A kind of preparation method of water-soluble fluorescent carbon quantum dot
A carbon quantum dot, water-soluble technology, which is applied in the field of preparation of water-soluble fluorescent carbon quantum dots, can solve the problems of high reaction temperature and complicated preparation process, and achieves the effects of stable optical properties, wide sources and good fluorescence properties.
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Embodiment 1
[0017] Weigh 0.469g F127, add it into deionized water, and dissolve it completely under magnetic stirring to make the concentration 3.72×10 -4 mol / L. Take 0.059g of water-based mesophase pitch to prepare an aqueous solution, add the completely dissolved F127 solution into it, and mix evenly; then put it into a reaction kettle, and react at a temperature of 120°C for 24 hours. After the reaction, the product is centrifuged. The supernatant was taken to obtain water-soluble fluorescent carbon quantum dots.
[0018] figure 1 Be the fluorescence spectrogram of the water-soluble fluorescent carbon quantum dot prepared in embodiment 1, when its excitation spectrum is 300nm, there is fluorescence spectrum absorption peak at 340nm and 420nm place, this proves the formation of water-soluble fluorescent carbon quantum dot. figure 2 It is a transmission electron microscope image of the water-soluble fluorescent carbon quantum dots prepared in Example 1, which reflects the morphology o...
Embodiment 2
[0020] Weigh 0.469g F127, add it into deionized water, and dissolve it completely under magnetic stirring to make the concentration 8.51×10 -4 mol / L. Take 0.117g of water-based mesophase pitch to prepare an aqueous solution, add the completely dissolved F127 solution into it, and mix evenly; then put it into a reaction kettle, react at a temperature of 140°C for 20h, and centrifuge the product after the reaction is completed. The supernatant was taken to obtain water-soluble fluorescent carbon quantum dots.
[0021] The fluorescence spectrum absorption peak intensity of prepared carbon quantum dots at 340nm and 420nm place is lower than the carbon quantum dot fluorescence intensity of embodiment 1, but is much stronger than the fluorescence intensity of carbon quantum dots prepared as carbon sources such as folic acid and candle ash; Moreover, the particle distribution of carbon quantum dots is uniform and the particle size is relatively small.
Embodiment 3
[0023] Weigh 0.469g F127, add it into deionized water, and dissolve it completely under magnetic stirring to make the concentration 1.49×10 -3 mol / L. Take 0.235g of water-based mesophase pitch to prepare an aqueous solution, add the completely dissolved F127 solution into it, and mix well; then put it into a reaction kettle, react at a temperature of 160°C for 18h, and centrifuge the product after the reaction is completed. The supernatant was taken to obtain water-soluble fluorescent carbon quantum dots.
[0024] The fluorescence spectrum absorption peak intensity of prepared carbon quantum dots at 340nm and 420nm is lower than the fluorescence intensity of embodiment 1 and embodiment 2, but still stronger than the fluorescence intensity of carbon quantum dots prepared as carbon sources such as folic acid and candle ash Many; and the particle distribution of carbon quantum dots is relatively uniform, and the particle size is relatively small.
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