A kind of bifunctional graphene quantum dot and its preparation method and application
A dual-function, quantum dot technology, applied in the field of biosensors, can solve the problems that the detection results are easily affected by the detection environment, increase the biotoxicity of carbon dots, and the instability of electrochemical signals, and achieve strong water solubility and good fluorescence quenching efficiency , highly specific effect
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Embodiment 1
[0046] The preparation of embodiment 1DPA-GQD-His
[0047] Take a certain amount of citric acid monohydrate in a beaker, add water to ultrasonically dissolve, then weigh D-penicillamine and Histidine was dissolved in a beaker and sonicated. After the dissolution is complete, quantitatively transfer to a high-pressure reactor, place in a blast drying oven, and react for 1 hour at 200°C. After the reaction, the pH of the obtained solution was adjusted to neutral, and then placed in a 3.5KD dialysis bag for dialysis for 48 hours. After the dialysis, the solution in the bag was taken and freeze-dried to obtain D-penicillamine-histidine bifunctional graphene quantum dots (DAP-GQD-His) solid powder. The D-penicillamine-histidine double graphene quantum dot prepared in this embodiment is characterized, by figure 1 The TEM image shows that the D-penicillamine-histidine bifunctional graphene quantum dot DPA-GQD-His is composed of 2D graphene sheets with a size between 1-6nm and an a...
Embodiment 2
[0051] The preparation of embodiment 2DPA-GQD-His
[0052] When the reaction temperature in Example 1 is 200°C, and the reaction time is 1h, control citric acid: the molar ratio of histidine is 1:1, adjust the molar ratio of citric acid and D-penicillamine, so that D-penicillamine The molar ratios of mycamine to citric acid are respectively 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, and the rest of the operation steps are consistent with Example 1, and different DPA-GQD-His D-penicillamine-histidine bifunctional graphene quantum dots.
[0053] Measure the fluorescence intensity of the prepared DPA-GQD-His, the results are as follows Image 6 as shown, Image 6 The middle line from bottom to top corresponds to the preparation of D-penicillamine and citric acid with a molar ratio of 0.1:1, 0.2:1, 0.3:1, 0.7:1, 0.4:1, 0.6:1, and 0.5:1, respectively. The resulting fluorescence intensity of DPA-GQD-His. It can be found that with the increase of D-penicillamine incorporati...
Embodiment 3
[0054] The preparation of embodiment 3DPA-GQD-His
[0055] When the reaction temperature in Example 1 is 200°C, and the molar ratio of citric acid, histidine, and D-penicillamine is 1:1:0.5, the time for controlling the hydrothermal reaction is 0.5h, 1h, 2h, 3h, 4h, 5h, 6h, and the rest of the operation steps were the same as in Example 1, and different DPA-GQD-His D-penicillamine-histidine bifunctional graphene quantum dots were prepared.
[0056] Measure the fluorescence intensity of the prepared DPA-GQD-His, the results are as follows Figure 7 as shown, Figure 7 The middle lines from bottom to top correspond to the fluorescence intensities of DPA-GQD-His prepared with reaction times of 6h, 5h, 4h, 3h, 0.5h, 2h, and 1h, respectively. It can be found that the fluorescence intensity of DPA-GQD-His reaches the maximum when the reaction time is 1 h.
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