Red light emitting carbon nanodot and preparation method and application thereof

A carbon nano-dot, red light technology, applied in nano-carbon, nano-technology, nano-optics and other directions, can solve the problems of high process requirements, poor structural stability of red light-emitting carbon nano-dots, complicated preparation methods, etc., and achieve high fluorescence quantum yield. efficiency, enhanced single-photon down-conversion and multi-photon up-conversion fluorescence

Pending Publication Date: 2022-05-13
UNIVERSITY OF MACAU
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Problems solved by technology

The reported red-emitting carbon nanodots usually need to be prepared through tedious steps and complicated purification, and their red emission in water is usually weak, and only efficient red emission can be achieved in organic solutions, which greatly hinders their incorporation into In Vivo Bioimaging and Biomedical Applications
[0004] It can be seen that the existing methods for preparing red light-emitting carbon nanodots generally have the following problems: (1) the preparation method is cumbersome, the process requirements are high, and it is difficult to achieve mass production; (2) the prepared red light-emitting carbon nanodots have poor structural stability , and poor luminescence performance

Method used

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  • Red light emitting carbon nanodot and preparation method and application thereof
  • Red light emitting carbon nanodot and preparation method and application thereof
  • Red light emitting carbon nanodot and preparation method and application thereof

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preparation example Construction

[0049] An embodiment of the present invention provides a method for preparing red light-emitting carbon nanodots, comprising the following steps:

[0050] S1, synthesis

[0051] By mixing citric acid and urea with formic acid for solvothermal reaction, highly efficient red-emitting carbon nanodots were synthesized via a one-step solvothermal method without complicated purification procedures.

[0052] In the actual operation process, citric acid and urea were dissolved in formic acid, then put into the reaction kettle, heated at high temperature, and subjected to solvothermal reaction to obtain a reddish-brown liquid, that is, to obtain red light-emitting carbon nanodots.

[0053]In some embodiments, the mass ratio of citric acid and urea is 1:1-4; preferably 1:2-3. By further controlling the mass ratio of citric acid and urea, it is beneficial to further improve the performance of the synthesized carbon nano-dots and improve the fluorescence quantum efficiency of the carbon ...

Embodiment 1

[0074] This embodiment provides a method for preparing red light-emitting carbon nanodots, comprising the following steps:

[0075] Dissolve 2g of citric acid and 4g of urea in 20mL of formic acid, put the liquid into a 50mL polytetrafluoroethylene autoclave, heat the reaction, the reaction temperature is 160°C, the reaction time is 4 hours, the heating method is oven heating, after the reaction Add 60 mL of ethanol to the solution, centrifuge at 10,000 rpm, remove the upper layer solution, leave a layer of sediment, centrifuge 3 times, and freeze-dry the lower layer of sediment to obtain a black solid powder that is red light-emitting carbon nanodots (FA-CDs).

Embodiment 2

[0077] This embodiment provides a method for preparing red light-emitting carbon nanodots, comprising the following steps:

[0078] Dissolve 1g of citric acid and 2g of urea in 10mL of formic acid, put the liquid into a 30mL polytetrafluoroethylene autoclave, heat the reaction, the reaction temperature is 160°C, the reaction time is 4 hours, the heating method is oven heating, after the reaction Add 20 mL of ethanol to the solution, centrifuge at 8000 rpm, remove the upper layer solution, leave a layer of sediment, centrifuge twice, and freeze-dry the lower layer of sediment to obtain a black solid powder that is red light-emitting carbon nanodots.

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Abstract

The invention discloses a red light emitting carbon nanodot as well as a preparation method and application thereof, and relates to the technical field of carbon nanomaterials. Citric acid, urea and formic acid are used as raw materials to synthesize the efficient red light emission carbon nanodot through a one-step solvothermal method, a complex purification procedure is not needed, the surface of the prepared carbon nanodot has a strong electron withdrawing structure, and the red light emission carbon nanodot has red light emission with high fluorescence quantum efficiency. The prepared carbon nanodot can form a composite material with albumin, has high fluorescence quantum yield in an aqueous solution, has obviously enhanced single-photon down-conversion and multi-photon up-conversion fluorescence, and can be applied to bioimaging and biomedical treatment.

Description

technical field [0001] The invention relates to the technical field of carbon nanomaterials, in particular to a red light-emitting carbon nanodot, its preparation method and application. Background technique [0002] Carbon nanodots are zero-dimensional carbonaceous nanomaterials with ultra-small size (usually less than 10 nanometers), simple synthesis methods, easy surface functionalization, low toxicity, good biocompatibility and excellent luminescence properties and other advantages, has attracted a lot of research, especially in the fields of bioimaging and biomedicine. Non-invasive in vivo fluorescence imaging requires an ideal operating spectral window in the red to near-infrared range of 650-1450 nm. Therefore, carbon nanodots with strong emission in the red to near-infrared region in aqueous solution have broad application prospects. [0003] At present, the reported absorption and emission spectra of carbon nanodots are mainly distributed in the blue and green lig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y40/00
CPCC01B32/15C09K11/65B82Y20/00B82Y40/00
Inventor 曲松楠张蕙琦汤子康
Owner UNIVERSITY OF MACAU
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