title: Au Nanoparticles Decorated TiO2 Nanotube Arrays as a Recyclable Sensor for Photoenhanced Electrochemical Detection of Bisphenol A.
abstract: A photorefreshable and photoenhanced electrochemical sensing platform for bisphenol A (BPA) detection based on Au nanoparticles (NPs) decorated carbon doped TiO2 nanotube arrays (TiO2/Au NTAs) is described. The TiO2/Au NTAs were prepared by quick annealing of anodized nanotubes in argon, followed by controllable electrodeposition of Au NPs. The decoration of Au NPs not only improved photoelectrochemical behavior but also enhanced electrocatalytic activities of the resulted hybrid NTAs. Meanwhile, the high photocatalytic activity of the NTAs allowed the electrode to be readily renewed without damaging the microstructures and surface states after a short UV treatment. The electrochemical detection of BPA on TiO2/Au NTAs electrode was significantly improved under UV irradiation as the electrode could provide fresh reaction surface continuously and the further increased photocurrent resulting from the improved separation efficiency of the photogenerated electron-hole pairs derived from the consumption of holes by BPA. The results showed that the refreshable TiO2/Au NTAs electrode is a promising sensor for long-term BPA monitoring with the detection limit (S/N = 3) of 6.2 nM and the sensitivity of 2.8 μA·μM(-1)·cm(-2).
authors.affiliation: Department of Biomedical Sciences, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.|Department of Applied Biology and Chemical Technology, and the State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong.
authors.forename: Liangsheng
authors.initials: L
authors.lastname: Hu
authors.affiliation: Department of Biomedical Sciences, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.|Key Laboratory of Biochip Technology, Shenzhen Biotech and Health Centre, City University of Hong Kong , Shenzhen 518057, People's Republic of China.|State Key Laboratory in Marine Pollution, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.
authors.forename: Chi-Chun
authors.initials: CC
authors.lastname: Fong
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.
authors.forename: Xuming
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Biomedical Sciences, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.|State Key Laboratory in Marine Pollution, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.
authors.forename: Leo Lai
authors.initials: LL
authors.lastname: Chan
authors.affiliation: State Key Laboratory in Marine Pollution, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.
authors.forename: Paul K S
authors.initials: PK
authors.lastname: Lam
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.
authors.forename: Paul K
authors.initials: PK
authors.lastname: Chu
authors.affiliation: Department of Applied Biology and Chemical Technology, and the State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong.
authors.forename: Kwok-Yin
authors.initials: KY
authors.lastname: Wong
authors.affiliation: Department of Biomedical Sciences, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.|Key Laboratory of Biochip Technology, Shenzhen Biotech and Health Centre, City University of Hong Kong , Shenzhen 518057, People's Republic of China.|State Key Laboratory in Marine Pollution, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon, Hong Kong.
authors.forename: Mengsu
authors.initials: M
authors.lastname: Yang
mesh_terms: D001559:Benzhydryl Compounds / Q000032:analysis*; D002244:Carbon / Q000737:chemistry; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D006046:Gold / Q000737:chemistry; D057230:Limit of Detection; D053758:Nanoparticles / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D010636:Phenols / Q000032:analysis*; D014025:Titanium / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D002244:Carbon; D006046:Gold; D010636:Phenols; D014025:Titanium; C009495:titanium dioxide; C006780:bisphenol A; D000098826:Bisphenol A Compounds