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Anticoagulation Blood Vessels
In article number 2300564, Yeonho Choi, Jae Seung Jung, and co‐workers fabricate an anticoagulation blood‐vessel by omniphobic structure. They fabricate it by rolling up the omniphobic structured polymer film. The blood droplet slide fast in the tube without any residual, and they verify the anticoagulation effect according to the animal test. They expect that it could...
Ultra‐Low Power Gas Sensors
In article number 2207165, Yong‐Hoon Cho, Inkyu Park, and co‐workers develop a photoactivated gas sensor with fully integrated micro‐light‐emitting diodes (LEDs) for highly sensitive gas detection at nanowatt‐level. The distance between the gas sensing material (In2O3) and the light activation source (micro‐LED) is only 1 μm, minimizing wasted light energy. Additionally,...
Supraparticle Powders
Controlling the structure and porosity in hierarchical materials is a key design feature that can enable their successful application in fields of chromatography, catalysis and adsorption. In article number 2300241, Benjamin Apeleo Zubiri, Alexandra Inayat, Nicolas Vogel, and co‐workers provide a versatile toolbox for designing hierarchical porous materials by tailoring the porosity...
Solid Microneedles
Despite the significance of microneedles for drug delivery, high‐cost, limited‐geometries, and complex fabrication are still hampering their expansion. Xenon difluoride (XeF2) dry etching precisely manufactures thousands of microneedles with tunable dimensions and geometries on a single patch. Confirming their penetration with skin models and numerical analyses, these microneedles...
Quasi‐Particles
Hydrodynamic fluids, such as water, can have a whirlpool structure because of backflows near the injection or sinking point. However, electrons in conventional solids have an Ohmic flow, making whirlpool formation impossible. In article number 2206604, Gyung‐Min Choi, Maxim Nikolaevich Chernodub, and co‐workers find that electron‐hole quasiparticles in WTe2 semimetal have the pseudo‐hydrodynamic...
High‐Entropy Oxides
In article number 2207820, Gyoung Hwa Jeong, Myong Yong Choi, and co‐workers successfully synthesize VMnCoNiFe high‐entropy oxides on MXene using a microwave method. These oxides exhibit higher activity than commercial IrO2 catalysts in electro‐O2 evolution under visible light. Also, water electrolysis delivers a low cell voltage of 1.62 V.
Field‐Effect Transistors
In article number 2207858, Huajie Chen, Zebing Zeng, Yuanyuan Hu, and co‐workers report a methodology of fabricating electrodes for semiconductor devices by van der Waals integration of doped organic semiconductor films (DOSCFs). The DOSCF electrodes are attractive due to their solution‐processability, mechanically flexibility, and interesting optoelectronic properties. The...
Introducing heteroatom into catalyst lattice to modulate its intrinsic electronic structure is an efficient strategy to improve the electrocatalytic performance in Li–O2 batteries. Herein, Cu‐doped CoS2 (Cu–CoS2) nanoparticles are fabricated by a solvothermal method and evaluated as promising cathode catalysts for Li–O2 batteries. Based on physicochemical analysis as well as density functional theory...
Having a permanent omniphobicity on the inner surface of the tube can bring enormous advantages, such as reducing resistance and avoiding precipitation during mass transfer. For example, such a tube can prevent blood clotting when delivering blood composed of complex hydrophilic and lipophilic compounds. However, it is very challenging to fabricate micro and nanostructures inside a tube. To overcome...
Cesium copper halide perovskite is one of the promising materials for solar‐blind light detection. However, most of the cesium copper halide perovskite‐based photodetectors (PDs) are focused on ultraviolet A detection and realized on the rigid substrate in the single device configuration. Here, a flexible solar‐blind PDs array (10 × 10 pixels) based on the CsCu2I3 film patterns for ultraweak light...
The electrosynthesis of recyclable ammonia (NH3) from nitrate under ambient conditions is of great importance but still full of challenges for practical application. Herein, an efficient catalyst design strategy is developed that can engineer the surface microenvironment of a PdCu hollow (PdCu‐H) catalyst to confine the intermediates and thus promote selective NH3 electrosynthesis from nitrate. The...
The advancement in thermosensitive active hydrogels has opened promising opportunities to dynamic full‐thickness skin wound healing. However, conventional hydrogels lack breathability to avoid wound infection and cannot adapt to wounds with different shapes due to the isotropic contraction. Herein, a moisture‐adaptive fiber that rapidly absorbs wound tissue fluid and produces a large lengthwise contractile...
Triboelectric nanogenerators are an emerging energy‐scavenging technology that can harvest kinetic energy from various mechanical moments into electricity. The energy generated while humans walk is the most commonly available biomechanical energy. Herein, a multistage consecutively‐connected hybrid nanogenerator (HNG) is fabricated and combined with a flooring system (MCHCFS) to efficiently harvest...
Hard carbons are deemed as promising anode materials for high‐performance potassium‐ion battery, but their commercialization is still hindered by the insufficient K+ transfer kinetics and poor potassiophilicity. Herein, these issues are addressed by improving the wettability of hard carbon, which can be achieved by the introduction of open mesochannels. A series of such hollow mesoporous carbon capsules...
Nitrate is a reasonable alternative instead of nitrogen for ammonia production due to the low bond energy, large water‐solubility, and high chemical polarity for good absorption. Nitrate electroreduction reaction (NO3RR) is an effective and green strategy for both nitrate treatment and ammonia production. As an electrochemical reaction, the NO3RR requires an efficient electrocatalyst for achieving...
Li–CO2 battery provides a new strategy to simultaneously solve the problems of energy storage and greenhouse effect. However, the severe polarization of CO2 reduction and CO2 evolution reaction impede the practical application. Herein, anodic TiO2 nanotube arrays are first introduced as carbon‐free and free‐standing cathode for photo‐assisted Li–CO2 battery, and the photo‐assisted charge and discharge...
Both organic solar cells (OSCs) and organic thermoelectrics (OTEs) are promising energy‐harvesting technologies for future renewable and sustainable energy sources. Among various material systems, organic conjugated polymers are an emerging material class for the active layers of both OSCs and OTEs. However, organic conjugated polymers showing both OSC and OTE properties are rarely reported because...
A drying droplet containing colloidal particles can consolidate into a spherical assembly called a supraparticle. Such supraparticles are inherently porous due to the spaces between the constituent primary particles. Here, the emergent, hierarchical porosity in spray‐dried supraparticles is tailored via three distinct strategies acting at different length scales. First, mesopores (<10 nm) are introduced...
Two‐dimensional (2D) layered materials have been widely used as catalysts due to their high specific surface area, large fraction of uncoordinated surface atoms, and high charge carrier mobility. Moiré superlattice emerges in 2D layered materials with twist angle or lattice mismatch. By manipulating the moiré superlattice structure, 2D layered materials present modulated electronic band structure,...
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