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Method for efficient detection of copper ions based on photo-assisted in-situ heterostructure

A heterogeneous structure, copper ion technology, applied in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve problems such as the application of unfavorable ion exchange reactions, and achieve the effects of wide detection range, easy process and simple operation.

Inactive Publication Date: 2020-10-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most ion exchange reactions need to be completed in a vacuum or ultrasonic environment, which is not conducive to the application of ion exchange reactions in biosensing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Light-assisted in-situ heterostructure construction for efficient detection of copper ions

[0016] (1) First cut the ITO glass into 0.6×1.0 cm 2 , after ultrasonication for 15 min each in acetone, ethanol and deionized water, followed by drying in a nitrogen stream;

[0017] (2) Dissolve 0.23g of cadmium nitrate tetrahydrate and 0.17g of thiourea in 60 mL of ethylenediamine, then place the solution in a 100 mL polytetrafluoroethylene reactor, and react at 160 °C for 24 h , collected the precipitate, and dried at 60 °C to prepare CdS nanorods after washing with water and absolute ethanol several times; then the ITO electrode was immersed in 2% polydiallyl dimethyl chloride containing 0.5 M sodium chloride Keep in the ammonium chloride solution for 15 min, then add 200 μL of the prepared CdS solution;

[0018] (3) Mix 1.5 mL of copper ion solutions with different concentrations and 1.5 mL of triethanolamine solution with a concentration of 0.58 M, then drop 1...

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Abstract

The invention discloses a method for efficient detection of copper ions based on a photo-assisted in-situ heterostructure. An ITO counter electrode is pretreated to enable the surface of the electrodeto have positive charges, and then CdS nanorods with negative charges are used to modified the surface of the electrode through electrostatic attraction of the positive charges and the negative charges. Based on this, copper ions with different concentrations are dropwise added to the surface of the electrode, under illumination, chromium ions of CdS can be recognized by the copper ions, and thenCdS is converted into a compound of CdS and copper sulfide to improve the photoelectric property greatly, so quantitative detection of the copper ions is achieved. The method has the advantages of simple operation, easy process control, few interference factors, smaller background signals and higher sensitivity, and provides an idea for trace detection of other metal ions.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, antigen detection technology and paper chip technology, more specifically, it is based on light-assisted in-situ heterogeneous structure construction for efficient detection of copper ions. Background technique [0002] As a newly developed analytical method, photoelectric technology has attracted extensive attention due to its advantages of high sensitivity, low cost, and rapid detection. Among numerous photoactive materials, CdS is widely used due to its 2.4 eV forbidden band width and wide light absorption range. However, its fast electron-hole recombination rate greatly limits its practical application. Improving the separation efficiency of photogenerated electrons by forming composite materials is an effective solution. [0003] Synthesis of materials by ion exchange has been extensively explored, especially in the preparation of nanoscale metal sulfides. However, most ion exchang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416G01N27/36B82Y40/00
CPCB82Y40/00G01N27/36G01N27/416
Inventor 史慧慧张彦于京华
Owner UNIV OF JINAN