Light irradiation Mn:ZnSe@ZnS quantum dot photoelectric sensor as well as preparation method and application thereof

A photoelectric sensor and quantum dot technology, which is applied in the field of nano-photoelectric sensors in analytical chemistry, can solve the problems of fast electrochemical deposition, expensive biological reagents, and easy peeling of the surface film, and achieve wide detection pH range, shortened detection time, The effect of quantitative analysis and detection of environmental protection

Active Publication Date: 2020-08-21
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrochemical deposition method is too fast, and the surface film is easy to fall off, which affects the detection
Biological reagent-specific recognition method has good selectivity and high sensitivity, but biological reagents are expensive, the operation is relatively complicated, and the cycle is also long

Method used

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  • Light irradiation Mn:ZnSe@ZnS quantum dot photoelectric sensor as well as preparation method and application thereof
  • Light irradiation Mn:ZnSe@ZnS quantum dot photoelectric sensor as well as preparation method and application thereof
  • Light irradiation Mn:ZnSe@ZnS quantum dot photoelectric sensor as well as preparation method and application thereof

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Embodiment 1

[0044] A photoelectric sensor, from bottom to top, sequentially includes a conductive glass substrate, TiO 2 Layer, polydiallyl dimethyl ammonium chloride layer and Mn:ZnSe@ZnS core-shell quantum dot layer, the "core" of the core-shell quantum dots is Mn-doped ZnSe quantum dots, and the "shell" is the Irradiation of L-cysteine ​​releases S 2- Formed ZnS.

[0045] The preparation method of the photoelectric sensor of the present embodiment comprises the following steps:

[0046] (1) Preparation of Mn:ZnSe quantum dots (ZnSe quantum dots doped with Mn), the flow chart is as follows figure 1 Shown:

[0047] a) According to the molar ratio of sodium borohydride, selenium powder, zinc acetate and L-cysteine ​​in the precursor body liquid is 3:1:3:6, the molar fraction of manganese acetate is equivalent to zinc acetate is 10%, prepare raw materials;

[0048] b) Add 0.0211g of selenium powder, 0.0505g of sodium borohydride and 15mL of saturated deoxygenated ultrapure water into a...

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Abstract

The invention relates to a light irradiation Mn:ZnSe@ZnS quantum dot photoelectric sensor comprising a conductive glass substrate, a TiO2 layer, a PDDA layer and a Mn:ZnSe@ZnS core-shell quantum dot modification layer in sequence from bottom to top. The core of the core-shell quantum dot is a Mn-doped ZnSe quantum dot, and the shell of the core-shell quantum dot is ZnS formed by irradiating L-cysteine with ultraviolet light to release S<2->. The preparation method comprises the following steps: preparing the FTO/TiO2 electrode, dispensing the PDDA solution on the surface of the FTO/TiO2 electrode to form the FTO/TiO2/PDDA electrode, dispensing the Mn: ZnSe-ZnS core-shell quantum dot solution, and drying to obtain the photoelectric sensor. The photoelectric sensor disclosed by the inventionis wide in pH detection range (pH=5.5-13.4); the photocurrent of the electrode is stable under different pH conditions, the photocurrent in the neutral and strong alkaline solutions can be further enhanced, simple, accurate and environment-friendly quantitative analysis and detection of the lead ions in the neutral and strong alkaline solutions are realized, the detection limit is reduced to 3.2nM, and the detection time is shortened to be within 10s.

Description

technical field [0001] The invention belongs to the technical field of nano photoelectric sensors of analytical chemistry, and in particular relates to a photoirradiation Mn:ZnSe@ZnS quantum dot sensitized titanium dioxide photoelectric sensor and its preparation method and application. Background technique [0002] A photoelectrochemical (PEC) sensor is a type of detection device that measures the concentration of an analyte based on the photoelectric conversion characteristics of a photoelectrochemical active substance. It works by photoelectrochemical process. Compared with pure optical detection and electrical detection methods, photoelectrochemical detection methods have many advantages such as high sensitivity, simple equipment, and easy miniaturization. Provides new avenues. [0003] Quantum dots (QDs for short) have a unique photoelectric effect, which not only exhibits excellent fluorescence characteristics, but also converts light energy into electrical energy or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64C09K11/02C09K11/88C09K11/56B82Y20/00B82Y30/00B82Y40/00
CPCG01N21/6428C09K11/02C09K11/883C09K11/565B82Y20/00B82Y30/00B82Y40/00
Inventor 王琼黄自知陈秋菊文瑞芝袁丽萍胡云楚
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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