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Heterostructures play an irreplaceable role in high‐performance optoelectronic devices. However, the preparation of robust perovskite heterostructures is challenging due to spontaneous interdiffusion of halogen anions. Herein, a vapor‐phase anion exchange method universally suitable for the preparation of robust 2D Ruddlesden–Popper perovskite (RPP) heterostructures is developed. A variety of heterostructures...
The precise and comprehensive manipulation of the component, size, and geometric nano‐architecture of platinum‐based electrocatalysts into porous and hollow structure can effectively impart the catalysts with substantially improved electrochemical performance, yet remain formidably challenging. Herein, a straightforward fabrication of porous platinum‐copper alloyed nanobowls (abbreviated as Pt3Cu...
Neural stem cells (NSCs) are used to treat various nervous system diseases because of their self‐renewal ability and multidirectional differentiation potential. However, an insufficient ability to track their migration in vivo and poor control over their survival and differentiation efficiency are two major critical challenges for clinical application. Here, it is shown that when magnetic nanobubbles...
Photodetecting Paper
In article number 2200563, Xiaohong Chen, Duanjun Cai, and co‐workers develop a solar‐blind photodetecting paper based on ZnO nanoarray and 2D h‐BN interlayer with ultrahigh responsivity up to 700 A W−1 @ 265–276 nm and switchable detection bands between UVA (>315 nm) and UVC (<280 nm), through up‐conversion absorption and negative differential resistance effect.
Solar‐blind photodetectors (PDs) are widely applicable in special, military, medical, environmental, and commercial fields. However, high performance and flexible PD for deep ultraviolet (UV) range is still a challenge. Here, it is demonstrated that an upconversion of photon absorption beyond the energy bandgap is achieved in the ZnO nanoarray/h‐BN heterostructure, which enables the ultrahigh responsivity...
In‐plane anisotropy in 2D rhenium disulfide (ReS2) offers intriguing opportunities for designing future electronic and optical devices, and toward such applications, it is crucial to identify the crystal orientation in such 2D anisotropic materials. Existing spectroscopy or electron microscopy methods for determining the crystalline orientation often require complicated sample preparing procedures...
Resistive pressure sensors have been widely studied for application in flexible wearable devices due to their outstanding pressure‐sensitive characteristics. In addition to the outstanding electrical performance, environmental friendliness, breathability, and wearable comfortability also deserve more attention. Here, a biodegradable, breathable multilayer pressure sensor based piezoresistive effect...
Thermally activated delayed fluorescence (TADF) materials with extremely small singlet‐triplet energy offsets have opened new horizons for the development of metal‐free photosensitizers for photodynamic therapy (PDT) in recent years. However, the exploration of near‐infrared (NIR) TADF emitters for efficient two‐photon‐excited (TPE) PDT is still a formidable challenge, thus it has not been reported...
Photodynamic Therapy
In article number 2106215, Menglin Li, Jinfeng Zhang, and co‐workers develop a metal‐free photosensitizer (PS) based on thermally activated delayed fluorescence (TADF) nanoparticles, which demonstrates intrinsic two‐photon‐excited (TPE) property, near‐infrared emissive fluorescence, and singlet oxygen generation ability. Moreover, the TPE‐photodynamic therapy (PDT) performance...
Electrochemical CO2 reduction reaction (CO2RR) is a promising approach to convert CO2 to carbon‐neutral fuels using external electric powers. Here, the Bi2S3‐Bi2O3 nanosheets possessing substantial interface being exposed between the connection of Bi2S3 and Bi2O3 are prepared and subsequently demonstrate to improve CO2RR performance. The electrocatalyst shows formate Faradaic efficiency (FE) of over...
Herein, alkoxylation chemistry is introduced as a “one‐stone‐three‐birds” solution for exploring a new family of highly‐fluorescent octupolar 2D‐conjugated organic polymers/frameworks (OCOPs/OCOFs) combining far‐red emission, high fluorescence quantum yield (QY), and strong two‐photon absorption (TPA). Both alkoxy‐substituted OCOP and OCOF comprising acrylonitrile‐bridged strongly‐coupled donor3‐(acceptor...
To develop durable and low‐price catalysts of methanol oxidation to commercialize direct methanol fuel cell, many attempts have been made at fabricating Pt‐based hybrids by designing component‐, morphology‐, facet‐, integration‐pattern‐varied nanostructures, and have achieved considerable successes. However, most of present catalysts still lack robust catalytic durability especially owing to the corrosion...
Monolayer transition metal dichalcogenides (TMDCs) with high crystalline quality are important channel materials for next‐generation electronics. Researches on TMDCs have been accelerated by the development of chemical vapor deposition (CVD). However, antiparallel domains and twin grain boundaries (GBs) usually form in CVD synthesis due to the special threefold symmetry of TMDCs lattices. The existence...
Metal–organic frameworks (MOFs) built on calcium metal (Ca‐MOFs) represent a unique subclass of MOFs featuring high stability, low toxicity, and relatively low density. Ca‐MOFs show considerable potential for molecular separations, electronic, magnetic, and biomedical applications, although they are not investigated as extensively as transition metal‐based MOFs. Compared to MOFs made of other groups...
The self‐transportation of mobile Leidenfrost droplets with well‐defined direction and velocity on millimetric ratchets is one of the most representative and spectacular phenomena in droplet dynamics. Despite extensive progress in the ability to control the spatiotemporal propagation of droplets, it remains elusive how the individual ratchet units, as well as the interactions within their arrays,...
In article number 1901304, Zewei Quan and co‐workers report the fabrication of free‐standing 2D honeycomb‐like gold superstructures by a simple method, which combines liquid interface‐mediated nanoparticle assembly with metallic attachment. Such ordered mesoporous superstructures are structurally stable and exhibit uniformly enhanced electromagnetic fields at the hexagonally arranged mesopore sites...
2D mesoporous materials fabricated via the assembly of nanoparticles (NPs) not only possess the unique properties of nanoscale building blocks but also manifest additional collective properties due to the interactions between NPs. In this work, reported is a facile and designable way to prepare free‐standing 2D mesoporous gold (Au) superstructures with a honeycomb‐like configuration. During the fabrication...
Flexible strain sensors can detect physical signals (e.g., temperature, humidity, and flow) by sensing electrical deviation under dynamic deformation, and they have been used in diverse fields such as human motion detection, medical care, speech recognition, and robotics. Existing sensing materials have relatively low adaptability and durability and are not stretchable and flexible enough for complex...
Hollow structured materials are widely applicable in various fields. Although many routes have been explored for getting such materials, a strategy mainly based on physical effect is still deficient. Herein, a “stresses induced orientation contraction” mechanism for preparation of hollow structures is reported. The composites constructed by zeolite imidazolate framework‐8 (ZIF8) cores and polymerized...
Rechargeable lithium–sulfur batteries, which use sulfur as the cathode material, promise great potentials to be the next‐generation high‐energy system. However, higher‐order lithium polysulfides, Li2Sx (x = 4, 6, and 8), regardless of in charge or in discharge, always form first, dissolve subsequently in the electrolyte, and shuttle to the cathode and the anode, which is called “shuttle effect.” The...
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