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Recently, 2D materials are in great demand for various applications such as optical devices, supercapacitors, sensors, and biomedicine. MXenes as a kind of novel 2D material have attracted considerable research interest due to their outstanding mechanical, thermal, electrical, and optical properties. Especially, the excellent nonlinear optical response enables them to be potential candidates for the...
MXenes as a kind of novel 2D transition metal carbon and/or nitrogen materials are commonly prepared by etching A‐group elements (mostly groups 13 or 14) from MAX phases. Owing to the excellent optical properties, MXenes have been widely used to realize ultrafast pulses in different lasers. In article number 2006054, Jiebo Li, Han Zhang, and co‐workers review the state of the art of MXenes, where...
2D PbS nanoplatelets (NPLs) form an emerging class of photoactive materials and have been proposed as robust materials for high‐performance optoelectronic devices. However, the main drawback of PbS NPLs is the large lateral size, which inhibits their further investigations and practical applications. In this work, ultra‐small 2D PbS NPLs with uniform lateral size (11.2 ± 1.7 nm) and thickness (3.7 ±...
In article number 2004677, Han Zhang, Yang Tan, Feng Chen, and co‐workers demonstrate that the antibacterial ability against drug‐resistant bacteria can be endowed to transition metal dichalcogenides (XS2, X = Mo/W) quantum dots by sulfur vacancies, and their application in bacterial keratitis. The sulfur vacancies generated by the ion irradiation result in the one‐way electron transport from the...
Due to the widespread antibiotic‐resistant microbes and the slow development in antibiotics, innovative new antibacterial agents are eagerly desired to control infection in the resistance era. Here, it is demonstrated that the antibacterial ability against drug‐resistant bacteria can be endowed to transition metal dichalcogenides (XS2, X = Mo/W) quantum dots by sulfur vacancies, and their application...
Optical nonlinearity in 2D materials excited by spatial Gaussian laser beam is a novel and peculiar optical phenomenon, which exhibits many novel and interesting applications in optical nonlinear devices. Passive photonic devices, such as optical switches, optical logical gates, photonic diodes, and optical modulators, are the key compositions in the future all‐optical signal‐processing technologies...
The electrochemical N2 reduction reaction (NRR) is emerging as a promising alternative to the industrial Haber–Bosch process for distributed and modular production of NH3. Nevertheless, developing high‐efficiency catalysts to simultaneously realize both high activity and selectivity for the development of a sustainable NRR is very critical but extremely challenging. Here, a unique plasma‐assisted...
Van der Waals (vdW)‐integrated heterojunctions have been widely investigated in optoelectronics due to their superior photoelectric conversion capability. In this work, 0D bismuth quantum dots (Bi QDs)‐decorated 1D tellurium nanotubes (Te NTs) vdW heterojunctions (Te@Bi vdWHs) are constructed by a facile bottom‐up assembly process. Transient absorption spectroscopy suggests that Te@Bi vdWH is a promising...
The introduction of chirality into perovskite scaffolds, leading to the generation of chiral perovskites, is an immense step forward toward the development of smart optoelectronic and spintronic materials and devices. In article number 1902237, Han Zhang, Jialiang Xu, and co‐workers review the design and construction of chiral perovskites along with their optoelectronic properties.
Halide perovskites have emerged as a type of extremely promising material for their diverse chemical and electronic structures along with their brilliant optoelectronic properties. The introduction of chirality into perovskite scaffolds, generating a novel concept of chiral perovskite materials, offers an immense step forward toward the development of smart optoelectronic and spintronic materials...
2D crystals are emerging new materials in multidisciplinary fields including condensed state physics, electronics, energy, environmental engineering, and biomedicine. To employ 2D crystals for practical applications, these nanoscale crystals need to be processed into macroscale materials, such as suspensions, fibers, films, and 3D macrostructures. Among these macromaterials, fibers are flexible, knittable,...
Non‐layered tellurium (Te) is a promising material for applications in transistor and optoelectronic devices for its advantages in excellent intrinsic electronic and optoelectronic properties. However, the poor photodetection performance and relatively uncertain stability of tellurene under ambient conditions greatly limit the practical applications. In order to improve the performance of tellurene‐based...
In article number 1900902, Pu Huang, Xiuwen Zhang, Han Zhang, and co‐workers use Te@Se roll‐to‐roll nanotube heterojunctions to fabricate working electrodes for photoelectrochemical (PEC)‐type photodetection. They exhibit not only a preferably enhanced capacity for self‐powered broadband photodetection but also significantly improve photocurrent density and stability under ambient/harsh conditions,...
Conductive hydrogels are receiving increasing attention for their utility in electronic area applications requiring flexible conductors. Here, it is presented novel conductive hydrogel microfibers with alginate shells and poly (3, 4‐ethylenedioxythiophene): poly (4‐styrenesulfonate) (PEDOT: PSS) cores fabricated using a multiflow capillary microfluidic spinning approach. Based on multiflow microfluidics,...
In the growing list of 2D semiconductors as potential successors to silicon in future devices, metal‐halide perovskites have recently joined the family. Unlike other conversional 2D covalent semiconductors such as graphene, transition metal dichalcogenides, black phosphorus, etc., 2D perovskites are ionic materials, affording many distinct properties of their own, including high photoluminescence...
Defect engineering in 2D phosphorene samples is becoming an important and powerful technique to alter their properties, enabling new optoelectronic applications, particularly at the infrared wavelength region. Defect engineering in a few‐layer phosphorene sample via introduction of substrate trapping centers is realized. In a three‐layer (3L) phosphorene sample, a strong photoluminescence (PL) emission...
Wearable healthcare presents exciting opportunities for continuous, real‐time, and noninvasive monitoring of health status. Even though electrochemical and optical sensing have already made great advances, there is still an urgent demand for alternative signal transformation in terms of miniaturization, wearability, conformability, and stretchability. Mechano‐based transductive sensing, referred to...
Phosphorene has attracted great interest due to its unique electronic and optoelectronic properties owing to its tunable direct and moderate band‐gap in association with high carrier mobility. However, its intrinsic instability in air seriously hinders its practical applications, and problems of technical complexity and in‐process degradation exist in currently proposed stabilization strategies. A...
Ultraviolet (UV)‐resonant metals (e.g., aluminum) typically have low melting point to cause a fabrication difficulty in helical sculpture to generate plasmons with chiroptical activity in the UV region. In this work, using glancing angle deposition (GLAD), two new methods are devised to generate crystalline chiral Al nanostructures that have stable chiroptical response in the UV–visible region originating...
In article number 1701112, Zhifeng Huang and co‐workers report chiral aluminum nanostructures with strong, stable chiroptical activity in the UV‐visible region that are fabricated by glancing angle physical vapor deposition. The chiroptical activity originates from the hidden helicity or helicity duplication from the chiral host, and the latter can be generally adapted to diverse plasmonic metals...
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