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Normally, only noncentrosymmetric structure of the materials can potentially be piezoelectric. Thus, it is limited in the field of piezoelectricity for the centrosymmetric structure of the material. In this work, the performance of piezoelectricity is successfully achieved from centrosymmetric SrFeO3‐x by modulating oxygen vacancies, which have a surface piezoelectric potential up to 93 mV by using...
Mechanically sensitive tissues (e.g., skeletal muscles) greatly need mechanical stimuli during the development and maturation. The extracellular matrix (ECM) mediates these signals through nonlinear viscoelasticity of collagen networks that are predominant components of the ECM. However, the interactions between cells and ECM form a feedback loop, and it has not yet been possible to determine the...
Platinum (Pt), as a commonly used electrocatalyst in direct methanol fuel cells (DMFCs), suffers from sluggish kinetics of both the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). Geometric engineering has been proven effective for improving the MOR and ORR activities. Thus, by modulating the Pt precursor and poly(vinylpyrrolidone) (PVP) dosages, different porous PtCu nanotubes...
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...
In article number 2101151, Hao Liu, Feng Xu, and co‐workers have developed an ionically conductive organohydrogel based soft electronic device that demonstrates excellent performances at freezing and elevated temperatures as well as in underwater conditions. The ionically conductive organohydrogel‐based electronics can be adhered on the robotic hand for grasping detection at extreme temperatures,...
Hydrogel‐based electronics have found widespread applications in soft sensing and health monitoring because of their remarkable biocompatibility and mechanical features similar to human skin. However, they are subjected to potential challenges like structural failure, functional degradation, and device delamination in practical applications, especially facing extreme environmental conditions (e.g...
Janus particles with asymmetric crystals show great importance in optoelectronics and photocatalysis, but their synthesis usually requires complicated procedures. Here, an unexpected Janus vitrification phenomenon is observed in a droplet caused by the Leidenfrost effect at a cryogenic temperature, which is commonly regarded as symmetric. The Leidenfrost phenomenon levitates the droplet when it comes...
In article number 2007325, Tian Jian Lu, Feng Xu, and co‐workers observed for the first time the Janus vitrification phenomenon in a droplet when it is levitated on liquid nitrogen by the Leidenfrost phenomenon. This finding reveals the asymmetric crystallization process in droplet vitrification, and opens a new door to create Janus particles through the Leidenfrost phenomenon.
Memristors are emerging as a rising star of new computing and information storage techniques. However, the practical applications are severely challenged by their instability toward harsh conditions, including high moisture, high temperatures, fire, ionizing irradiation, and mechanical bending. In this work, for the first time, lead‐free double perovskite Cs2AgBiBr6 is utilized for environmentally...
The unstable mechanical properties of flexible transparent conductive films (TCFs) make it difficult for them to meet the requirements for displays or wearable devices. Here, the relationship between the mechanism behind the bending behavior and the electrical properties, which is important for improving the mechanical stability of flexible TCFs, is explored. Flexible TCFs are reported based on silver...
Nitrogen dioxide (NO2) emission has severe impact on human health and the ecological environment and effective monitoring of NO2 requires the detection limit (limit of detection) of several parts‐per‐billion (ppb). All organic semiconductor‐based NO2 sensors fail to reach such a level. In this work, using an ion‐in‐conjugation inspired‐polymer (poly(3,3′‐diaminobenzidine‐squarine, noted as PDBS) as...
Neutrophils, the most abundant leukocytes (50–70% of the total leukocytes in circulation), are the major type of cells recruited to sites of inflammation during infection and tumorigenesis, suggesting that neutrophils could contribute to nanotherapeutics for inflammation and cancer therapy. Neutrophil‐based delivery has shown great potential in circumventing nanotherapeutics limitations, such as low...
Based on biocompatible and stretchable hydrogels, Fei Li, Feng Xu, and co‐workers propose a simple paradigm to prototype stretchable electronics with an embedded 3D helical conductive layout in article number 1801711. The 3D layout promises enhanced stretchability and robustness compared to traditional 1D and 2D designs. The hydrogel electronics can be directly incorporated onto the human body and...
The ever‐growing overlap between stretchable electronic devices and wearable healthcare applications is igniting the discovery of novel biocompatible and skin‐like materials for human‐friendly stretchable electronics fabrication. Amongst all potential candidates, hydrogels with excellent biocompatibility and mechanical features close to human tissues are constituting a promising troop for realizing...
Recently, organic–inorganic hybrid perovskites (OIHP) are studied in memory devices, but ternary resistive memory with three states based on OIHP is not achieved yet. In this work, ternary resistive memory based on hybrid perovskite is achieved with a high device yield (75%), much higher than most organic ternary resistive memories. The pseudohalide‐induced 2D (CH3NH3)2PbI2(SCN)2 perovskite thin film...
A high density of edge sites and other defects can significantly improve the catalytic activity of layered 2D materials. Herein, this study demonstrates a novel top‐down strategy to maximize catalytic edge sites of MoSe2 by breaking up bulk MoSe2 into quantum dots (QDs) via “turbulent shear mixing” (TSM). The ultrasmall size of the MoSe2 QDs provides a high fraction of atoms in reactive edge sites,...
An organic thin‐film gas sensor based on squaraine detects ammonia as low as 40 ppb with impressive reversibility and stability. The resonance‐stabilized zwitterionic characteristics offer squaraines high affinity and sensitivity toward electron‐rich analytes without irreversible chemical binding, while the embedded squaric ring makes SA‐CH3 highly sensitive. The symmetric molecular geometry and good...
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