Synthesis method and application of cadmium telluride quantum dots

Abstract

The invention discloses a synthesis method and application of cadmium telluride quantum dots, and relates to the technical field of quantum dot synthesis, and the technical key point is that the synthesis method comprises the following steps: S1, preparing a potassium hydrogen telluride solution; s2, synthesizing cadmium telluride quantum dots CdTeQDs: taking a 250 mL three-necked bottle, sequentially adding 1 mL of a CdCl2 solution with the concentration of 0.1 mol.L <-1 >, 180 mL of deionized water and thioglycollic acid (TGA), fully mixing, adjusting the pH value of the solution in the three-necked bottle to 8.6-10.2 by using 1.0 mol.L <-1 > NaOH, introducing nitrogen to remove oxygen for 30 minutes, rapidly adding 0.125-0.750 mL of a newly prepared potassium hydrogen telluride solution into the three-necked bottle, and heating and refluxing at the temperature of 100 DEG C for 3.0-5.5 hours to prepare a cadmium telluride quantum dot CdTeQDs solution. By optimizing and improving synthesis conditions such as the addition amount of synthesis raw materials and synthesis heating reflux time, the synthesized cadmium telluride quantum dots are good in stability and high in fluorescence quantum yield; meanwhile, the synthesized cadmium telluride quantum dots are high in detection sensitivity when being used for detecting the copper ions in the water body.

Description

technical field [0001] The invention relates to the technical field of quantum dot synthesis, in particular to a synthesis method and application of cadmium telluride quantum dots. Background technique [0002] Quantum Dots, also known as Semiconductor Nanocrystals, are a kind of luminescent nanoparticles. Compared with traditional organic fluorescent dyes, quantum dots have excellent optical properties such as high fluorescence quantum yield and good photochemical stability, and are a kind of fluorescent probe with great development potential. [0003] Nowadays, the research and application of quantum dots as fluorescent probes has become the focus of research, and has rapidly promoted the development of quantum dots in various research fields, such as chemical and biological analysis, medical diagnosis and other fields. In recent years, due to its simple synthesis method, low cost and good biocompatibility, aqueous quantum dots have been used as fluorescent markers in gen...

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Problems solved by technology

[0004] In the prior art, regarding the synthesis method of cadmium telluride quantum dots, there is a method of preparing cadmium telluride quantum dots through the aqueous phase synthesis method, and the step of preparing tellurium source (potassium telluride solution) usually requires tellurium powder and boron Sodium hydride reacts at room temperature for more than 3 hours, which takes a long time

The traditional aqueous phase synthesis method is carried out under normal pressure reflux conditions, the reaction time is long, the half-maximum width of the obtained quantum dots is large, and the quantum yield is low; at the same time, the stability and fluorescence performance of the synthesized cadmium telluride quantum dots are weak

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