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A preparation method of mechanofluorescent color-tunable carbon dots

A fluorescence and color technology, used in chemical instruments and methods, luminescent materials, nano-optics, etc., can solve problems such as cumbersome steps, and achieve the effects of simple operation, expansion of development and application fields, and short reaction period.

Active Publication Date: 2022-03-01
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are some reports on mechanotropic fluorescent carbon dot materials, see: 1) Lu, S.; Xiao, G.; Sui, L.; Feng, T.; Yong, X.; Zhu, S.; Li , B.; Liu, Z.; Zou, B.; Jin, M., Angew. Chem., Int. Ed. 2017, 56(22), 6187-6191.2) Liu, C.; Xiao, G.; Yang , M.; Zou, B.; Zhang, Z.L.; Pang, D.W., Angew.Chem., Int.Ed.2017, 130(7). The fluorescent color change method of these carbon dots is mainly to achieve fluorescence by applying external pressure Although the obtained product has the advantages of convenient operation and adjustable fluorescence, the preparation process still has the disadvantage of cumbersome steps.

Method used

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  • A preparation method of mechanofluorescent color-tunable carbon dots
  • A preparation method of mechanofluorescent color-tunable carbon dots
  • A preparation method of mechanofluorescent color-tunable carbon dots

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 1. Measure 5 mL each of N, N-dimethylformamide and distilled water into a polytetrafluoroethylene reactor, and weigh 34 mg (0.05 mmol) of 1,3,6,8-tetrakis(4-carboxybenzene) Pyrene and 20 μL (0.3 mmol) of analytically pure ethylenediamine were added to the mixed solution, and sonicated until the solid was dissolved. After reacting for 6 h in an air-blast drying oven at 180° C., it was naturally cooled to room temperature. Transfer the product in the polytetrafluoroethylene reactor to a 500D dialysis bag, dialyze with distilled water for 24 hours, and change the distilled water every 4 hours; then put the liquid in the dialysis bag into a centrifuge tube and centrifuge at a speed of 11000r / min for 15 minutes; Take the supernatant and dry the liquid in a blast drying oven to finally obtain a yellow-green solid powder, which appears yellow-green under a 365nm ultraviolet lamp. figure 2 It is the fluorescence emission spectrum of the carbon dots without grinding treatment ...

Embodiment 2

[0041]Step 1 is the same as Step 1 of Example 1. In Step 2, it is only necessary to change the grinding time of 1 min in Step 2 of Example 1 to 5 min, and other conditions remain unchanged. Finally, the fluorescence emission spectrum at the excitation wavelength of 365nm was obtained. Figure 4 It is the fluorescence emission spectrum of the carbon dots ground for 5 minutes at the excitation wavelength of 365nm, and the emission peak is observed at 497nm.

Embodiment 3

[0043] Step 1 is the same as Step 1 of Example 1. In Step 2, it is only necessary to change the grinding time of 1 min in Step 2 of Example 1 to 10 min, and other conditions remain unchanged. Finally, the fluorescence emission spectrum at the excitation wavelength of 365nm was obtained. Figure 5 It is the fluorescence emission spectrum of the carbon dots ground for 10 min at the excitation wavelength of 365nm, and the emission peak is observed at 495nm.

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Abstract

The invention relates to a method for preparing mechanofluorescent color-adjustable carbon dots. The method comprises the following steps: (1) Solvothermal reaction: 1,3,6,8-tetrakis(4-carboxybenzene)pyrene and ethylenediamine are added to a mixed solution of N,N-dimethylformamide and distilled water , ultrasonically stirred, cooled to room temperature after reaction; (2) dialysis: transfer the product obtained in the previous step to a dialysis bag for permeation; (3) centrifugation: transfer the product to a centrifuge tube, and take the supernatant to dry after centrifugation. The solid powder is obtained; the fluorescent color is yellow-green under a 365 nm ultraviolet lamp; (4) Grinding: the solid powder is ground in an agate mortar for 10-30 min; Fluorescent powder. The invention has the characteristics of fluorescent discoloration only through simple grinding treatment, and the fluorescent color can be restored through acid fumigation treatment.

Description

technical field [0001] The invention belongs to the field of luminescent materials, and specifically relates to a method for preparing mechanofluorescence color-changing carbon dots and restoring their fluorescence color. The present invention is prepared by dissolving 1,3,6,8-tetrakis(4-carboxyphenyl)pyrene into N,N-dimethylformamide:distilled water 1:1, adding a small amount of ethylenediamine for hydrothermal reaction, After purification and drying, solid carbon dots were obtained. After simple grinding, the carbon dots can be observed under ultraviolet light to change the fluorescent color from yellow-green to blue. The ground-discolored carbon dots can be restored to their previous fluorescent color by acid fumigation, and this new type of mechanochromic carbon dots promotes the potential application of carbon dots. Background technique [0002] Carbon dots are nanomaterials with a particle size below 10nm. They have the advantages of low toxicity, good biocompatibili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCC09K11/65B82Y20/00B82Y40/00
Inventor 徐阳李玉函李焕荣张晓宇
Owner HEBEI UNIV OF TECH
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