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
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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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