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Multifunctional green fluorescent carbon dot as well as preparation method and application thereof
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A green fluorescent and multifunctional technology, applied in the field of fluorescent nanomaterials, can solve the problems of high cost and complicated storage conditions
Active Publication Date: 2021-07-06
SHANXI UNIV
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Abstract
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Problems solved by technology
At present, the only commercial nucleolar probe is SYTO RNASelect, which has the disadvantages of high cost and complicated storage conditions.
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Embodiment 1
[0034] Preparation of multifunctional green fluorescent carbon dots:
[0035] (1) Add 0.24g of 3,5-diaminobenzoic acid and 0.46g of citric acid into 20mL of deionized water to prepare a mixed solution;
[0036] (2) Transfer the mixed solution obtained in (1) to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 220° C. for 3 hours;
[0037] (3) The product obtained in (2) is centrifuged with a centrifuge at a speed of 4000r / min for 20min to remove insoluble matter to obtain a clarified solution, which is filtered and dialyzed to obtain a multifunctional green fluorescent carbon dot solution;
[0038] (4) freeze-dry the multifunctional green fluorescent carbon dot solution obtained in (3) to obtain multifunctional green fluorescent carbon dots.
[0039] The photos of the prepared multifunctional green fluorescent carbon dot solution under the excitation of fluorescent lamp and wavelength of 420nm are shown in figure 1 , where the left picture is the pictur...
Embodiment 2
[0046] Preparation of multifunctional green fluorescent carbon dots:
[0047] (1) Add 0.24g of 3,5-diaminobenzoic acid and 0.46g of citric acid into 30mL of deionized water to prepare a mixed solution;
[0048] (2) Transfer the mixed solution obtained in (1) to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 220° C. for 5 hours;
[0049] (3) The product obtained in (2) is centrifuged with a centrifuge at a speed of 4000r / min for 20min to remove insoluble matter to obtain a clarified solution, which is filtered and dialyzed to obtain a multifunctional green fluorescent carbon dot solution;
[0050] (4) freeze-dry the multifunctional green fluorescent carbon dot solution obtained in (3) to obtain multifunctional green fluorescent carbon dots.
Embodiment 3
[0052] Preparation of multifunctional green fluorescent carbon dots:
[0053] (1) Add 0.24g of 3,5-diaminobenzoic acid and 0.46g of citric acid into 20mL of deionized water to prepare a mixed solution;
[0054] (2) Transfer the mixed solution obtained in (1) to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 190° C. for 5 hours;
[0055] (3) The product obtained in (2) is centrifuged with a centrifuge at a speed of 4000r / min for 20min to remove insoluble matter to obtain a clarified solution, which is filtered and dialyzed to obtain a multifunctional green fluorescent carbon dot solution;
[0056] (4) freeze-dry the multifunctional green fluorescent carbon dot solution obtained in (3) to obtain multifunctional green fluorescent carbon dots.
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Abstract
The invention provides a multifunctional green fluorescent carbon dot as well as a preparation method and application thereof, and belongs to the field of fluorescent nano material preparation. The method comprises a carbon dot preparation step: dissolving 3, 5-diaminobenzoic acid and citric acid in secondary water, and transferring into a hydrothermal reaction kettle for hydrothermal reaction; and centrifuging the obtained product to remove insoluble substances, dialyzing to remove impurities to obtain a multifunctional green fluorescent carbon dot solution, and freeze-drying to obtain the multifunctional green fluorescent carbon dot. The method is simple in process and low in preparation condition requirement; and the prepared multifunctional green fluorescent carbon dot is low in toxicity and high in fluorescent quantum yield. The prepared multifunctional green fluorescent carbon dot can be applied to NO2 <-> detection, pH sensing and nucleolus targeting in cells and NO2 <-> colorimetric recognition in an aqueous solution.
Description
technical field [0001] The invention relates to fluorescent nanomaterials, in particular to a multifunctional green fluorescent carbon dot and a preparation method thereof, and the application of the multifunctional green fluorescent carbon dot to NO in cells 2 - Detection, pH sensing and targeting of nucleoli and NO in aqueous solutions 2 - Colorimetric identification. Background technique [0002] In 2004, Xu et al. (J.Am.Chem.Soc., 2004, 126, 12736-12737) reported for the first time that carbon dots were unexpectedly discovered during the separation and purification of single-walled carbon nanotubes. In 2006, Sun et al. (J.Am.Chem.Soc., 2006, 128, 7756-7757) synthesized fluorescent carbon dots with excellent performance through surface passivation by laseretching. Since then, carbon dots have become good substitutes for traditional semiconductorquantum dots due to their tunable fluorescence, excellent photostability, good water solubility, low toxicity, and excellen...
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Application Information
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