Chemical preparation method of cdte quantum dot fluorescent probe for detection of trace paraquat
A fluorescent probe and quantum dot technology, applied in the field of material science, can solve the problems of limiting the number of fluorescent probes, narrow excitation spectrum, and killing
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[0044] A chemical preparation method for a CdTe quantum dot fluorescent probe for detecting trace amounts of paraquat, including modifying the surface of the CdTe quantum dot fluorescent probe with a red emission band to thioglycolic acid (TGA) to make the surface With carboxyl functional groups, it is characterized in that: the surface of the CdTe quantum dots has carboxyl groups, the negatively charged carboxyl groups on the surface and the positively charged target molecule paraquat through the electrostatic interaction of positive and negative charges, when the CdTe quantum dots and the target The molecular paraquat is close to each other in space. Through the principle of fluorescence resonance energy transfer, the emission spectrum of the CdTe quantum dot fluorescent probe is a red emission band that can be absorbed by the green target molecule paraquat. Using the change of the fluorescence intensity of the CdTe quantum dots, the realization For the detection of trace par...
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[0048] Example: According to the interaction of positive and negative charges, using the prepared CdTe quantum dots as a support, a two-step reaction can be used to obtain a CdTe quantum dot fluorescent probe rich in carboxyl groups on the surface.
[0049] 1.1 The first step is the preparation of purple transparent NaHTe solution: First, weigh 0.12 g ~ 0.13 g tellurium powder and 0.07 g ~ 0.09 g sodium borohydride respectively, put them in a 50 mL three-necked flask, and then use a 1 mL micro injection Add 2 mL~4 mL deionized water to a 50 mL three-necked flask, and react at 25°C in a helium atmosphere until the black tellurium powder disappears, and a purple transparent NaHTe solution is obtained;
[0050] 1.2 The second step is to modify the surface of the red CdTe quantum dot fluorescent probe with thioglycolic acid in the emission spectrum: weigh 0.4 g ~ 0.5 g CdCl 2 2.5H 2 Dissolve O in a 50 mL three-neck flask, add 20 mL ~ 25 mL deionized water, sonicate for 3 ~ 5 minu...
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