A Safe and Simple Method for Double-doped Nitrogen and Phosphorus Carbon Quantum Dots
A dual-doping and quantum dot technology, applied in chemical instruments and methods, measuring devices, fluorescence/phosphorescence, etc., can solve the problems of high toxicity of nitrogen doping agents, cumbersome preparation of carbon quantum dots, poor fluorescence performance, etc., and achieve solubility Good, Reaction Safe, Avoid Effects of Reaction Conditions
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Embodiment 1
[0035] Preparation of tryptophan-carbon dots:
[0036] Weigh 0.005mol of tryptophan and 0.005mol of glucose into a beaker, add 5ml of deionized water, add 5ml of phosphoric acid solution with a mass fraction of 80%, stir until completely dissolved, and form a clear and transparent solution;
[0037] The beaker was placed in an ultrasonic machine for ultrasonic treatment for 2 h, and the ultrasonic frequency was 40 Hz. There was no change in the appearance of the solution after sonication.
[0038] The solution was transferred to a 25ml round bottom flask, heated to reflux in a constant temperature heating magnetic stirrer, the temperature was maintained at 90°C, and heated for 5 hours. During the heating process, the color of the solution gradually changed from clear and transparent to red, and finally became purple. After heating, cool to room temperature. After appropriate dilution, the carbon dots are red under sunlight and orange-red fluorescence under 365nm ultraviolet ...
Embodiment 2
[0046] Preparation of glutamate-carbon dots:
[0047] Weigh 0.0005mol glutamic acid and 0.005mol glucose and pour them into a beaker, add 5ml deionized water, then pour 5ml phosphoric acid solution with a mass fraction of 85%, and stir until completely dissolved to form a clear and transparent solution;
[0048] The beaker was placed in an ultrasonic machine for ultrasonic treatment for 2 h, and the ultrasonic frequency was 50 kHz.
[0049] The solution was transferred to a 25ml round bottom flask, heated to reflux in a constant temperature heating magnetic stirrer, the temperature was maintained at 150°C, and heated for 1 hour. During the heating process, the color of the solution gradually changed from clear and transparent to brown. After heating, cool to room temperature. After dilution, the obtained high-concentration carbon dots are light yellow in sunlight, and emit yellow light under 365nm ultraviolet light.
[0050] Centrifuge at 20,000rmp for 10min to remove large pa...
Embodiment 3
[0052] Preparation of aspartic acid-carbon dots:
[0053] Weigh 0.005mol of aspartic acid and 0.005mol of citric acid monohydrate into a beaker, add 5ml of deionized water, add 5ml of phosphoric acid solution with a mass fraction of 90%, stir until completely dissolved, and form a clear and transparent solution;
[0054] The beaker was placed in an ultrasonic machine for ultrasonic treatment for 2 h, and the ultrasonic frequency was 60 kHz. There was no change in the appearance of the solution after sonication.
[0055] The solution was transferred to a 25ml round bottom flask, heated to reflux in a constant temperature heating magnetic stirrer, the temperature was maintained at 120°C, and heated for 2 hours. During the heating process, the color of the solution gradually changed from clear and transparent to red, and finally turned into dark brown. After heating, cool to room temperature. After appropriate dilution, the carbon dots are brown in sunlight and blue in 365nm ul...
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