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Nucleation and Growth of Bubbles
In article number 2103301, Yongming Hu, Chee Leung Mak, Linfeng Fei, and co‐workers present the nucleation and growth mechanisms of bubbles extracted in TEM by monitoring the decomposition of a solid precursor. Under electron‐beam irradiation, the 2D Ni(OH)2 flake emits gaseous species within the solid matrix, leading to nanoscale bubbling processes via a three‐step...
Blue‐Emitting Perovskite Films
In article number 2103169, Zhizhen Ye, Haiping He and co‐workers report a facile vapor anion exchange method that can easily introduce Cl atoms into Br‐based films and enables preparation of blue‐emitting perovskite films with excellent surface morphology and good spectral photo‐stability. Furthermore, optically pumped blue amplified spontaneous emission is realized...
Sb2S3 is an attractive solar absorber material that has garnered tremendous interest because of its fascinating properties for solar cells including suitable band gap, high absorption coefficient, earth abundance, and excellent stability. Over the past several years, intensive efforts have been made to enhance the photovoltaic efficiencies of Sb2S3 solar cells using many promising approaches including...
Owing to the urgent need for electrochemical analysis and sensing of trace target molecules in various fields such as medical diagnosis, agriculture and food safety, and environmental monitoring, signal amplification is key to promoting analysis and sensing performance. The nanoconfinement effect, derived from nanoconfined spaces and interfaces with sizes approaching those of target molecules, has...
The electrochemical nitrogen fixation under mild conditions is a promising alternative to the current nitrogen industry with high energy consumption and greenhouse gas emission. Here, a nanoporous boron carbide (np‐B13C2) catalyst is reported for electrochemical nitrogen fixation, which is fabricated by the combination of metallurgical alloy design and chemical etching. The resulting np‐B13C2 exhibits...
Solid composite electrolyte‐based Li battery is viewed as one of the most competitive system for the next generation batteries; however, it is still restricted by sluggish ion diffusion. Fast ion transport is a characteristic of the polyethylene oxide (PEO) amorphous phase, and the mobility of Li+ is restrained by the coordination interaction within PEO and Li+. Herein, the design of applying functionalized...
Light is essential to all life on the earth. Thus, highly efficient light‐harvesting systems with the sequential energy transfer process are significant for using solar energy in photosynthesis. For developing an efficient light‐harvesting system, a liquid aggregation‐induced emission (AIE) dye TPE‐EA is obtained, as a donor and solvent, which can light up the aggregation caused quenching (ACQ) Nile...
The advantage of using flexible metallic structures as the substrate of flexible lasers over plastic materials is its strong mechanical strength and high thermal conductivity. Here, it is proposed to deposit CsPbBr3 perovskite quantum dots onto Ni porous foam for the realization of flexible lasers. Under two‐photon 800 nm excitation at room temperature, incoherent random lasing emission is observed...
Measuring the changes in tumor cell surface temperature can provide insights into cellular metabolism and pathological features, which is significant for targeted chemotherapy and hyperthermic therapy. However, conventional micro–nano scale methods are invasive and can only measure the temperature of cells across a single plane, which excludes specific organelles. In this study, fluorescence quantum...
g‐C3N4/CdS heterojunctions are potential photocatalysts for hydrogen production but their traditional type‐II configuration generally leads to weak oxidative and reductive activity. How to construct the novel Z‐scheme g‐C3N4/CdS counterparts to address this issue remains a great challenge in this field. In this work, a new direct Z‐scheme heterojunction of defective g‐C3N4/CdS is designed by introducing...
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...
To construct a highly efficient photoelectrochemical tandem device with silicon photocathode operating in alkaline conditions, it is desirable to develop stable and active catalysts which enable the photocathode to reliably perform under an alkaline environment. With nanostructured passivation layer and edge‐exposed transition metal disulfides, silicon photocathode provides new opportunities for achieving...
Xenon Trapping
Xenon (Xe) atoms are trapped in silicate nanocages in contact with a metal surface. The atoms can be trapped at moderate temperatures (> 300 K) and released by heating to elevated temperatures (> 750 K). This can benefit several applications, including Xe production, nuclear power, nuclear waste remediation, and nonpro liferation of nuclear weapons. More details can be found in...
Despite the known efficacy of CeO2 as a promoter in alkaline hydrogen evolution reaction (HER), the underlying mechanism of this effect remains unclear. CoS2, a pyrite‐type alkaline HER electrocatalyst, suffers from sluggish HER kinetics and severe catalyst leaching due to its weak water dissociation kinetics and oxygen‐related corrosion. Herein, it is demonstrated that the interfacial Lewis acid–base...
Improving greatly the separation efficiency of interfacial charge carrier is a major challenge in photocatalysis. Herein, a new class of C60‐mediated NH2‐MIL‐125(Ti)/Zn0.5Cd0.5S S‐scheme heterojunction with enhanced interfacial charge carrier separation is designed and synthesized. The constructed S‐scheme heterojunction thermodynamically favors photocatalytic H2 evolution because of the large driving...
There is a huge demand for clean energy conversion in all industries. The clean energy production processes include electrocatalytic and photocatalytic conversion of water to hydrogen, carbon dioxide reduction, nitrogen conversion to ammonia, and oxygen reduction reaction and require novel cheap and efficient photo‐ and electrocatalysts and their scalable methods of fabrication. Atomic layer deposition...
Hyperbolic phonon polaritons (HPhPs) in hexagonal boron nitride (hBN) enable the direct manipulation of mid‐infrared light at nanometer scales, many orders of magnitude below the free‐space light wavelength. High‐resolution monochromated electron energy‐loss spectroscopy (EELS) facilitates measurement of excitations with energies extending into the mid‐infrared while maintaining nanoscale spatial...
Xenon (Xe) is a valuable and scarce noble gas used in various applications, including lighting, electronics, and anesthetics, among many others. It is also a volatile byproduct of the nuclear fission of uranium. A novel material architecture consisting of silicate nanocages in contact with a metal surface and an approach for trapping single Xe atoms in these cages is presented. The trapping is done...
Hyperbolic Phonon Polaritons
The high energy beam of the electron microscope allows for precision excitation of hyperbolic phonon polaritons in hexagonal boron nitride. Using high spatial/spectral resolution monochromated electron energy‐loss spectroscopy, Andrea Konecná, Jordan A. Hachtel, and co‐workers rigorously survey the behavior of these mid‐infrared optical excitations in nanostructured systems...
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