Preparation method of photoelectric active material of multi-quantum-dot sensitized TiO2

Abstract

The invention discloses a preparation method of a photoelectric active material of multi-quantum-dot sensitized TiO2. The preparation method comprises the following steps: transferring thioglycolic acid TGA into ultrapure water containing Cd (AC)2. 2H2O under the condition of introducing N2 to obtain a mixed solution A; then adjusting the pH value of the mixed solution A to 10 by using NaOH, which is accompanied by the change of the solution from turbid to clear, wherein a mixed solution B is obtained at the moment; adding trisodium citrate and Na2TeO3 into the mixed solution B, then injecting NaBH4 and conducting bubbling for 10 minutes by using N2; and transferring the solution in the step 3 into a reaction kettle for reaction to obtain yellow CdTe QDs, and storing the yellow CdTe QDs at 4 DEG C. The method disclosed by the invention has the beneficial effects that the CdS QDs and the CdTe QDs are adopted to co-sensitize TiO2, a CdS QDs / CdTe QDs / TiO2 NPs composite material is successfully prepared, and due to a stepped energy level structure among the three materials, the absorption of visible light is remarkably enhanced under the excitation of the visible light, the service life of a carrier is prolonged, the separation of photo-generated electron holes is effectively promoted, and photoelectric conversion efficiency and stability are remarkably improved.

Description

technical field [0001] The invention relates to a method for preparing a photoelectric active material, specifically a multi-quantum dot sensitized TiO 2 The invention discloses a method for preparing a photoelectric active material, belonging to the technical field of photoelectric active materials. Background technique [0002] Photoelectrochemical sensors are analytical methods that determine the concentration of analytes based on the photoelectric conversion characteristics of substances. The method has the advantages of low background signal, high sensitivity, simple equipment, and low cost. Photoactive materials are one of the important elements of photoelectrochemical sensors, and their photoelectric conversion efficiency directly reflects the magnitude of the photocurrent, which has an important impact on the detection sensitivity of the sensor. [0003] In order to make photoelectrochemical sensors with higher sensitivity, people have been devoting themselves to r...

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Problems solved by technology

[0006] The object of the present invention is to provide a kind of multi-quantum dot sensitized TiO Photoelectric active material preparation method, in order to solve TiO in the prior art 2 The photoelectric conversion efficiency of the sensitized photoelectric material is low, the stability is poor, and the preparation method is complicated. The present invention uses CdS QDs and CdTe QDs to co-sensitize TiO 2 , successfully prepared CdS QDs / CdTe QDs / TiO 2 NPs composite material, due to the stepped energy level structure among the three materials, significantly enhances the absorption of visible light under visible light excitation, increases the carrier lifetime, effectively promotes the separation of photogenerated electrons and holes, and significantly improves the photoelectric conversion efficiency and stability. sex

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