Synthesis method and application of red fluorescent carbon dots
A technology of red fluorescence and synthesis method, applied in the nano field, can solve the problem of unstable fluorescence, and achieve the effects of reducing cost, short reaction time and simple operation.
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Embodiment 1
[0027] A kind of synthetic method of red fluorescent carbon dot of the present embodiment, the steps are:
[0028] Mix 20 mg PTh and 15 mL concentrated nitric acid evenly, stir the reaction at 40 °C, condense and reflux for 24 h to obtain a brown carbon dot solution, the fluorescence emission peak of the carbon dots is at 595 nm, and the fluorescence excitation peak is at 430 nm.
[0029] The excitation wavelengths were selected as 365 nm, 385 nm, 405 nm, 425 nm, 445 nm, and 465 nm for excitation, and the results are shown in figure 1 , the position of the fluorescence emission peak of the carbon dots does not change with the change of the excitation wavelength, which is because the carbon core structure inside the carbon dots is relatively complete.
Embodiment 2
[0031] A kind of synthetic method of red fluorescent carbon dot of the present embodiment, the steps are:
[0032] Mix 20 mg of PTh and 15 mL of concentrated nitric acid evenly, stir the reaction at 60 °C, condense and reflux for 24 hours to obtain a brownish-red carbon dot solution, and the fluorescence emission peak of the carbon dot is located at 590nm.
[0033] Samples were taken at regular intervals, and spectroscopic measurements were performed to observe the results of the reaction process. Select samples that have been reacted for 20 min, 40 min, 1 h, 2 h, 4 h, 8 h, 12 h, and 24 h to measure their fluorescence spectra, see figure 2 , as the reaction time goes by, the fluorescence emission peak of carbon dots will not shift, but the fluorescence intensity will increase accordingly. This is because the reaction is more complete as the reaction time increases, but the temperature is relatively low, which is not enough to cause large changes to the structure of carbon do...
Embodiment 3
[0035] A kind of synthetic method of red fluorescent carbon dot of the present embodiment, the steps are:
[0036] Mix 20 mg PTh and 15 mL concentrated nitric acid evenly, stir the reaction at 80 °C, condense and reflux for 8 h to obtain a brownish-yellow carbon dot solution, and the fluorescence emission peak of the carbon dot is located at 585 nm.
[0037] Samples were taken at regular intervals, and spectroscopic measurements were performed to observe the progress of the reaction. Select samples that have been reacted for 20 min, 40 min, 1 h, 2 h, 4 h, 8 h, 12 h, and 24 h to measure their fluorescence spectra, see image 3 , as the reaction time goes by, the fluorescence emission peak of the carbon dots will not shift, but the fluorescence intensity will increase and eventually tend to be stable. This is because the reaction rate increases with the increase of the reaction temperature, but the structure of the carbon dots still does not change greatly.
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