بدون زمان بندی
نویسندگان: Ghazaal Behjati , Maryam Farahmand Habibi, Majid Arvand
زمان بندی: بدون زمان بندی
خلاصه مقاله: A novel photoelectrochemical (PEC) aptasensor based on polydopamine (PDA) coated titanium dioxide nanotube (TiO2 NTs)....
A novel photoelectrochemical (PEC) aptasensor based on polydopamine (PDA) coated titanium dioxide nanotube (TiO2 NTs) (PDA@TiO2 NTs) was designed, which exhibits enhanced PEC intensity compared with pure TiO2 NTs and PDA. In this scenario, ascorbic acid (AA) was exploited as an efficient and non-poisonous electron donor for scavenging photogenerated holes. The converting titanium to TiO2 NTs promoted its visible light absorption range and facilitated the charge transfer rate as well as hindered the h+/e‒ recombination. Moreover, the combination of PDA further promoted the electron carrier separation and transfer process due to its excellent electron collection and shuttling characteristic. Thus, the PDA@TiO2 NTs heterostructure was successfully served as a matrix for the PEC detection of aflatoxin B1 (AFB1) at 0.2 V (vs Ag/AgCl). Under optimal conditions, the PEC aptasensor could offer a sensitive and specific detection limit, as well as acceptable storage stability, which opened up a promising pathway for the development of PEC biosensors.