Fluorescent nanometer probe for detecting hydrogen sulfide and preparation method and application of fluorescent nanometer probe
A fluorescent probe, hydrogen sulfide technology, applied in the field of analysis, can solve the problems of cost increase, waste of organic liquid phase, etc., and achieve the effect of simple preparation
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[0043] Example 1
[0044] The first step, preparation and characterization of precursors
[0045] (a) Preparation of carbon quantum dots: Place 1g of Tris powder in a 10mL beaker, heat it to 230°C with a heating mantle and keep it for 20 minutes to melt it. When the melt changes from colorless to deep red, take it out and place it for a second time. Dilute in water. Use a fluorescence spectrophotometer to detect the fluorescence intensity of the system composed of secondary water and Tris, and continue to add water until the fluorescence intensity of the system reaches the maximum value and stop adding the secondary water to obtain nitrogen-containing carbon quantum dots, that is, CQDs. The pH is 10.
[0046] Characterization of CQDs: Use transmission electron microscope to characterize CQDs, and the results are as follows figure 2 Shown in A. It can be seen from the figure that CQDs are uniformly distributed in the water phase and have uniform particle size. According to statis...
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[0057] Example 2
[0058] Keep the steps in Example 1 unchanged, fix the volume ratio of the aqueous solution of CQDs and AgNPs at 2:1, and only control the pH of CQDs at 7 experimental values between 1-14: 1, 4, 6, 7, 8 , 10, 14 in order to optimize the experimental conditions for detecting hydrogen sulfide, so that Na 2 S is completely converted to H 2 S.
[0059] Use a fluorescence spectrophotometer to test the emission spectra of each sample under 350nm excitation, and record the fluorescence intensity value at the maximum emission position at 440nm, and then plot it with the pH value, such as Figure 4 B shows the effect of pH on CQDs (a) and CQDs-AgNPs nanoprobes (b). Each point is the fluorescence emission spectrum intensity at 440nm; curve c is the addition of 100nM to each 1mL sample of curve b Na 2 After 100μL of S solution, the intensity of the fluorescence emission spectrum at 440nm.
[0060] It can be seen from the figure that Na is added to the CQDs-AgNPs nanoprobe. ...
Example Embodiment
[0065] Example 3
[0066] Keep the steps in Example 1 unchanged, only adjust the pH of the probe to 7 and control the volume ratio of CQDs to the aqueous solution of nano-silver to 9 experimental values between 1000:1 and 2:5: 100: 1, 50:1, 20:1, 10:1, 5:1, 2:1, 5:4, 1:1, 2:3, 1:2, 2:5.
[0067] Use a fluorescence spectrophotometer to test the emission spectrum of each sample under excitation at 350nm, and record the fluorescence intensity value F at the maximum emission position at 440nm 1 , And compare it with the initial value of CQDs F a Subtract to get the fluorescence quenching difference ΔF=F a -F 1 , And then plot the ratio of ΔF to CQDs and AgNPs. Such as Figure 4 As shown in A, and analyzed to get the following conclusions:
[0068] When CQDs occupies a large proportion, the quenching effect is not obvious; when the proportion of AgNPs is greater than CQDs, the quenching effect becomes stable.
[0069] Therefore, the optimal ratio of nitrogen-containing carbon quantum do...
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