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In article number 1704379, Shih‐Huang Tung, Wen‐Chang Chen, and co‐workers demonstrate the preparation of uniform luminous perovskite nanofibers by a one‐step core/shell electrospinning technique. The luminous electrospun nanofibers possess wide color‐tunability by varying the perovskite composition. Also, the grain size of the formed perovskite nanocrystals is largely controlled by the perovskite...
In article number 1704526, Wei Cao and co‐workers realize a metallic contact between the Ni and layered MoS2 semiconductor by introducing gold nanobuffers, leading to a substantial decrease of electric resistivity at the M/S interface. Simultaneous microscopic and spectroscopic determinations prove the formation of Ni–Au–MoS2 ternary alloy subjected to a facile wet method synthesis. The metallic M/S...
The precise integration of microscale dots and lines with controllable interfacing connections is highly important for the fabrication of functional devices. To date, the solution‐processible methods are used to fabricate the heterogeneous micropatterns for different materials. However, for increasingly miniaturized and multifunctional devices, it is extremely challenging to engineer the uncertain...
Corrugation is a ubiquitous phenomenon for graphene grown on metal substrates by chemical vapor deposition, which greatly affects the electrical, mechanical, and chemical properties. Recent years have witnessed great progress in controlled growth of large graphene single crystals; however, the issue of surface roughness is far from being addressed. Here, the corrugation at the interface of copper...
In article number 1704024, Cheolmin Park and co‐workers successfully fabricate epitaxially grown ferroelectric polymer film on semiconducting rubrene single crystal micropatterned via selective contact evaporation printing. The highly oriented lamellae with two degenerated orientations are explained by the crystallographic lattice match between the ferroelectric polymer and rubrene, giving rise to...
Phase engineering through chemical modification can significantly alter the properties of transition‐metal dichalcogenides, and allow the design of many novel electronic, photonic, and optoelectronics devices. The atomic‐scale mechanism underlying such phase engineering is still intensively investigated but elusive. Here, advanced electron microscopy, combined with density functional theory calculations,...
Sodium‐ion batteries (SIBs) have huge potential for applications in large‐scale energy storage systems due to their low cost and abundant sources. It is essential to develop new electrode materials for SIBs with high performance in terms of energy density, cycle life, and cost. Metal binary compounds that operate through conversion reactions hold promise as advanced anode materials for sodium storage...
A one‐step core/shell electrospinning technique is exploited to fabricate uniform luminous perovskite‐based nanofibers, wherein the perovskite and the polymer are respectively employed in the core and the outer shell. Such a coaxial electrospinning technique enables the in situ formation of perovskite nanocrystals, exempting the needs of presynthesis of perovskite quantum dots or post‐treatments....
Phase‐engineered type‐II metal–selenide heterostructures are demonstrated by directly selenizing indium‐tin oxide to form multimetal selenides in a single step. The utilization of a plasma system to assist the selenization facilitates a low‐temperature process, which results in large‐area films with high uniformity. Compared to single‐metal–selenide‐based photodetectors, the multimetal–selenide photodetectors...
Epitaxial crystallization of thin poly(vinylidene fluoride‐co‐trifluoroethylene) (PVDF‐TrFE) films is important for the full utilization of their ferroelectric properties. Epitaxy can offer a route for maximizing the degree of crystallinity with the effective orientation of the crystals with respect to the electric field. Despite various approaches for the epitaxial control of the crystalline structure...
Atomic force microscopy probes are proved to be powerful tools to measure and manipulate the individual cell, providing potential applications for the controlled drug/protein delivery. However, the measured insertion efficiency varies dramatically from 20 to 80%, in some cases, the nanotip can never penetrate the cell membrane no matter how much force is applied to it. Thus, the insertion mechanism...
The application fields of hydrogels are often severely limited by their weak mechanical performance. It is therefore highly demanded to develop an effective strategy to fabricate mechanically strong hydrogels. Herein, a kind of bioinspired ternary hydrogel consisting of graphene oxide (GO) nanosheets, xonotlite nanowires, and polyacrylamide (PAM) is constructed under the synergy of hydrogen bonding–induced...
The noninvasive monitoring of protein secretion of cells responding to drug treatment is an effective and essential tool in latest drug development and for cytotoxicity assays. In this work, a surface functionalization method is demonstrated for specific detection of protein released from cells and a platform that integrates highly sensitive optical devices, called whispering‐gallery mode biosensors,...
Injectable polymer microsphere‐based stem cell delivery systems have a severe problem that they do not offer a desirable environment for stem cell adhesion, proliferation, and differentiation because it is difficult to entrap a large number of hydrophilic functional protein molecules into the core of hydrophobic polymer microspheres. In this work, soybean lecithin (SL) is applied to entrap hydrophilic...
Simple stacking of thin van der Waals 2D materials with different physical properties enables one to create heterojunctions (HJs) with novel functionalities and new potential applications. Here, a 2D material p–n HJ of GeSe/MoS2 is fabricated and its vertical and horizontal carrier transport and photoresponse properties are studied. Substantial rectification with a very high contrast (>104) through...
A critical factor for electronics based on inorganic layered crystals stems from the electrical contact mode between the semiconducting crystals and the metal counterparts in the electric circuit. Here, a materials tailoring strategy via nanocomposite decoration is carried out to reach metallic contact between MoS2 matrix and transition metal nanoparticles. Nickel nanoparticles (NiNPs) are successfully...
The synthesis of Pt nanotubes catalysts remains a substantial challenge, especially for those with both sub‐nanometer wall thickness and micrometer‐scale length characteristics. Combining techniques of insulin fibril template with Pd nanowire template, numerous Pt nanotubes with diameter of 5.5 nm, tube‐length of several micrometers, and ultrathin wall thickness of 1 nm are assembled. These tubular...
For supported graphene, reliable differentiation and clear visualization of distinct graphene layers and fine features such as wrinkles are essential for revealing the structure–property relationships for graphene and graphene‐based devices. Scanning electron microscopy (SEM) has been frequently used for this purpose where high‐quality image contrast is critical. However, it is surprising that the...
In article number 1800072, Josué J. López and co‐workers use photothermal microscopy to measure the near‐field absorption of nanostructured hexagonal boron nitride (h‐BN) and reveal a large photothermal expansion in the nanostructures. This effect is attributed to the anisotropy of the thermal expansion coefficients of h‐BN and the nanostructuring implemented. The photothermal expansion should be...
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