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Trained immunity is a recently described phenomenon whereby cells of the innate immune system undergo long‐term epigenetic and/or metabolic reprogramming following a short‐term interaction with microbes or microbial products. Here, it is shown that 2D transition metal dichalcogenides (TMDs) trigger trained immunity in primary human monocyte‐derived macrophages. First, aqueous dispersions of 2D crystal...
Advances in large‐area and high‐quality 2D transition metal dichalcogenides (TMDCs) growth are essential for semiconductor applications. Here, the gas‐phase alkali metal‐assisted metal‐organic chemical vapor deposition (GAA‐MOCVD) of 2D TMDCs is reported. It is determined that sodium propionate (SP) is an ideal gas‐phase alkali‐metal additive for nucleation control in the MOCVD of 2D TMDCs. The grain...
Energy Harvesting
In article number 2200184, Yong Soo Cho and co‐workers successfully apply an interdigitated electrode for a centimeter‐scale monolayer MoS2 film having preferred domain structure, without a complicated etching or e‐beam lithography process. The fabricated device exhibits superior piezoelectric energy harvesting performance with 400.4 mV and 40.7 nA.
2D transition‐metal dichalcogenides have been reported to possess piezoelectricity due to their lack of inversion symmetry; thus, they are potentially applicable as electromechanical energy harvesters. Herein, the authors propose a lithography‐free piezoelectric energy harvester composed of centimeter‐scale MoS2 monolayer films with an interdigitated electrode pattern that is enabled only by the large...
This article reviews recent fabrication methods for surface‐enhanced Raman spectroscopy (SERS) substrates with a focus on advanced nanoarchitecture based on noble metals with special nanospaces (round tips, gaps, and porous spaces), nanolayered 2D materials, including hybridization with metallic nanostructures (NSs), and the contemporary repertoire of nanoarchitecturing with organic molecules. The...
Exploitation of atomic‐level principles to optimize the charge transfer on ultrathin 2D heterostructures is an emerging frontier in relieving the energy and environmental crisis. Herein, a facile “topological‐atom‐extraction” protocol is disclosed, i.e., selective extraction of Zn from ultrathin half‐unit‐cell ZnIn2S4 (HZIS) can embed thin In2O3 domain into 1.60 nm thick HZIS layer to create an atomically...
Carbon nitride consisting of the broken π‐conjugated structure (bc‐CN) is designed as the emitting layer in a blue‐violet light emitting diode (LED). The bc‐CN is prepared by a metal‐oxide (MgO) template‐assisted method, in which the low reaction temperature and nano MgO jointly control the degree of polymerization to form cyano groups and broken π‐conjugation in the bc‐CN nanosheets (bc‐CN NS) which...
Light‐Emitting Diodes
In article number 2202969, Xue‐Feng Yu, Jiahong Wang, Baomin Xu, and co‐workers report a carbon nitride synthesized by nano‐template assisted polymerization method. Since the broken π‐conjugated structure leads to the excellent dispersibility and luminescence efficiency of the carbon nitride dots, a bright blue‐violet electroluminescence light‐emitting diode is further established...
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...
2D material‐based heterostructures are constructed by stacking or spicing individual 2D layers to create an interface between them, which have exotic properties. Here, a new strategy for the in situ growth of large numbers of 2D heterostructures on the centimeter‐scale substrate is developed. In the method, large numbers of 2D MoS2, MoO2, or their heterostructures of MoO2/MoS2 are controllably grown...
2D layered molybdenum disulfide (MoS2) nanomaterials are a promising platform for biomedical applications, particularly due to its high biocompatibility characteristics, mechanical and electrical properties, and flexible functionalization. Additionally, the bandgap of MoS2 can be engineered to absorb light over a wide range of wavelengths, which can then be transformed into local heat for applications...
Use of 2D materials as buffer layers has prospects in nitride epitaxy on symmetry mismatched substrates. However, the control of lattice arrangement via 2D materials at the heterointerface presents certain challenges. In this study, the epitaxy of single‐crystalline GaN film on WS2‐glass wafer is successfully performed by using the strong polarity of WS2 buffer layer and its perfectly matching lattice...
Ultralow thermal conductivity materials have triggered much interest due to diverse applications in thermal insulation, thermal barrier coating, and especially thermoelectrics. Two dimensional (2D) indium tellurides with ultralow thermal conductivity provide a versatile platform for tailoring the heat transfer, exploring new candidates for thermoelectrics, and achieving miniature, lightweight, and...
Semiconductors
In article number 2202529, Tongbo Wei, Zhongfan Liu, Peng Gao, Zhiqiang Liu, and co‐workers find that geometry matched WS2 can provide a proper lattice potential field for nitrides epitaxial growth. By using a transferred WS2 buffer layer, a single‐crystalline GaN epilayer can be obtained on an amorphous quartz glass by heterogenous epitaxy.
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...
MXene Synthesis
In article number 2203767, Chong‐Min Koo and co‐workers show that a high temperature non‐aqueous synthesis of Ti3C2Tx can significantly enhance the reaction rate and yield of delaminated MXene flakes with high quality. Additionally, Ti3C2Tx prepared by this method is covered with more F‐terminations and exhibits high tensile strength. These findings offer new opportunities towards...
2D transition metal carbides or nitrides (MXenes) have attracted considerable attention from materials scientists and engineers owing to their physicochemical properties. Currently, MXenes are synthesized from MAX‐phase precursors using aqueous HF. Here, in order to enhance the production of MXenes, an anhydrous etching solution is proposed, consisting of dimethylsulfoxide as solvent with its high...
The production of high‐quality hexagonal boron nitride (h‐BN) is essential for the ultimate performance of 2D materials‐based devices, since it is the key 2D encapsulation material. Here, a decisive guideline is reported for fabricating high‐quality h‐BN on transition metals. It is crucial to exclude carbon from the h‐BN related process, otherwise carbon prevails over boron and nitrogen due to its...
Ultra‐Narrow Linewidth Photo‐Emitters
In article number 2204302, Khurram Shehzad, Hui Wu, Zhiming Wang, and co‐workers report that hot‐pressing bulk Selenium into nanoflakes induces structural changes in the Selenium lattice, which leads to ultra‐narrow bandwidth photoemission with full width at half maximum of 330 ± 90 μeV, an order of magnitude narrower than the other 2D materials at 300 K.
Photoluminescence (PL) in state‐of‐the‐art 2D materials suffers from narrow spectral coverage, relatively broad linewidths, and poor room‐temperature (RT) functionality. The authors report ultra‐narrow linewidth photo‐emitters (ULPs) across the visible to near‐infrared wavelength at RT in polymorphic selenium nanoflakes (SeNFs), synthesized via a hot‐pressing strategy. Photo‐emitters in NIR exhibit...
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