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

Abstract

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 [KNbO][BaNiNbO] (KBNNO), the ferroelectric perovskite oxides were prepared by solid-state synthesis, while the TiO nanorod (NR) arrays were obtained via a hydrothermal method. Using the technique of pulsed laser deposition (PLD), KBNNO were then deposited on TiO NRs to form KBNNO@TiO 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@TiO 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.

Ti3C2 MXene-based Schottky photocathode for enhanced photoelectrochemical sensing

“…Potential photoelectrode candidates should possess highly valid light harvesting, suitable analytes interfacing, efficient PEC signal response, and stable signal transduction to exploit ideal PEC sensing platform [4][5][6]. Up to now, plentiful efforts are focused on developing photoactive materials to obtain desirable photoelectrode, such as TiO 2 -based or quantum dots-based nanomaterials, as well as porphyrin and its derivatives [7,8]. As a matter of fact, advanced heterostructure of various components that formulates Schottky junction can be conducive to carrier generation, and transfer, thus acquiring astonishing performance [9,10].…”

Modulating Charge Carrier Efficient Separation Enabled by Lewis Base Modification in Paper‐based Photoelectrochemical Sensor

“…Up to date, diverse semiconductors, such as TiO 2 [17,18], ZnO [19,20] and CdS [16,21] have been developed in the PEC sensor. Among them, featuring with the characteristics of excellent photoelectric performance, nontoxicity and biocompatibility, TiO 2 have been extensively investigated as effective photoactive material.…”

Platinum and Iridium Oxide Co-modified TiO2 Nanotubes Array Based Photoelectrochemical Sensors for Glutathione

“…Photoelectrochemical (PEC) detection is a rapidly developing technique, due to its characteristics of high sensitivity, fast response speed, and simple instrumentation [1][2][3][4][5][6], and attracts a lot of research attention for detection of biomolecules, such as NADH, glucose, and glutathione, which are closely related to many serious diseases [7]. In PEC biosensors, photocurrent is produced by the physical and chemical interactions between biomolecules; photoactive species are identified as detection signal.…”