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Ferroelectric Perovskite Oxide@TiO2 Nanorod Heterostructures: Preparation, Characterization, and Application as a Platform for Photoelectrochemical Bioanalysis

Yu, Li-Min, Zhu, Yuan-Cheng, Liu, Yi-Li, Qu, Peng, Xu, Mao-Tian, Shen, Qi, Zhao, Wei-Wei
Analytical chemistry 2018 v.90 no.18 pp. 10803-10811
cysteine, hot water treatment, nanorods, titanium dioxide
This work reports the first synthesis and characterization of a ferroelectric perovskite oxide-based heterostructure as well as its application for photoelectrochemical (PEC) bioanalytical purposes. Specifically, exemplified by [KNbO₃]₁–ₓ[BaNi₁/₂Nb₁/₂O₃₋δ]ₓ (KBNNO), the ferroelectric perovskite oxides were prepared by solid-state synthesis, while the TiO₂ nanorod (NR) arrays were obtained via a hydrothermal method. Using the technique of pulsed laser deposition (PLD), KBNNO were then deposited on TiO₂ NRs to form KBNNO@TiO₂ NR heterostructures. Various characterization techniques were applied to reveal compositional and structural information on the as-fabricated sample, and favorable alignment existed between the two components as displayed by the PEC test. In the detection of l-cysteine, the as-fabricated KBNNO@TiO₂ NRs demonstrated good performance in terms of sensitivity and selectivity. This work revealed the potential of ferroelectric perovskite oxide and its heterostructures for innovative PEC bioanalytical applications, and we hope it will generate more interest in the development of various ferroelectrics-based heterostructures for advanced PEC bioanalysis.