Fabrication of photoelectrochemical sensors based on multi-level nano-zinc oxide microsphere composites
A nano-zinc oxide, photoelectrochemical technology, applied in the direction of material electrochemical variables, scientific instruments, analytical materials, etc., can solve the problems of cumbersome steps, long detection cycle, low sensitivity, etc., and achieve simple operation, low detection limit, and improved sensitivity Effect
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Embodiment 1
[0043] Embodiment 1 prepares ZnO / Ru(bpy) 3 2+ The specific steps of / Ce-CdS are:
[0044] (1) Dissolve 2 mmol of zinc sulfate heptahydrate, 8 mmol of urea and 0.4 mmol of trisodium citrate in 43 mL of deionized water, stir magnetically for 30 min to form a uniform neutral solution, and place the mixture in 100 mL of polytetrafluoroethylene Reaction in vinyl fluoride autoclave at 120°C for 6 h, the precipitate was centrifugally washed, dried in a vacuum oven for 10 h, and the obtained solid was calcined in a muffle furnace at 300°C for 2 h to finally produce multi-level nano Zinc oxide microspheres are placed in ultrapure water to obtain a ZnO suspension;
[0045] (2) Cut the ITO electrode to a size of 2.5 cm × 0.8 cm, ultrasonically clean it with detergent, acetone, ethanol and ultrapure water for 30 min, and dry it with nitrogen, then modify the ITO electrode with 10 µL of ZnO suspension , and dried at room temperature to obtain an ITO / ZnO electrode;
[0046] (3) The surf...
Embodiment 2
[0047] Example 2 Preparation of ZnO / Ru(bpy) 3 2+ The specific steps of / Ce-CdS are:
[0048] (1) Dissolve 3 mmol of zinc sulfate heptahydrate, 12 mmol of urea and 0.6 mmol of trisodium citrate in 64 mL of deionized water, stir magnetically for 30 min to form a uniform neutral solution, and place the mixture in 100 mL of polytetrafluoroethylene React in a vinyl fluoride autoclave at 120°C for 6 h, wash the precipitate by centrifugation, dry it in a vacuum oven for 12 h, and place the resulting solid in a muffle furnace for calcination at 300°C for 2 h to finally produce a multi-level nano Zinc oxide microspheres are placed in ultrapure water to obtain a ZnO suspension;
[0049] (2) Cut the ITO electrode to a size of 2.5 cm × 0.8 cm, ultrasonically clean it with detergent, acetone, ethanol and ultrapure water for 30 min, and dry it with nitrogen, then modify the ITO electrode with 10 µL of ZnO suspension , and dried at room temperature to obtain an ITO / ZnO electrode;
[0050...
Embodiment 3
[0051] Example 3 Preparation of ZnO / Ru(bpy) 3 2+ The specific steps of / Ce-CdS are:
[0052] (1) Dissolve 3.75 mmol of zinc sulfate heptahydrate, 15 mmol of urea, and 0.75 mmol of trisodium citrate in 80 mL of deionized water, stir magnetically for 40 min to form a uniform neutral solution, and place the mixture in 100 mL of polytetrafluoroethylene React in an ethylene high-pressure reactor at 120°C for 6 h, wash the precipitate by centrifugation, dry it in a vacuum oven for 12 h, and place the resulting solid in a muffle furnace for calcination at 300°C for 2 h to finally produce a multi-level nano-oxidized Zinc microspheres are placed in ultrapure water to obtain a ZnO suspension;
[0053] (2) Cut the ITO electrode to a size of 2.5 cm × 0.8 cm, ultrasonically clean it with detergent, acetone, ethanol, and ultrapure water for 30 min, and dry it with nitrogen, then modify the ITO electrode with 10 µL of ZnO suspension , and dried at room temperature to obtain an ITO / ZnO ele...
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