carbon nano-dots are prepared by exfoliating red light-emitting carbon nano-dots in DMF with microwave heating.

[0061] The preparation method of the above-mentioned near-infrared up-conversion luminescent carbon nano-dots:

[0062] Dissolve 5 mg of red-emitting carbon nanodots (CD) in 100 mL of DMF, react in a microwave reactor at 100°C for 70 min, and remove the DMF by rotary evaporation to obtain a black solid, which is washed twice with ethanol to obtain a black powder, which is a near-infrared upper Converting Luminescent Carbon Nanodots (NIR-CD).

[0063] combine Figure 1~5 Illustrative Example 1:

[0064] Carry out transmission electron microscope (TEM) and atomic force microscope (AFM) characterization to the near-infrared up-conversion luminescent carbon nano-dot of embodiment 1, the result is as follows Figure 1-2 As shown, the TEM picture shows that the size distribution of carbon nanodots is 2-6nm, and the carbon...

Embodiment 2

[0069] Near-infrared up-conversion luminescent carbon nano-dots are prepared by ultrasonically preparing red light-emitting carbon nano-dots in DMSO.

[0070] The preparation method of the above-mentioned near-infrared up-conversion luminescent carbon nano-dots:

[0071] Dissolve 5 mg of red-emitting carbon nanodots in 100 mL of DMSO, sonicate in an ultrasonic cell disruptor (500 W) for 15 minutes, freeze-dry to remove DMSO to obtain a black solid, and wash the solid with ethanol twice to obtain a black powder, which is near-infrared upconversion luminescence carbon nanodots.

[0072] combine Image 6 Illustrative embodiment 2:

[0073] The DMSO solution of the near-infrared up-conversion luminescence carbon nano-dot of embodiment 2 is carried out fluorescence emission spectrum analysis, the result is as follows Image 6 As shown, the up-conversion luminescence peak is 784nm.

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Abstract

The invention discloses a carbon nanodot with a thermal activation near-infrared up-conversion luminescence characteristic as well as a preparation method and application of the same, and belongs to the technical field of carbon nanomaterials. The carbon nanodots are prepared by stripping red light emitting carbon nanodots and are formed by stacking a single layer or a small amount of graphene-like lamellas, and main absorption and emission peaks of the carbon nanodots are located in a near-infrared region. The up-conversion luminescence of the carbon nanodots originates from thermal activation single photon absorption and can be achieved under the excitation of a continuous laser light source; up-conversion emission peak positions are subjected to blue shift along with temperature rise, and peak intensity is enhanced; as the temperature decreases, the up-conversion emission gradually disappears while the down-conversion luminescence is enhanced. The near-infrared luminescence up-conversion carbon nanodot can be used as a near-infrared imaging reagent to be applied to variable-temperature up-conversion fluorescence imaging and in-vivo up-conversion fluorescence imaging.

Description

technical field [0001] The invention relates to the technical field of carbon nanomaterials, in particular to a carbon nanodot having near-infrared absorption and near-infrared luminescence characteristics, and a heat-activated near-infrared up-conversion luminescence characteristic, and a preparation method and application thereof. Background technique [0002] Near-infrared (700-1700nm) bioluminescence imaging is of great significance for in vivo fluorescence imaging due to its high tissue penetration depth and low autofluorescence. Up-conversion near-infrared fluorescence imaging can avoid the interference of background fluorescence (Stokes luminescence), and further improve the signal-to-noise ratio of fluorescence imaging. The development of fluorescence imaging reagents with near-infrared absorption and emission properties, especially near-infrared up-conversion emission properties, is of great significance for the clinical advancement of bioluminescence imaging. [0...

Claims

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Application Information

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IPC IPC(8): C01B32/15C09K11/65
CPCC01B32/15C01P2002/80C01P2004/04C01P2004/32C01P2004/64C09K11/65
Inventor 李迪曲松楠
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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