A Branched Rutile/Anatase Phase Structure Electrode with Enhanced Electron-Hole Separation for High-Performance Photoelectrochemical DNA Biosensor.

A photoelectrochemical (PEC) detection platform was built based on the branched rutile/anatase titanium dioxide (RA-TiO) electrode. Theoretical calculations proved that the type-II band alignment of rutile and anatase could facilitate charge separation in the electrode. The self-generated electric field at the interface of two phases can enhance the electron transfer efficiency of the electrode.

High-performance Vo-ZnO/ZnS benefiting nanoarchitectonics from the synergism between defect engineering and surface engineering for photoelectrochemical glucose sensors.

In this study, a ZnO/ZnS nanocluster heterojunction photoelectrode rich in surface oxygen defects (Vo-ZnO/ZnS) was prepared by applying a simple anion substitution and nitrogen atmosphere annealing method. The synergism between defect and surface engineering significantly improved the photocatalysts. Given this synergism, Vo-ZnO/ZnS was endowed with a long carrier lifetime, narrow band gap, high carrier density, and high performance toward electron transfer under light conditions.

Carbon Dot-Modified Branched TiO Photoelectrochemical Glucose Sensors with Visible Light Response.

The development of a photoelectrochemical (PEC) sensor for the sensitive and rapid detection of glucose is highly desirable. In PEC enzyme sensors, inhibition of the charge recombination of electrode materials is an efficient technique, and detection in visible light can prevent enzyme inactivation due to ultraviolet irradiation. In this study, a visible light-driven PEC enzyme biosensor was proposed, using CDs/branched TiO (B-TiO) as the photoactive material and glucose oxidase (GOx) as the identification element.

growth of TiO/TiC MXene Schottky heterojunction as a highly sensitive photoelectrochemical biosensor for DNA detection.

In this work, a heterojunction composed of a TiO nanosheet and layered TiC was synthesized by directly growing TiO in TiC MXene. Compared with pure TiO, TiO/TiC composites had increased surface area, and a light absorption range that extended from ultraviolet to visible light, which greatly extended the life of photogenerated carriers. A photoelectrochemical biosensor for DNA detection was constructed based on the TiO/TiC heterogeneous structure, which was comprehensively studied based on photocurrent responses.

Boosting the Photocatalytic Ability of TiO Nanosheet Arrays for MicroRNA-155 Photoelectrochemical Biosensing by Titanium Carbide MXene Quantum Dots.

The electrodes of two-dimensional (2D) titanium dioxide (TiO) nanosheet arrays were successfully fabricated for microRNA-155 detection. The (001) highly active crystal face was exposed to catalyze signaling molecules ascorbic acid (AA). Zero-dimensional (0D) titanium carbide quantum dots (TiCT QDs) were modified to the electrode as co-catalysts and reduced the recombination rate of the charge carriers.

Gold and Platinum Nanoparticle-Functionalized TiO Nanotubes for Photoelectrochemical Glucose Sensing.

Developing stable photoelectrochemistry (PEC) glucose biosensors with high sensitivity and a low detection limit is highly desirable in the biosensor field. Herein, a highly sensitive and stable enzymatic glucose PEC biosensor is rationally designed and fabricated using a TiONTs/Au/Pt/GOx electrode. First, we prepared one-dimensional TiO nanotube arrays which could realize the orthogonalization of the light-incident direction and the carrier diffusion direction via anodization.

Enhanced photoelectrochemical biosensing performance for Au nanoparticle-polyaniline-TiO heterojunction composites.

A new photoelectrochemical (PEC) sensing platform comprising TiO nanotube arrays (TiONTAs), polyaniline (PANI), and gold nanoparticles (AuNPs) was successfully fabricated. After loading the enzyme, this Au-PANI-TiONTA electrode showed excellent response to glucose at a linear range of 2-36 mM with a 0.02 mM detection limit.