A ratio-type fluorescent carbon dot and its preparation method and method for detecting dopamine
A fluorescent carbon dot, ratio-type technology, applied in the direction of fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problems of cumbersome manufacturing process, achieve simple synthesis methods, economical and easy-to-obtain raw materials, and eliminate background signal interference Effect
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Embodiment 1
[0026] Step 1. Dissolve 0.03 g of p-phenylenediamine and 100 μL of triethylamine in 10 mL of ethanol at room temperature, and stir thoroughly to obtain a transparent solution.
[0027] Step 2, transfer the solution to a 20mL hydrothermal reaction kettle.
[0028] Step 3: Put the reaction kettle in an oven and react at 180°C for 8 hours to obtain a crude product.
[0029] Step 4, after the crude product was naturally cooled, the crude product solution was centrifuged at 5000 rpm for 10 min to remove insoluble matter to obtain a light brown transparent solution.
[0030] Step 5, dialyze the above solution in distilled water for 24 hours with a 500 Da dialysis bag, and change the water every 4 hours to obtain ratiometric fluorescent carbon dots emitting blue fluorescence.
[0031] The carbon dots prepared in Example 1 were characterized by TEM, infrared spectrum, ultraviolet absorption spectrum and fluorescence spectrum as follows: Figure 1(a)-4(b) As shown, wherein, Fig. 1 (a...
Embodiment 2
[0037] Step 1. Dissolve 0.03 g of p-phenylenediamine and 100 μL of triethylamine in 10 mL of ethanol at room temperature, and stir thoroughly to obtain a transparent solution.
[0038] Step 2, transfer the solution to a 20mL hydrothermal reaction kettle.
[0039] Step 3: Put the reaction kettle in an oven and react at 250°C for 6 hours to obtain a crude product.
[0040] Step 4, after the crude product was naturally cooled, the crude product solution was centrifuged at 5000 rpm for 10 min to remove insoluble matter to obtain a light brown transparent solution.
[0041] Step 5, dialyze the above solution in distilled water for 24 hours with a 500 Da dialysis bag, and change the water every 4 hours to obtain ratiometric fluorescent carbon dots emitting blue fluorescence.
Embodiment 3
[0043] Step 1. Dissolve 0.03 g of p-phenylenediamine and 100 μL of triethylamine in 10 mL of ethanol at room temperature, and stir thoroughly to obtain a transparent solution.
[0044] Step 2, transfer the solution to a 20mL hydrothermal reaction kettle.
[0045] Step 3: Put the reaction kettle in an oven and react at 100°C for 24 hours to obtain a crude product.
[0046] Step 4, after the crude product was naturally cooled, the crude product solution was centrifuged at 5000 rpm for 10 min to remove insoluble matter to obtain a light brown transparent solution.
[0047] Step 5, dialyze the above solution in distilled water for 24 hours with a 500 Da dialysis bag, and change the water every 4 hours to obtain ratiometric fluorescent carbon dots emitting blue fluorescence.
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