Solid-state luminescent carbon nano-dots, preparation method and application

A solid-state luminescence and carbon nano-dot technology, applied in the field of carbon nano-dots, can solve the problems of harsh reaction conditions, high cost, and the need for catalysts, and achieve the effect of short fluorescence lifetime

Active Publication Date: 2020-11-03
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction conditions of this method are relatively harsh, catalysts are required, the cost is high, and solid-state luminescence is still achieved in a low-concentration doped system of carbon nanodots.
[0005] At present, there are few reports on obtaining carbon nanodots without aggregation-induced fluorescence quenching properties in the solid state by simple methods.

Method used

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  • Solid-state luminescent carbon nano-dots, preparation method and application
  • Solid-state luminescent carbon nano-dots, preparation method and application
  • Solid-state luminescent carbon nano-dots, preparation method and application

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Embodiment 1

[0045] A solid-state luminescent carbon nano-dot is prepared by a solvothermal method using citric acid and a polyamine-based polymer as raw materials.

[0046] The preparation method of the above-mentioned solid-state luminescent carbon nano-dots comprises the following steps:

[0047]S1. Dissolve 3g of citric acid and 6ml of branched polyethyleneimine (50wt.% aqueous solution) with a mass average molecular weight of 2000 in 20ml of deionized water, stir evenly, then place in a closed reaction kettle, and react at 160°C for 6h ;

[0048] S2. Centrifuge the reacted solution in S1 for 3 times in a centrifuge at a speed of 8000r / min, remove insoluble polymers, and obtain a supernatant after centrifugation; transfer the supernatant obtained by centrifugation to the molecular weight cut-off Dialyze with deionized water for 5 days in a 3500 dialysis bag to obtain a dialysate, place the retained solution in the dialysis bag in a lyophilizer, lyophilize, and grind to obtain solid-st...

Embodiment 2

[0050] A solid-state luminescent carbon nano-dot is prepared by a solvothermal method using citric acid and a polyamine-based polymer as raw materials.

[0051] The preparation method of the above-mentioned solid-state luminescent carbon nano-dots comprises the following steps:

[0052] S1. Dissolve 3g of citric acid and 6ml of branched polyethyleneimine (50wt.% aqueous solution) with a mass average molecular weight of 2000 in 20ml of DMF, stir evenly, then place in a closed reaction kettle, and react for h at 160°C;

[0053] S2. Centrifuge the reacted solution in S1 for 3 times in a centrifuge at a speed of 8000r / min, remove insoluble polymers, and obtain a supernatant after centrifugation; transfer the supernatant obtained by centrifugation to the molecular weight cut-off Dialyze with deionized water for 5 days in a 3500 dialysis bag to obtain a dialysate, place the retained solution in the dialysis bag in a lyophilizer, lyophilize, and grind to obtain solid-state luminescen...

Embodiment 3

[0055] A solid-state luminescent carbon nano-dot is prepared by a solvothermal method using citric acid and a polyamine-based polymer as raw materials.

[0056] The preparation method of the above-mentioned solid-state luminescent carbon nano-dots comprises the following steps:

[0057] S1. Dissolve 3 g of citric acid and 4 g of linear polyethyleneimine hydrochloride with a mass average molecular weight of 4000 in 20 ml of water, stir evenly, then place in a closed reaction kettle, and react at 180° C. for 8 hours;

[0058] S2. Centrifuge the reacted solution in S1 for 3 times in a centrifuge at a speed of 8000r / min, remove insoluble polymers, and obtain a supernatant after centrifugation; transfer the supernatant obtained by centrifugation to the molecular weight cut-off Dialyze with deionized water for 5 days in a 3500 dialysis bag to obtain a dialysate, place the retained solution in the dialysis bag in a lyophilizer, lyophilize, and grind to obtain solid-state luminescent ...

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Abstract

The invention provides a solid-state luminescent carbon nano-dot. The solid-state luminescent carbon nano-dot is prepared by a solvothermal method using citric acid and a polyamine-based polymer as raw materials. The invention also provides a preparation method of the solid-state luminescent carbon nano-dot. The solid-state luminescent carbon nano-dot of the present invention is prepared by a one-step solvothermal method by using citric acid and a polyamine-based polymer as reaction raw materials. The carbon nano-dots of the present invention are solid-state luminescent pure carbon nano-dots, and under the excitation of blue light, the carbon nano-dots can emit bright fluorescence without any dispersion matrix.

Description

technical field [0001] The invention belongs to the technical field of carbon nano-dots, and in particular relates to a solid-state luminescent carbon nano-dot, a preparation method and an application thereof. Background technique [0002] Carbon nanodots (Carbon dots, CDs) are a new type of luminescent carbon nanomaterials, which are considered as potential candidates for organic dyes and semiconductor quantum dots due to their good stability, water solubility, photobleaching resistance and excellent biocompatibility. alternatives. With the above advantages, carbon nanodots have broad application prospects in the fields of biological imaging, optoelectronic devices, biomarkers, and sensing. At present, carbon nanodots have achieved high-efficiency luminescence in the blue and green light bands, and the fluorescence quantum efficiency of its aqueous solution has reached more than 60%. [0003] Recently, carbon nanodots, as a fluorescent material, have been applied to solid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00H01L33/50
Inventor 李迪曲松楠刘恩山
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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