Quantum dot fluorescent probe for pH detection as well as preparation method and application of quantum dot fluorescent probe
A technology of fluorescent probes and quantum dots is applied in the field of preparation of bismuth oxysulfide nanocrystals, which can solve the problems of reducing ion fluorescence intensity and reducing the electronegativity of nanocrystal surfaces.
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[0025] Example
[0026] (1) Add 0.84 millimoles of bismuth acetate, 0.06 millimoles of europium acetylacetonate, 0.1 millimoles of calcium acetate, and 5 milliliters of oleic acid into a 50 milliliter three-necked flask at room temperature. The temperature is raised to 110°C and kept for 1 hour;
[0027] (2) After the solution in step (1) is cooled to below 50°C, add 10 millimoles of sulfur powder, 20 ml of oleylamine, and vacuum the three-necked flask with a mechanical pump for about 10 minutes, then heat to 120°C, and Keep the temperature for 30 minutes, then under the protection of argon, quickly raise the temperature to 310℃ and keep it for 1 hour;
[0028] (3) After the solution in step (2) is cooled to room temperature, ethanol is added to centrifuge to obtain a precipitate, and the product is washed with a 3:1 mixture of ethanol: cyclohexane, and then dried at 40 ℃ to obtain the final product.
[0029] (4) Sonicate the nanocrystals obtained in step (3) with a hydrochloric acid ...
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