MOF-Based Biomimetic Enzyme Microrobots for Efficient Detection of Total Antioxidant Capacity of Fruits and Vegetables.

Green and efficient total antioxidant capacity (TAC) detection is significant for healthy diet and disease prevention. This work first proposed the concept of TAC colorimetric detection based on microrobots. A novel metal-organic framework (MOF)-based biomimetic enzyme microrobot (MIL-88A@FeO) is developed that can efficiently and accurately detect the TAC of real fruits and vegetables.

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.