Multiferroic properties and giant piezoelectric effect of a 2D Janus WOF monolayer.

Materials possessing both ferroelectricity and ferromagnetism are regarded as ideal candidates for electronic devices, such as nonvolatile memories. Based on first-principles calculations, we systematically studied the crystal structure, electronic structure as well as magnetic, piezoelectric and ferroelectric properties of a two-dimensional van der Waals WOF monolayer material. The WOF monolayer was found to possess a robust square crystal structure, exhibiting exceptional stability and mechanical resilience.

Nitrogen Vacancy Modulation of Tungsten Nitride Peroxidase-Mimetic Activity for Bacterial Infection Therapy.

Bacterial infections claim millions of lives every year, with the escalating menace of microbial antibiotic resistance compounding this global crisis. Nanozymes, poised as prospective substitutes for antibiotics, present a significant frontier in antibacterial therapy, yet their precise enzymatic origins remain elusive. With the continuous development of nanozymes, the applications of elemental N-modulated nanozymes have spanned multiple fields, including sensing and detection, infection therapy, cancer treatment, and pollutant degradation.

Electrochemical sensing mechanisms of neonicotinoid pesticides and recent progress in utilizing functional materials for electrochemical detection platforms.

The excessive residue of neonicotinoid pesticides in the environment and food poses a severe threat to human health, necessitating the urgent development of a sensitive and efficient method for detecting trace amounts of these pesticides. Electrochemical sensors, characterized by their simplicity of operation, rapid response, low cost, strong selectivity, and high feasibility, have garnered significant attention for their immense potential in swiftly detecting trace target molecules. The detection capability of electrochemical sensors primarily relies on the catalytic activity of electrode materials towards the target analyte, efficient loading of biomolecular functionalities, and the effective conversion of interactions between the target analyte and its receptor into electrical signals.

Nanozyme-Enhanced Electrochemical Biosensors: Mechanisms and Applications.

Nanozymes, as innovative materials, have demonstrated remarkable potential in the field of electrochemical biosensors. This article provides an overview of the mechanisms and extensive practical applications of nanozymes in electrochemical biosensors. First, the definition and characteristics of nanozymes are introduced, emphasizing their significant role in constructing efficient sensors.

A novel two-dimensional NiClO lattice with negative Poisson's ratio and magnetic modulation.

Two-dimensional (2D) materials with simultaneous magnetic semiconducting properties and a negative Poisson's ratio are crucial for fabricating multifunctional electronic devices. However, progress in this area has been generally constrained. Based on first-principles calculations, we engineered a 2D Ni-based oxyhalide with a honeycomb lattice structure.

Photosensitive Peptide Enabling Molecular Recognition Tandem Covalent Biosensing for Evaluating and Preventing Venous Thromboembolism in Dravet Syndrome.

Venous thromboembolism (VTE) is a complication of Dravet syndrome, accounting for many unexpected deaths. To control VTE more tightly and to prevent such tragedies, a reliable and low-cost risk evaluation assay is urgently needed, so that the daily routine of VTE risk evaluation can be established. In this work, we have developed such an assay combining the photocatalytic activity of Bengal red to trigger the target-specific self-splicing of a peptide probe and subsequent cross-linking with P-selectin.

Recent Development of Copper-Based Nanozymes for Biomedical Applications.

Copper (Cu), an indispensable trace element within the human body, serving as an intrinsic constituent of numerous natural enzymes, carrying out vital biological functions. Furthermore, nanomaterials exhibiting enzyme-mimicking properties, commonly known as nanozymes, possess distinct advantages over their natural enzyme counterparts, including cost-effectiveness, enhanced stability, and adjustable performance. These advantageous attributes have captivated the attention of researchers, inspiring them to devise various Cu-based nanomaterials, such as copper oxide, Cu metal-organic framework, and CuS, and explore their potential in enzymatic catalysis.

Piezoelectric Effect Modulates Nanozyme Activity: Underlying Mechanism and Practical Application.

Nanozyme activity relies on surface electron transfer processes. Notably, the piezoelectric effect plays a vital role in influencing nanozyme activity by generating positive and negative charges on piezoelectric materials' surfaces. This article comprehensively reviews the potential mechanisms and practical applications of regulating nanozyme activity through the piezoelectric effect.

Full Solar-Spectrum-Driven Antibacterial Therapy over Hierarchical Sn O /PDINH with Enhanced Photocatalytic Activity.

Antibacterial photocatalytic therapy (APCT) is considered to be a potential treatment for administrating antibiotic-resistant bacteria. However, due to the low photocatalytic efficiency and weak ability to capture bacteria, it is not practically applied. In this work, an organic-metal oxide hybrid semiconductor heterostructure is fabricated for the photocatalytic generation of reactive oxygen species (ROS) to kill the drug-resistant bacteria.

Spin-Gapless States in Two-Dimensional Molecular Ferromagnet Fe(TCNQ).

Two-dimensional van der Waals magnetic atomic crystals have provided unprecedented access to magnetic ground states due to a quantum confinement effect. Here, using first-principles calculations, we demonstrate a spin-gapless molecular ferromagnet, namely, Fe(TCNQ), with superior mechanical stability and a remarkable linear Dirac cone, which can be exfoliated from its already-synthesized van der Waals crystal. Especially, Young's modulus has values of 175.

CeO₂ Nanocrystal Decorated TiO₂ Nanobelt with Enhanced Photocatalytic Performance.

In this work, CeO₂ nanocrystal-decorated TiO₂ nanobelt for forming a CeO₂@TiO₂ heterostructure. CeO₂ plays a dual role in improving photocatalytic activity, not only by promoting the separation and transfer of photogenerated charge carriers, but also by increasing visible light absorption of the photocatalyst as a photosensitizer. The as-prepared CeO₂@TiO₂ heterostructure demonstrates the performance of organic degradation and H₂ production (about 17 mol/h/g, which is about 2.

Enhanced Antibacterial Photocatalytic Activity of Porous Few-Layer C₃N₄.

Nowadays, antibacterial photocatalytic activity of semiconductors has attracted great attention due to its excellent stability, good biocompatibility and no disinfection byproducts. Herein, a porous few-layer C₃N₄ was successfully fabricated via a simple and low-cost bottom-up method. The asprepared porous few-layer C₃N₄ exhibits large specific surface areas, which is about 4.

An "off-on" fluorescent sensor for copper ion using graphene quantum dots based on oxidation of l-cysteine.

A simple and highly efficient "off-on" fluorescent sensor based on grapheme quantum dots (GQDs) for Cu was developed. In this sensing platform, the fluorescence of GQDs was quenched in the presence of 2,4-dinitrophenylcysteine (DNPC), which is the reaction product of 1-chloro-2,4-dinitrobenzene (CDNB) and l-cysteine, owing to the spectral overlap between the absorption of DNPC and the excitation of GQDs. In the presence of Cu, l-cysteine was catalytically oxidized to l-cystine by O, resulting in the reduction of DNPC.

TiO/TiN core/shell nanobelts for efficient solar hydrogen generation.

TiO2/TiN core/shell NBs are successfully synthesized, and used as highly efficient photocatalytic H2 evolution catalysts (120 μmol h-1 g-1) from methanol solution. The TiN shell plays dual roles by extending the light absorption range and also promoting the separation/transfer of photoexcited charge carriers as an electron collector.

Fluorescent carbon dots nanosensor for label-free determination of vitamin B based on inner filter effect.

A simple and effective fluorescent assay for the determination of vitamin B was developed. In this study, carbon dots (CDs) were prepared by one-pot hydrothermal method and directly used as a fluorophore in the inner filter effect (IFE). Both of the maximum absorption peak of vitamin B and excitation maxima of CDs are located at 360nm, hence, the excited light of CDs can be absorbed by vitamin B, resulting in the fluorescence reduction of CDs.

Sensitive and rapid detection of microRNAs using hairpin probes-mediated exponential isothermal amplification.

MicroRNAs (miRNAs) play significant roles in a diverse range of biological progress and have been regarded as biomarkers and therapeutic targets in cancer treatment. Here, we develop a rapid and sensitive miRNA assay on the basis of exponential isothermal amplification in combination with the hairpin probes, which was designed for sensitive detection of miRNA. The binding of target miRNA with a linear DNA template initiates exponential isothermal amplification reaction (EXPAR) and generates the universal triggers which are complementary to the 3' protruding end of hairpin probe1(HP1).

Ultrathin Silica Membranes with Highly Ordered and Perpendicular Nanochannels for Precise and Fast Molecular Separation.

Membranes with the ability of molecular/ionic separation offer potential in many processes ranging from molecular purification/sensing, to nanofluidics and to mimicking biological membranes. In this work, we report the preparation of a perforative free-standing ultrathin silica membrane consisting of straight and parallel nanochannels with a uniform size (∼2.3 nm) for precise and fast molecular separation.

Highly ordered binary assembly of silica mesochannels and surfactant micelles for extraction and electrochemical analysis of trace nitroaromatic explosives and pesticides.

The rapid and sensitive detection of nitroaromatic compounds is of great significance for human health, the environment, and public security. The present work reports on the extraction and electrochemical analysis of trace nitroaromatic compounds, such as explosives and organophosphate pesticides (OPs), using the indium tin oxide (ITO) electrodes modified with a highly ordered and aligned binary assembly of silica mesochannels and micelles (BASMM). With a pore diameter of ca.

Gold nanoparticles confined in vertically aligned silica nanochannels and their electrocatalytic activity toward ascorbic acid.

A facile method of confining gold nanoparticles (AuNPs) in silica nanochannels aligned perpendicularly to an underlying electrode surface is reported. The nanochannel surface carrying a layer of (3-aminopropyl)triethoxy silane (APTS) displays a strong electrostatic interaction with AuCl4(-), eventually resulting in the confinement of AuNPs inside the nanochannels after chemical reduction. As-prepared AuNPs in APTS-modified mesoporous silica film (APTS-MSF) are highly dispersed with a narrow size distribution.

Differential pulse voltammetry detection of dopamine and ascorbic acid by permselective silica mesochannels vertically attached to the electrode surface.

A thin film consisting of highly ordered and vertically oriented silica mesochannels (SMCs) was prepared on the indium tin oxide (ITO) coated glass electrode surface by chronopotentiometry. The mesochannel has a uniform pore size of 2-3 nm in diameter and a positively charged surface due to grafted ammonium groups. The electrostatic and steric effects resulted from control of the surface charge and the ionic buffer concentration make the SMCs permselective, favoring the mass transport of oppositely charged species and repelling that of similarly charged ones.

Vertically oriented silica mesochannels as the template for electrodeposition of polyaniline nanostructures and their electrocatalytic and electroanalytical applications.

A mesoporous silica film (MSF) with vertically oriented mesochannels on a conductive substrate serves as a hard-template for electrodeposition of polyaniline (PANI). The PANI nanostructures thus prepared are orderly confined in silica mesochannels, eventually producing a robust hybrid film. The film displays a good electrocatalytic activity toward oxidation of ascorbic acid, and can be used for potentiometric pH sensing with a Nernstian response.

2,2'-[Pyridine-2,6-diylbis(carbonyl-hydrazono)]dipropanoic acid N,N-dimethyl-formamide disolvate.

The complete molecule of the title compound, C(13)H(13)N(5)O(6)·2C(3)H(7)NO, is generated by crystallographic twofold rotation with an N and a C atom lying on the axis. The structure is stabilized by inter-molecular O-H⋯O hydrogen bonds.

catena-Poly[[triphenyl-tin(IV)]-μ-2-(2-picolinoylhydrazono)propanoato-κO:O].

In the title polymeric coordination compound, [Sn(C(6)H(5))(3)(C(9)H(8)N(3)O(3))](n), the Sn(IV) atom is in a distorted trigonal-bipyramidal geometry, being coordinated by two O atoms from two 2-(2-picolinoylhydrazono)propanoate ligands and three phenyl groups. Adjacent Sn atoms are bridged by the 2-(2-picolinoylhydrazono)propanoate ligand through one carbonyl O atom and one carboxyl-ate O atom, forming a chain structure propagating parallel to [100]. An intra-molecular N-H⋯O hydrogen bond is observed.