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Tip‐Based Lithography
In article number 2309484, Jae‐Won Jang and co‐workers report the tip‐based lithography with a sacrificial layer. The sacrificial layer minimizes the scratching of the gold film by nano‐indentation during tip‐based lithography, which enables the fabrication of sub‐50 nm‐sized gold nanoholes. A single 20 nm diameter gold particle was trapped in a 35 nm diameter gold nanohole via...
The fabrication of a highly controlled gold (Au) nanohole (NH) array via tip‐based lithography is improved by incorporating a sacrificial layer—a tip‐crash buffer layer. This inclusion mitigates scratches during the nano‐indentation process by employing a 300 nm thick poly(methyl methacrylate) layer as a sacrificial layer on top of the Au film. Such a precaution ensures minimal scratches on the Au...
Hierarchical superstructures have novel shape‐dependent properties, but well‐defined anisotropic carbon superstructures with controllable size, shape, and building block dimensionality have rarely been accomplished thus far. Here, a hierarchical assembly technique is presented that uses spinodal decomposition (SD) to synthesize anisotropic oblate particles of mesoporous carbon superstructure (o‐MCS)...
All‐solid‐state lithium batteries (ASSLBs) are considered promising alternatives to current lithium‐ion batteries that employ liquid electrolytes due to their high energy density and enhanced safety. Among various types of solid electrolytes, sulfide‐based electrolytes are being actively studied, because they exhibit high ionic conductivity and high ductility, which enable good interfacial contacts...
Ultralow Power Gas Sensors
Toxic gases covertly pose significant threats to our everyday lives due to their inert characteristics. In article number 2304555, Jun‐Bo Yoon and co‐workers introduce a groundbreaking ultrathin serpentine insulation design for a highly reliable, energy‐efficient gas sensor. Its mechanically resilient structure achieves over 10,000 cycles of operation and withstood temperatures...
Toxic gases have surreptitiously influenced the health and environment of contemporary society with their odorless/colorless characteristics. As a result, a pressing need for reliable and portable gas‐sensing devices has continuously increased. However, with their negligence to efficiently microstructure their bulky supportive layer on which the sensing and heating materials are located, previous...
Lithium (Li) metal anodes (LMAs) are promising anode candidates for realizing high‐energy‐density batteries. However, the formation of unstable solid electrolyte interphase (SEI) layers on Li metal is harmful for stable Li cycling; hence, enhancing the physical/chemical properties of SEI layers is important for stabilizing LMAs. Herein, thiourea (TU, CH4N2S) is introduced as a new catalyzing agent...
Passivation is a popular method to increase power conversion efficiency (PCE), reduce hysteresis related to surface traps and defects, and adjust mismatched energy levels. In this paper, an approach is reported using ammonium chloride (AC) to enhance passivation effects by controlling chlorine (Cl) and ammonium ions (NH4+) on the front and back side of tin oxides (SnO2). AC pre‐treatment is applied...
Herein, a sequential gas‐phase process involving air jet milling followed by chemical vapor deposition (CVD), is demonstrated to be an efficient strategy for the fabrication of heterolayered 2D nanohybrids (2DNHs) decorated with nanocatalysts. Tens of grams of the nanohybrids, which is a substantial quantity at the laboratory scale, are produced in the absence of solvents and water, and without the...
The rapid transport of alkali ions in electrodes is a long‐time dream for fast‐charging batteries. Though electrode nanostructuring has increased the rate‐capability, its practical use is limited because of the low tap density and severe irreversible reactions. Therefore, development of a strategy to design fast‐charging micron‐sized electrodes without nanostructuring is of significant importance...
Lithium–Sulfur Batteries
In article number 2200326, Kang‐Jun Baeg, Jun‐Woo Park, an co‐workers develop high‐energy‐density flexible lithium–sulfur (Li–S) batteries with high‐loading, free‐standing cathodes and chemically functionalized carbon mixture interlayers. The multimodal capturing effect via simultaneous physical trapping and strong chemical interactions is highly efficient for immobilizing...
The widespread adoption of Li‐ion batteries is currently limited by their unstable electrochemical performance and high flammability under mechanical deformation conditions and a relatively low energy density. Herein, high‐energy‐density lithium–sulfur (Li–S) batteries are developed for applications in next‐generation flexible electronics and electric vehicles with long cruising distances. Freestanding...
Although the dendritic cell (DC)‐based modulation of immune responses has emerged as a promising therapeutic strategy for tumors, infections, and autoimmune diseases, basic research and therapeutic applications of DCs are hampered by expensive growth factors and sophisticated culture procedures. Furthermore, the platform to drive the differentiation of a certain DC subset without any additional biochemical...
The interface architectures of inorganic–organic halide perovskite‐based devices play key roles in achieving high performances with these devices. Indeed, the perovskite layer is essential for synergistic interactions with the other practical modules of these devices, such as the hole‐/electron‐transfer layers. In this work, a heterostructure geometry comprising transition‐metal dichalcogenides (TMDs)...
Cell‐laden structures are widely applied for a variety of tissue engineering applications, including tissue restoration. Cell‐to‐cell interactions in bioprinted structures are important for successful tissue restoration, because cell–cell signaling pathways can regulate tissue development and stem cell fate. However, the low degree of cell–cell interaction in conventional cell‐laden bioprinted structures...
Tissue Engineering
In article number 2106487, Dongryeol Ryu, GeunHyung Kim, and co‐workers propose a microfluidic device with cell‐laden methacrylated gelatin bioink and alginate as a matrix hydrogel to fabricate a functional hybrid structure, which is obtained using a one‐step process, laden with cell‐aggregated microbeads for tissue engineering applications. The cell‐bead‐laden hybrid struts exhibit...
Flexible Tactile Sensors
In article number 2105334, Jongbaeg Kim and co‐workers present a flexible tactile sensor based on the carbon nanotube‐wrinkled structure. The strategies to improve the sensing performance are provided. In this cover image, the components of the tactile sensor, which is a hierarchical structure with aggregated carbon nanotube bundles, are expressed.
Flexible tactile sensors with high sensitivity have received considerable attention for their use in wearable electronics, human–machine interfaces, and health‐monitoring devices. Although various micro/nanostructured materials are introduced for high‐performance tactile sensors, simultaneously obtaining high sensitivity and a wide sensing range remains challenging. Here, a resistive tactile sensor...
Since Ni‐rich cathode material is very sensitive to moisture and easily forms residual lithium compounds that degrade cell performance, it is very important to pay attention to the selection of the surface modifying media. Accordingly, hydroxyapatite (Ca5(PO4)3(OH)), a tooth‐derived material showing excellent mechanical and thermodynamic stabilities, is selected. To verify the availability of hydroxyapatite...
The highly selective detection of trace gases using transparent sensors at room temperature remains challenging. Herein, transparent nanopatterned chemiresistors composed of aligned 1D Au–SnO2 nanofibers, which can detect toxic NO2 gas at room temperature under visible light illumination is reported. Ten straight Au–SnO2 nanofibers are patterned on a glass substrate with transparent electrodes assisted...
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