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Understanding the growth behavior and morphology evolution of defects in 2D transition metal dichalcogenides is significant for the performance tuning of nanoelectronic devices. Here, the low‐voltage aberration‐corrected transmission electron microscopy with an in situ heating holder and a fast frame rate camera to investigate the sulfur vacancy lines in monolayer MoS2 is applied. Vacancy concentration‐dependent...
The precise facet modulation of transition metal nitrides (TMNs) has been regarded as an essential issue in boosting electrocatalytic H2 production. Compared to thermal nitridation, the plasma technique serves as a favorable alternative to directly achieve TMNs, but the apparent surface heating effect during plasma treatment inevitably causes the thermally stabilized nitride formation, resulting in...
Biological ion channels exhibit excellent ion selectivity, but it has been challenging to design their artificial counterparts, especially for highly efficient separation of similar ions. Here, a new strategy to achieve high selectivity between alkali metal ions with artificial nanostructures is reported. Molecular dynamics (MD) simulations and experiments are combined to study the transportation...
Gold–copper (Au‐Cu) Janus nanostructures (Au‐Cu Janus NSs) are successfully prepared using N‐oleyl‐1,3‐propanediamine as capping agent and Cu(acac)2 as the precursor in a typical seeded growth strategy. By preferably depositing Cu atoms on one side of concave cubic Au seeds, the Cu part gradually grows larger as more Cu precursors are added, making the size tuning feasible in the range of 74–156 nm...
Integration of photovoltaic (PV) and electroluminescent (EL) functions and/or units in one device is attractive for new generation optoelectronic devices but it is challenging to achieve highly comprehensive efficiency. Herein, perovskite solar cells (PSCs) are fabricated, assisted by 3‐sulfopropyl methacrylate potassium salt (SPM) additive to tackle this issue. SPMs not only induce large grain size...
To better exploit all‐liquid 3D architectures, it is essential to understand dynamic processes that occur during printing one liquid in a second immiscible liquid. Here, the interfacial assembly and transition of 5,10,15,20‐tetrakis(4‐sulfonatophenyl) porphyrin (H6TPPS) over time provides an opportunity to monitor the interfacial behavior of nanoparticle surfactants (NPSs) during all‐liquid printing...
All‐Liquid 3D Architectures
In article number 2105017, Qun Chen, Jian‐Mei Lu, Thomas P. Russell, and co‐workers present interconversion of porphyrins for monitoring the time‐dependent interfacial behavior of nanoparticle surfactants. In all‐liquid 3D printed structures, the conversion in the aggregate state with time is reflected in a spatially varying change in the color, providing a means of assessing...
Here, a strategy is reported to prepare Ni‐Fe layered double hydroxide (NiFe‐LDH) with abundant exposed edge planes for enhanced oxygen evolution reaction (OER). The edge‐to‐edge assembly of ultrafine NiFe‐LDH directed by graphite‐like carbon is performed through a one‐step hydrothermal process to form self‐supporting nanosheet arrays (named NiFe‐LDH/C), in which ascorbic acid is employed as the carbon...
Designing highly efficient and durable electrocatalysts that accelerate sluggish oxygen reduction reaction kinetics for fuel cells and metal–air batteries are highly desirable but challenging. Herein, a facile yet robust strategy is reported to rationally design single iron active centers synergized with local S atoms in metal–organic frameworks derived from hierarchically porous carbon nanorods (Fe/N,S‐HC)...
Here, a pair of A1–D–A2–D–A1 unfused ring core‐based nonfullerene small molecule acceptors (NF‐SMAs), BO2FIDT‐4Cl and BT2FIDT‐4Cl is synthesized, which possess the same terminals (A1) and indacenodithiophene unit (D), coupling with different fluorinated electron‐deficient central unit (difluorobenzoxadiazole or difluorobenzothiadiazole) (A2). BT2FIDT‐4Cl exhibits a slightly smaller optical bandgap...
The fate of stem cells at the single cell level with limited communication with other cells is still unknown due to the lack of an efficient tool for highly accurate molecular detection. Moreover, the conditional sensitivity of biological experiments requires a sufficient number of parallel experiments to support a conclusion. In this work, a microfluidic single cell chip is designed for use with...
In article number 1905001, Lin Han, Hong Liu, Yuanhua Sang, and co‐workers design a microfluidic single cell chip with a protein chip to study the effect of hydroxyapatite (HAp) on the osteogenic differentiation of human adiposederived stem cells (hADSCs) in situ at the single cell level. The detection of secretory proteins confirms that HAp nanorods enhance osteogenic differentiation at the single...
Ever‐growing tissue regeneration and other stem cell therapies cause pressing need for large population of self‐renewable stem cells. However, stem cells gradually lose their stemness after long‐term in vitro cultivation. In this study, a ZnO nanorod (ZnO NR) array is used to maintain the stemness of human adipose‐derived stem cells (hADSCs). The results prove that after culturing hADSCs on ZnO NRs...
Tin diselenide (SnSe2) nanosheets as novel 2D layered materials have excellent optical properties with many promising application prospects, such as photoelectric detectors, nonlinear optics, infrared photoelectric devices, and ultrafast photonics. Among them, ultrafast photonics has attracted much attention due to its enormous advantages; for instance, extremely fast pulse, strong peak power, and...
Tin diselenide (SnSe2) nanosheets as novel 2D layered materials have excellent optical properties. In article number 1902811, Xiao‐Hui Li and co‐workers characterize SnSe2 nanosheets systemically and successfully apply SnSe2 nanosheets in an Er‐doped fiber laser to obtain 31th order subpicosecond harmonic mode‐locking, corresponding to a 257.3‐MHz repetition rate.
Cell lysis is an important and crucial step for the detection of intracellular secrets. Usually, cell lysis is based on strong ultrasonic waves or toxic chemical regents, which require a large amount of cell suspension. To obtain high efficiency cell lysis for a small amount of sample, a mechanical cell lysis method based on a surface acoustic wave (SAW) microchip is proposed. The microchip simply...
In article number 1804593, Zhaoxin Geng, Hong Liu, and co‐workers introduce a cell lysis method in a surface acoustic wave (SAW) microchip. When a biofluid droplet containing cells and microparticles is dropped on the working microchip, the cell membrane function is disrupted by the SAW. The intracellular contents are released after cell lysis, which can be used in disease diagnosis and stem cell...
High‐pressure resistant and multidirectional compressible materials enable various applications but are often hindered by structure‐derived collapse and weak elasticity. Here, a super‐robust graphene foam with ladder shape microstructure capable of withstanding high pressure is presented. The multioriented ladder arrays architecture of the foam, consisting of thousands of identically sized square...
In conventional foams, electrical properties often play a secondary role. However, this scenario becomes different for 3D graphene foams (GrFs). In fact, one of the motivations for synthesizing 3D GrFs is to inherit the remarkable electrical properties of individual graphene sheets. Despite immense experimental efforts to study and improve the electrical properties of 3D GrFs, lack of theoretical...
Conventional methods to induce strain in 2D materials can hardly catch up with the sharp increase in requirements to design specific strain forms, such as the pseudomagnetic field proposed in graphene, funnel effect of excitons in MoS2, and also the inverse funnel effect reported in black phosphorus. Therefore, a long‐standing challenge in 2D materials strain engineering is to find a feasible scheme...
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