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Near infrared emitting fluorescent carbon dot having up-conversion and down-conversion functions and preparation method thereof

A technology of fluorescent carbon dots and conversion functions, applied in the fields of chemistry and material science, can solve problems such as health hazards, cell lesions, and restricted applications, and achieve the effects of convenient operation, improved resolution, and large Stokes shift

Active Publication Date: 2017-10-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: on the one hand, heavy metal leakage and surface organic groups in near-infrared semiconductor quantum dots may cause cell pathology; on the other hand, most near-infrared semiconductor quantum dots are synthesized in the organic phase using metal-organic compounds as precursors Yes, the toxic organic solvents used in the synthesis process will pose a hazard to the environment and human health, thus seriously restricting its application in biology

Method used

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  • Near infrared emitting fluorescent carbon dot having up-conversion and down-conversion functions and preparation method thereof
  • Near infrared emitting fluorescent carbon dot having up-conversion and down-conversion functions and preparation method thereof
  • Near infrared emitting fluorescent carbon dot having up-conversion and down-conversion functions and preparation method thereof

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Embodiment 1

[0037] Example 1 Glutathione was dissolved in formamide to prepare a solution with a mass fraction of 1%. Take 50ml of the above solution and place it in a 100ml microwave reactor, then place the reactor in the microwave reactor, and take out the reactor after reacting at 160°C for 1 hour. After cooling to room temperature naturally, the reaction solution was diluted with water, dialyzed until there was no fluorescence in the dialysate, and the finally obtained solid, that is, the target product, was dried in a vacuum drying oven and sealed for storage. The elemental analysis test shows that the target product obtained in this example is carbon dots. Also, the fluorescence emission spectrum and excitation spectrum of the carbon dots obtained in this embodiment are as follows figure 1 As shown, the half width of the fluorescence emission peak is narrow, only 30nm, the fluorescence emission peak basically does not change with the excitation light wavelength, and has a large Sto...

Embodiment 2

[0039] Example 2 Glutathione was dissolved in formamide to prepare a solution with a mass fraction of 3%. Take 50ml of the above solution and place it in a 100ml microwave reactor, then place the reactor in the microwave reactor, and take out the reactor after reacting at 180°C for 1 hour. After cooling to room temperature naturally, the reaction solution was diluted with water, dialyzed until there was no fluorescence in the dialysate, and the finally obtained solid, that is, the target product, was dried in a vacuum drying oven and sealed for storage. The fluorescence spectrum figure of the carbon dots obtained in this embodiment is as follows Figure 4As shown, the half width of the fluorescence emission peak is narrow, the fluorescence emission peak basically does not change with the wavelength of the excitation light, and has a large Stokes shift.

Embodiment 3

[0040] Example 3 Glutathione was dissolved in formamide to prepare a solution with a mass fraction of 3%. Take 50ml of the above solution and place it in a 100ml microwave reactor, then place the reactor in the microwave reactor, and take out the reactor after reacting at 180°C for 1 hour. After cooling to room temperature naturally, the reaction solution was centrifuged, and the obtained precipitate was washed 4 times with acetone and methanol respectively, and the finally obtained solid, that is, the target product, was dried in a vacuum oven and sealed for storage. The fluorescence spectrum figure of the carbon dots obtained in this embodiment is as follows Figure 5 As shown, the half width of the fluorescence emission peak is narrow, the fluorescence emission peak basically does not change with the wavelength of the excitation light, and has a large Stokes shift.

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Abstract

The invention discloses a near infrared emitting fluorescent carbon dot having up-conversion and down-conversion functions and a preparation method thereof. The particle diameter of the carbon dot is 1-50nm; and under the irradiation of exciting light with different wavelengths, the positions of produced fluorescence emission peaks are all in a range of being more than 670nm and being less than or equal to 750nm, and the fluorescence quantum yield is more than 15%. The preparation method comprises the following steps: dissolving a carbon precursor in a liquid organic compound to form a mixed reaction solution, performing heating to form a green-black solution, and washing the solid separated out from the green-black solution to obtain the carbon dot. According to the invention, the carbon dot has the effects of up-conversion and down-conversion near infrared emitting, high fluorescence quantum yield, low peak width at half height and large Stokes shift, and has wide application prospects in the fields of fluorescent label imaging, drug delivery, disease diagnosis, analysis and detection and the like; and meanwhile, the preparation process is simple, quick, convenient to operate, high in yield and low in cost, does not need complicated and expensive equipment, and can easily implement large-scale production.

Description

technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to a near-infrared emitting fluorescent carbon point with an up-down conversion function and a preparation method thereof, belonging to the fields of chemistry and material science. Background technique [0002] In 2006, Sun et al., a scientist at Clemson University in the United States, first produced a new type of carbon nanomaterial—carbon quantum dots (referred to as carbon dots). As a new member of the carbon material family, its unique properties and potential applications have attracted attention. People are paying more and more attention. Different from traditional semiconductor fluorescent quantum dots, carbon dots do not contain heavy metal elements, and its main component carbon is one of the main elements that constitute life, with lower biotoxicity and better biocompatibility. In addition, carbon dots also have the characteristics of excitation...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B32/15B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 林恒伟潘露露张凌吴潇龙马利玲冷玉敏吴小雪
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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