Simultaneous Achievement of Enhanced Nonlinear Optical Absorption and Nonlinear Refraction in Highly Crystalline 2D Covalent Organic Frameworks Ultrathin Films.

Large enhancement of nonlinear absorption and nonlinear refraction are achieved simultaneously in highly ordered two dimensional (2D) covalent organic framework (COF) films prepared by solidliquid interface one-step method to overcome the weakness of COF powders in solubility. In the intrinsic nonlinear optical response obtained at 532 nm with 5 ns pulse, the nonlinear absorption coefficients (β) of two COF films are -4.87 × 10 and -1.

An Ultrasensitive Ethanol Gas Sensor Based on a Dual-Nanoparticle InO/SnO Composite.

As a VOC, ethanol can be found in human exhaled breath, and its concentration can be used as a biomarker of human liver disease. To detect trace-level concentrations of ethanol, an ultrasensitive ethanol sensor was developed based on a dual-nanoparticle InO/SnO composite that was prepared by hydrothermal synthesis, and its suspension was dipped on a flat electrode to form a gas sensor. The nanocomposite was characterized by an SEM (scanning electron microscope), XRD (X-ray diffraction), and a TEM (transmission electron microscope), and the nanoparticle structure was observed.

A new species of the genus Boulenophrys from South China (Anura, Megophryidae).

In this study, a new species of the genus Boulenophrys is described from northwestern Guangdong, within the Nanling Moutains. The new species can be distinguished from all known congeners by a combination of morphological characteristics and the mitochondrial genetic divergence. The new species is found to breed in winter season which was not common in most amphibian groups but also present in some Boulenophrys congeners.

Metal-Organic Framework-Derived Au-Doped InO Nanotubes for Monitoring CO at the ppb Level.

Achieving selective detection of ppb-level CO is important for air quality testing at industrial sites to ensure personal safety. Noble metal doping enhances charge transfer, which in turn reduces the detection limit of metal oxide gas sensors. In this work, metal-organic framework-derived Au-doped InO nanotubes with high electrical conductivity are synthesized by pyrolysis of the Au-doped metal-organic framework (In-MIL-68) as a template.

In Situ Fabrication of SnO Nanowalls for Robust Acetylene Sensing at Low Temperature.

Acetylene (C H ) monitoring in real time and online is essential for erasing transformer risks and guaranteeing normal equipment operation and operator safety. This study examines the direct fabrication of ultrathin SnO nanowalls on Ag-Pd substrates using a simple solvothermal method that doesn't demand the use of any additional motivators or templates. The thickness and shape of the nanowalls can be controlled by varying the cetyl trimethyl ammonium bromide (CTAB) concentration in the solvent.

Fast and Sensitive Detection of CO by Bi-MOF-Derived Porous InO/FeO Core-Shell Nanotubes.

InO is an optimal material for sensitive detection of carbon monoxide (CO) gas due to its low resistivity and high catalytic activity. Yet, the gas response dynamics between the CO gas molecules and the surface of InO is limited by its solid structure, resulting in a weak gas response value and sluggish electron transport. Herein, we report a strategy to synthesize porous InO/FeO core-shell nanotubes derived from In/Fe bimetallic organic frameworks.

A hard mask process and alignment device aims to achieve high consistency and mass-scale production of gas sensors based on spraying hydrothermal gas sensing material.

The material synthesized through the hydrothermal method has received extensive and in-depth study in recent years, with a large number of literature reporting their excellent performance in the fields of catalysis or gas sensitivity. In order to combine the hydrothermal material with micro-electro-mechanical system processes to achieve large-scale manufacturing of hydrothermal synthesized materials at the wafer-level, this paper proposes a series of processes for hard mask patterned electro-atomization spraying of hydrothermal materials and designs and manufactures an alignment device that achieves the alignment of silicon hard mask and electrode wafers based on the vacuum clamping principle. Through experiments, it has been verified that this device can achieve micrometer-level alignment between the hard mask and the electrode wafer.

Template Based Synthesis of Porous Graphdiyne Nanosheet for Reversible and Fast NO Detection by UV Irradiation.

Two-dimensional graphdiyne (GDY) formed by sp and sp hybridized carbon has been found to be an efficient toxic gas sensing material by density functional theory (DFT). However, little experimental research concerning its gas sensing capability has been reported owing to the complex preparation process and harsh experimental conditions. Herein, porous GDY nanosheets are successfully synthesized through a facile solvothermal synthesis technique by using CuO microspheres (MSs) as both template and source of catalyst.

Understanding the Catalytic Kinetics of Polysulfide Redox Reactions on Transition Metal Compounds in Li-S Batteries.

Because of their high energy density, low cost, and environmental friendliness, lithium-sulfur (Li-S) batteries are one of the potential candidates for the next-generation energy-storage devices. However, they have been troubled by sluggish reaction kinetics for the insoluble LiS product and capacity degradation because of the severe shuttle effect of polysulfides. These problems have been overcome by introducing transition metal compounds (TMCs) as catalysts into the interlayer of modified separator or sulfur host.

High-Performance Electrochemical Nitrate Reduction to Ammonia under Ambient Conditions Using a FeOOH Nanorod Catalyst.

Electrocatalytic nitrate reduction is promising as an environmentally friendly process to produce high value-added ammonia with simultaneous removal of nitrate, a widespread nitrogen pollutant, for water treatment; however, efficient electrocatalysts with high selectivity are required for ammonia formation. In this work, FeOOH nanorod with intrinsic oxygen vacancy supported on carbon paper (FeOOH/CP) is proposed as a high-performance electrocatalyst for converting nitrate to ammonia at room temperature. When operated in a 0.

A 3D FeOOH nanotube array: an efficient catalyst for ammonia electrosynthesis by nitrite reduction.

Nitrite (NO) is a detrimental pollutant widely existing in groundwater sources, threatening public health. Electrocatalytic NO reduction settles the demand for removal of NO and is also promising for generating ammonia (NH) at room temperature. A nanotube array directly grown on a current collector not only has a large surface area, but also exhibits improved structural stability and accelerated electron transport.

Ultrasensitive Pressure Sensor Sponge Using Liquid Metal Modulated Nitrogen-Doped Graphene Nanosheets.

Wearable pressure sensors are crucial for real-time monitoring of human activities and biomimetic robot status. Here, the ultrasensitive pressure sensor sponge is prepared by a facile method, realizing ultrasensitive pressure sensing for wearable health monitoring. Since the liquid metal in the sponge-skeleton structure under pressure is conducive to adjust the contact area with nitrogen-doped graphene nanosheets and thus facilitates the charge transfer at the interface, such sensors exhibit a fast response and recovery speed with the response/recovery time 0.

Tunable NHF-Assisted Synthesis of 3D Porous InO Microcubes for Outstanding NO Gas-Sensing Performance: Fast Equilibrium at High Temperature and Resistant to Humidity at Room Temperature.

NO gas sensors based on metal oxides under wild conditions are highly demanded yet an incomplete surface reaction and humidity interference on the gas-sensing performance limit their applications. Herein, we report three-dimensional (3D) porous InO microcubes via a simple hydrothermal strategy to produce outstanding NO gas-sensing performance: fast equilibrium of the surface reaction at 150 °C and negligible humidity dependence on the NO gas sensing at room temperature. The 3D porous InO microcubes with high surface areas, suitable pore sizes, rich oxygen vacancies, and high conductivity are testified.

Light and Heat Triggering Modulation of the Electronic Performance of a Graphdiyne-Based Thin Film Transistor.

Graphdiyne-based field effect thin film transistors (GTFTs) with a clean, efficient, nondestructive, continuous, and reversible modulation strategy have been developed for the first time. We have determined that efficient electronic modulation utilizing light and heat results in a significant improvement in GTFT performance. Heat can increase the switching ratio of the device to 10, while light regulation can induce a higher switching ratio of >10 by efficient charge injection with an improved conductivity of 1.

Nucleation density and pore size tunable growth of ZnO nanowalls by a facile solution approach: growth mechanism and NO gas sensing properties.

Nanowalls are novel nanostructures whose 3D porous network morphology holds great potential for applications as gas sensors. The realization of such a nanowall-based gas sensor depends directly on the comprehensive understanding of the growth mechanism of the nanowalls. We induced nucleation density and pore size evolution by increasing the dipping and growth times.

Direct Synthesis of Upstanding Graphene/ZnO Nanowalls/Graphene Sandwich Heterojunction and Its Application for NO² Gas Sensor.

An upstanding graphene/ZnO/graphene sandwich heterojunction synthesized by coating vertical ZnO nanowalls with two-dimensional (2D) graphene sheets is characterized and used for NO² detection at room temperature. The integration of graphene coatings and ZnO nanowalls yields improved NO² sensing properties with the few layer graphene providing high electrical conductivity and the ZnO nanowalls providing high sensitivity and selectivity to NO². At room temperature, the upstanding graphene/ZnO/graphene sandwich heterojunction sensor also exhibits a rapid response recovery time (25 s, 10 s) and good selectivity for NO² against CH⁴, CO, SO², NH³, and CH³CH²OH.

Overexpression of calpain‑1 predicts poor outcome in patients with colorectal cancer and promotes tumor cell progression associated with downregulation of FLNA.

Several studies have demonstrated that calpain‑1 is involved in a variety of pathophysiological processes, including tumorigenesis. However, the clinical relevance and role of calpain‑1 in colorectal cancer (CRC) are unclear. Filamin A (FLNA) is an actin‑binding protein that participates in cancer progression and can be cleaved by calpain‑1.

Molecule-based water-oxidation catalysts (WOCs): cluster-size-dependent dye-sensitized polyoxometalates for visible-light-driven O2 evolution.

From atomic level to understand the cluster-size-dependant behavior of dye-sensitized photocatalysts is very important and helpful to design new photocatalytic materials. Although the relationship between the photocatalytic behaviors and particles' size/shape has been widely investigated by theoretical scientists, the experimental evidences are much less. In this manuscript, we successfully synthesized three new ruthenium dye-sensitized polyoxometalates (POM-n, n relate to different size clusters) with different-sized POM clusters.