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نویسندگان: Seyyedeh Mahdiye Khatami, Maryam Farahmand Habibi, Majid Arvand

زمان بندی: بدون زمان بندی

یونیت نمایش:

برچسب: Nanochemistry

کد: GP-72836

خلاصه مقاله: In this research, we goal to design a simple and effective photoelectrochemical (PEC) sensor using the Ag@SnO2....

In this research, we goal to design a simple and effective photoelectrochemical (PEC) sensor using the Ag@SnO2 nanoparticles (Ag@SnO2 NPs) coated on the surface of titanium dioxide nanotube arrays (TiO2 NTs) as the optoelectronic material. The suggested sensor with a remarkable ultraviolet (UV) light photoelectrocatalytic activity, was utilized for the determination of quercetin (Qu) as a flavonoid without any auxiliary biomolecules or labeled materials. At first, TiO2 NTs were synthesized by anodizing process in an organic medium containing ethylene glycol, ammonium fluoride and water, followed by calcination in the furnace. Afterward, Ag@SnO2 NPs was coated on TiO2 NTs. The maximum optical current response for the Ag@SnO2 NPs/ TiO2 NTs (41.5 µA) is about 2.6 times higher than the pure TiO2 NTs electrode (15.5 µA). The addition of Qu led to an enhancing of the PEC response of the Ag@SnO2 NPs/TiO2 NTs electrode due to the presence of Qu as a sacrificial electron donor to scavenge the hole and inhibit the recombination of photogenerated electron–hole pairs. Under the optimum conditions, the designed PEC sensor exhibited a good linear range of Qu concentrations from 4‒124 nM and 124‒3600 nM with a detection limit (S/N=3) of 1.2 nM. Moreover, the as-fabricated PEC sensor exhibited an outstanding analytical performance with a high sensitivity, excellent selectivity, good stability and reproducibility.


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