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Preparation method and application of photoelectrochemical aflatoxin B1 sensor based on tungsten trioxide composite material

A kind of aflatoxin, photoelectrochemical technology, applied in the preparation and application field of photoelectrochemical aflatoxin B1 sensor based on tungsten trioxide composite material, can solve the problems of cumbersome steps, long detection cycle, low sensitivity, etc., to improve the sensitivity , Inhibit charge recombination and achieve sensitive detection

Active Publication Date: 2018-11-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of many factors on its quantitative determination, it has the disadvantages of low sensitivity, long detection cycle, cumbersome steps, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of WO 3 / TiO 2 / Ag 2 The specific steps of O are:

[0034] (1) Cut the FTO electrode to a size of 2.5 cm × 0.5 cm, immerse it in acetone, water, ethanol, and deionized water at 50 °C for 30 min, and then dry it in an electric blast drying oven at 70 °C for 140 min;

[0035] (2) Dissolve 0.6 g sodium tungstate and 0.2 g ammonium oxalate in 50 mL deionized water, add 14 mL hydrochloric acid under rapid stirring, the solution forms a suspension due to the precipitation of tungstic acid, and then continue to add 15 mL under stirring Hydrogen peroxide was reacted for 10 min, the suspension became a clear solution, and then 44 mL of ethanol was added under stirring for 10 min, and then the prepared FTO glass was immersed in the solution and heated in a water bath at 85 °C for 3 h to obtain the supported WO on FTO electrodes 3 nanosheets, the WO 3 The nanosheets were rinsed with a large amount of deionized water and dried in an oven at 50°C for 5 h, ...

Embodiment 2

[0038] Example 2 prepares WO 3 / TiO 2 / Ag 2 The specific steps of O are:

[0039] (1) Cut the FTO electrode to a size of 2.5 cm × 0.5 cm, immerse it in acetone, water, ethanol, and deionized water at 50 °C for 30 min, and then dry it in an electric blast drying oven at 70 °C for 140 min;

[0040] (2) Dissolve 1.2 g sodium tungstate and 0.4 g ammonium oxalate in 100 mL deionized water, add 28 mL hydrochloric acid under rapid stirring, the solution forms a suspension due to the precipitation of tungstic acid, and then continue to add 30 mL under stirring Hydrogen peroxide was reacted for 15 min, the suspension became a clear solution, and then 88 mL of ethanol was added under stirring for 15 min, and then the prepared FTO glass was immersed in the solution and heated in a water bath at 85 °C for 4 h to obtain the supported WO on FTO electrodes 3 nanosheets, the WO 3 The nanosheets were rinsed with a large amount of deionized water and dried in an oven at 50 °C for 6 h, anne...

Embodiment 3

[0043] Example 3 prepares WO 3 / TiO 2 / Ag 2 The specific steps of O are:

[0044] (1) Cut the FTO electrode to a size of 2.5 cm × 0.5 cm, immerse it in acetone, water, ethanol, and deionized water at 50 °C for 30 min, and then dry it in an electric blast drying oven at 70 °C for 140 min;

[0045] (2) Dissolve 0.6 g sodium tungstate and 0.2 g ammonium oxalate in 50 mL deionized water, add 14 mL hydrochloric acid under rapid stirring, the solution forms a suspension due to the precipitation of tungstic acid, and then continue to add 15 mL under stirring Hydrogen peroxide was reacted for 10 min, the suspension became a clear solution, and then 44 mL of ethanol was added under stirring for 10 min, and then the prepared FTO glass was immersed in the solution and heated in a water bath at 85 °C for 5 h to obtain the supported WO on FTO electrodes 3 nanosheets, the WO 3 The nanosheets were rinsed with a large amount of deionized water and dried in an oven at 50 °C for 5 h and an...

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PUM

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Abstract

The invention relates to a preparation method and application of a photoelectrochemical aflatoxin B1 sensor based on a tungsten trioxide composite material, and belongs to the field of photoelectrochemical sensors. The preparation method comprises the following steps: synthesizing a rectangular WO3 nanoflake on a fluorine doped tin oxide FTO substrate by using a wet chemical method; then closely combining TiO2 nano-thorn with a unique structure on the WO3 nanoflake by using a chemical bath deposition method; carrying out double matching between an energy band structure and a lattice structureof WO3 and TiO2 to enhance the photoelectric response and stability of the WO3; then combining with upper p-type narrow bandgap semiconductor Ag2O nanoparticles by using an in situ growth method, thusobtaining the tungsten trioxide composite material WO3 / TiO2 / Ag2O composite material with remarkably improved photoelectric activity. The material shows excellent visible light activity in the presence of glutathione. An aflatoxin B1 antibody, bovine serum albumin and an aflatoxin B1 antigen are assembled into the WO3 / TiO2 / Ag2O composite material by using a layer-by-layer self-assembly method; ultra-sensitive detection of the aflatoxin B1 is realized by utilizing specific combination of excellent photoelectric activity of WO3 / TiO2 / Ag2O with an aflatoxin B1 antigen antibody, which is of great significance for analysis and detection of the aflatoxin B1.

Description

technical field [0001] The invention relates to a preparation method and application of a photoelectrochemical aflatoxin B1 sensor based on a tungsten trioxide composite material. An electrochemical workstation is used for testing with a three-electrode system, an LED lamp is used as a photoelectrochemical luminescence signal source, and a wet chemical method is used. Synthesis of rectangular WO on fluorine-doped tin oxide FTO substrate 3 Nanosheets, and then the unique structure of TiO by chemical bath deposition 2 The nanothorns are tightly combined in the WO 3 On nanosheets, better energy level matching effectively suppresses WO 3 Photogenerated electron-hole recombination on nanosheets. In situ growth method combined with p-type Ag 2 O nanoparticles, obtained tungsten trioxide composite material WO with significantly enhanced visible light absorption 3 / TiO 2 / Ag 2 O. with WO 3 / TiO 2 / Ag 2 O as the base material and glutathione as the electron donor, a photoele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/36G01N27/38
CPCG01N27/36G01N27/38
Inventor 鲍春竹范大伟刘昕张勇马洪敏吴丹王欢魏琴杜斌胡丽华
Owner UNIV OF JINAN
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