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Aqueous rechargeable Ni‐Fe batteries featuring an ultra‐flat discharge plateau, low cost, and outstanding safety characteristics show promising prospects for application in wearable energy storage. In particular, fiber‐shaped Ni‐Fe batteries will enable textile‐based energy supply for wearable electronics. However, the development of fiber‐shaped Ni‐Fe batteries is currently challenged by the performance of fibrous Fe‐based anode materials. In this context, this study describes the fabrication of sulfur‐doped Fe2O3 nanowire arrays (S‐Fe2O3 NWAs) grown on carbon nanotube fibers (CNTFs) as an innovative anode material (S‐Fe2O3 NWAs/CNTF). Encouragingly, first‐principle calculations reveal that S‐doping in Fe2O3 can dramatically reduce the band gap from 2.34 to 1.18 eV and thus enhance electronic conductivity. The novel developed S‐Fe2O3 NWAs/CNTF electrode is further demonstrated to deliver a very high capacity of 0.81 mAh cm−2 at 4 mA cm−2. This value is almost sixfold higher than that of the pristine Fe2O3 NWAs/CNTF electrode. When a cathode containing zinc‐nickel‐cobalt oxide (ZNCO)@Ni(OH)2 NWAs heterostructures is used, 0.46 mAh cm−2 capacity and 67.32 mWh cm−3 energy density are obtained for quasi‐solid‐state fiber‐shaped NiCo‐Fe batteries, which outperform most state‐of‐the‐art fiber‐shaped aqueous rechargeable batteries. These findings offer an innovative and feasible route to design high‐performance Fe‐based anodes and may inspire new development for the next‐generation wearable Ni‐Fe batteries. [ABSTRACT FROM AUTHOR]

In recent years, two‐dimensional (2D) ternary materials have attracted wide attention due to their novel properties which can be achieved by regulating their chemical composition with a very great degree of freedom and adjustable space. However, as for the precise synthesis of 2D ternary materials, great challenges still lie ahead that hinder their further development. In this work, we demonstrated a simple and reliable approach to synthesize 2D ternary‐layered BiOCl crystals through a microwave‐assisted space‐confined process in a short time (<3 minutes). Their ultraviolet (UV) detection performance was analyzed systematically. The photodetectors based on the as‐obtained BiOCl platelets demonstrate high sensitivity to 266‐nm laser illumination. The responsivity is calculated to be ∼8 A/W and the response time is up to be ∼18 ps. On the other hand, the device is quite stable after being exposed in the ambient air within 3 weeks and the response is almost unchanged during the measurement. The facile and fast synthesis of single crystalline BiOCl platelets and its high sensitivity to UV light irradiation indicate the potential optoelectronic applications of 2D BiOCl photodetectors. [ABSTRACT FROM AUTHOR]

This study investigated the adsorption of particulate matter with a diameter <2.5 µm (PM2.5) by leaves of ten tree species in Shenyang city. An aerosol generator was used to quantitatively determine PM2.5 adsorption capacity. Atomic force microscopy was used to determine the micro-morphological characteristics of the leaf surface, including roughness parameters and the PM2.5 absorption mechanism of the tree leaves. The results showed a positive correlation between PM2.5 adsorption capacity and PM2.5 concentration during different months: October (0.618 ± 0.16 μg· cm−2) > September (0.514 ± 0.14 μg· cm−2) > July (0.509 ± 0.14 μg· cm−2) > August (0.487 ± 0.12 μg· cm−2) > June (0.464 ± 0.08 μg· cm−2) > May (0.359 ± 0.08 μg· cm−2). PM2.5 absorption capacity was higher on leaves where the folded leaf lamina was covered by fine hairs, as they were rough with many protrusions and fillisters on the leaf surface. The tree species with a smooth leaf surface and low stomatal density and stomatal opening had a weak ability to adsorb PM2.5. The average roughness of the leaves was ranked according to PM2.5 adsorption per unit leaf area, and leaf roughness was significantly correlated with PM2.5 adsorption capacity per unit leaf area (R2 = 0.706). Tree species with a leaf surface morphology that facilitates absorption of PM2.5 and other particles, such as Pinus tabulaeformis and Platycladus orientalis, should be selected to improve the environmental effects of urban forest on air quality. [ABSTRACT FROM AUTHOR]

Abstract: The charge transfer between molecules and materials can modulate the polarizability tensor of the molecules and lead to an enhancement of the Raman scattering. Surface‐enhanced Raman scattering on in‐plane anisotropic layered materials has suggested the crystalline‐axis‐dependent charge interactions between molecules and materials. However, the full understanding of the anisotropic charge transfer process is still lacking. The rigorous anisotropic nature and structural diversity of single‐walled carbon nanotube (SWNT) provide an ideal platform to systematically study the anisotropic charge transfer process. The present work reports the anisotropic Raman enhancement effect of molecules on horizontally aligned SWNT arrays and attribute it to the charge transfer efficiency that depends on the laser polarization direction and the resonance of SWNTs. The Raman signal of probe molecules on SWNT arrays is enhanced and reaches the maximum intensity when the incident laser is polarized along the SWNT axial direction, and the intensity is the minimum if they are perpendicular to each other. The different efficiencies of charge transfer are further confirmed by polarized optical absorption measurements and the energy alignment analysis. The present work provides a sensitive way to study the tunable charge interactions between molecules and anisotropic low‐dimensional materials, which are also important for polarization‐controlled optoelectronic applications. [ABSTRACT FROM AUTHOR]

For the application of single-walledcarbon nanotubes (SWNTs) in nanoelectronic devices, techniques toobtain horizontally aligned semiconducting SWNTs (s-SWNTs) with higherdensities are still in their infancy. We reported herein a rationalapproach for the preferential growth of densely packed and well-aligneds-SWNTs arrays using oxygen-deficient TiO2nanoparticlesas catalysts. Using this approach, a suitable concentration of oxygenvacancies in TiO2nanoparticles could form by optimizingthe flow rate of hydrogen and carbon sources during the process ofSWNT growth, and then horizontally aligned SWNTs with the densityof ∼10 tubes/μm and the s-SWNT percentage above 95% weresuccessfully obtained on ST-cut quartz substrates. Theoretical calculationsindicated that TiO2nanoparticles with a certain concentrationof oxygen vacancies have a lower formation energy between s-SWNT thanmetallic SWNT (m-SWNT), thus realizing the preferential growth ofs-SWNT arrays. Furthermore, this method can also be extended to othersemiconductor oxide nanoparticles (i.e., ZnO, ZrO2andCr2O3) for the selective growth of s-SWNTs,showing clear potential to the future applications in nanoelectronics. [ABSTRACT FROM AUTHOR]

The emergence of 2D van der Waals (vdW) materials, owing to highly tunable electrical conductivity, remarkably free stackability, and excellent compatibility for heterojunction integration, has provided abundant research diversity of artificial synapses. Here, an innovative 2D vdW heterosynaptic memtransistor (vdW‐HT) synapse is proposed with a ferroelectric CuInP2S6 inserted layer. Neuromorphic synaptic weight change of the vdW‐HT synapse in this work are modulated by the synergistic effects of interlayer coupling and ferroelectric polarization reversal. It is the first time to evaluate the required initial energy consumption of ferroelectric vdW‐HT synapses with matrixed biomimetic characteristics of “Learning–Forgetting–Re‐learning–Memorizing.” The required initial energy consumption is only ≈3.06 pJ, which provided supporting evidence to indicate the promising potential of vdW‐HT synapses in exploring neuromorphic applications. A vdW‐HT computing system with artificial recognition capability for intelligent automobiles is established and demonstrated outstanding recognition abilities for multiple targets in various environments. The highest recognition accuracy for pedestrians is 98%. In addition, the excellent recognition property is integrated with a robotic arm, successfully achieving high‐precision grasping behavior and designated position transmission for identified targets. These results provide promising strategies for the integrated development of emerging neuromorphic electronics and industrial applications. [ABSTRACT FROM AUTHOR]

Transparent wood (TW) combining unique anisotropic structure has broad application prospects in the field of advanced building furniture materials. Many efforts have been made to add quantum dots or nanoparticles to TW to endow it with additional functionality, such as luminescent, electrochromic, and thermochromic TW. However, luminous TW with shape‐editable functionality and its new applications have yet to be explored. Benefiting from the excellent luminescence performance in a diluted solution state, BODIPY (4,4‐difluoro‐4‐bora‐3a,4a‐diazas‐indacene) dyes have been widely used for bio‐sensing and bioimaging. In addition, vitrimers exhibit excellent stimuli‐responsive, shape‐memory, and reprocessing properties thanks to exchangeable dynamic covalent crosslinking networks, which are suitable for fabricating smart TW. Herein, combing these advantages, a dual‐functional transparent wood composite (P‐SEFTW) with photoluminescent and shape editable function was developed by introducing BODIPY dyes and vitrimers into the delignified wood (DW) templates. P‐SEFTW displays good UV luminescence, unique light guiding and directional scattering effects. Meanwhile, it shows excellent shape‐recovery, shape‐programming, shape‐erasing, and re‐programming capability under thermal‐stimulus. These characteristics enable TW to exhibit great prospect as an advanced smart and functional building material. [ABSTRACT FROM AUTHOR]

High current carrying capacity and high conductivity are two important indicators for materials used in microscale electronics and inverters. However, it is challenging to obtain high conductivity and high current carrying capacity at the same time since high conductivity requires a weakly bonded system to provide free electrons, while high current carrying capacity requires a strongly bonded system. In this paper, CuI@SWCNT networks by filling the single‐walled carbon nanotubes (SWCNTs) with CuI is ingeniously prepared. CuI@SWCNT shows good stability due to the confinement protection of SWCNTs. Through the host‐guest hybridization, CuI@SWCNT networks exhibit a current carrying capacity of 2.04 × 107 A cm−2 and a conductivity of 31.67 kS m−1. Their current carrying capacity and conductivity are significantly improved compared with SWCNT. The Kelvin probe force microscopy measurements show a drop of surface potential energy after SWCNT filled with CuI, indicating that the CuI guest molecules regulate the position of the Fermi level of SWCNTs, increasing carrier concentration, achieving high conductivity and high current carrying capacity. This study offers ideas and solutions for the regulation of high‐performance carbon tube networks, which hold great promise for future applications in carbon‐based electronic devices. [ABSTRACT FROM AUTHOR]

Emerging 2D magnetic heterojunctions attract substantial interest due to their potential applications in spintronics. Achieving magnetic phase engineering with structural integrity in 2D heterojunctions is of paramount importance for their magnetism manipulation. Herein, starting with chromium ditelluride (CrTe2) as the backbone framework, various lateral and vertical magnetic heterojunctions are obtained via self‐intercalated 2D chromium telluride (CrxTey). A Cr2Te3‐Cr5Te8 lateral heterojunction prototype is demonstrated for the manipulation of magnetic moments under different magnitudes of magnetic excitation, showing a sharply stepped hysteresis loop with a dual spin‐flip transition at high Curie temperatures up to 150 and 210 K by magneto‐optical Kerr measurement. High‐resolution scanning transmission electron microscopy and first‐principles calculations reveal a preferred random location of Cr intercalants at the phase boundary, allowing lowering energy associated with crystal field splitting. The overall structural rigidity of chromium‐telluride heterostructure with magnetic phase decoupled behaviors is promising for 2D spintronic devices. [ABSTRACT FROM AUTHOR]

High‐density single‐walled carbon nanotube (SWNT) arrays with specific diameters are pursued as potential building blocks in future nanoelectronic devices. The direct growth of SWNT arrays on the single‐crystal substrate has proved offering densely packing high‐quality SWNTs. However, further increase of SWNT density is limited by the deactivation of the catalyst nanoparticles during chemical vapor deposition process. Moreover, an increase of array density without any structure control of SWNTs would make the benefit effect very limited. Here, a temperature‐mediated method is proposed to achieve a high‐density SWNT array with a specific diameter via continual growth of SWNTs after reactivating poisoned catalysts with high carbon capacity and appropriate size. The density of obtained SWNT array on the quartz substrate is increased by more than three times, with diameter distribution controlled ≈2 nm. This approach paves the way for the integration of SWNTs into nanodevices. [ABSTRACT FROM AUTHOR]

Highlights: Microwave absorber with nanoscale gradient structure was proposed for enhancing the electromagnetic absorption performance. Outstanding reflection loss value (−62.7 dB), broadband wave absorption (6.4 dB with only 2.1 mm thickness) in combination with flexible adjustment abilities were acquired, which is superior to other relative graded distribution structures. This strategy initiates a new method for designing and controlling wave absorber with excellent impedance matching property in practical applications. In the present paper, a microwave absorber with nanoscale gradient structure was proposed for enhancing the electromagnetic absorption performance. The inorganic–organic competitive coating strategy was employed, which can effectively adjust the thermodynamic and kinetic reactions of iron ions during the solvothermal process. As a result, Fe nanoparticles can be gradually decreased from the inner side to the surface across the hollow carbon shell. The results reveal that it offers an outstanding reflection loss value in combination with broadband wave absorption and flexible adjustment ability, which is superior to other relative graded distribution structures and satisfied with the requirements of lightweight equipment. In addition, this work elucidates the intrinsic microwave regulation mechanism of the multiscale hybrid electromagnetic wave absorber. The excellent impedance matching and moderate dielectric parameters are exhibited to be the dominative factors for the promotion of microwave absorption performance of the optimized materials. This strategy to prepare gradient-distributed microwave absorbing materials initiates a new way for designing and fabricating wave absorber with excellent impedance matching property in practical applications. [ABSTRACT FROM AUTHOR]

Preparation of electrocatalysts with high activity and low cost are essential for mass production of hydrogen. However, preparation of such catalyst are still highly challenging thus far. In this paper, we focus on preparation of a three- dimensional CNTs aerogel/MoS x catalyst by using solvothermal process. The MoS x material has been successfully combined with three- dimensional CNTs aerogel and creates a sufficient active site exposure as well as 3D conductive networks for fast charge transport. Due to this the catalyst exhibited high activity for HER with a small onset over potential of ∼150 mV, a Tafel slope of 62 mV dec −1 , and an exchange current density of 6.4 mA cm −2 . The catalysts also show excellent stability during long-term 1000 cycles and electrolysis confirm the durability of the catalyst. The enhanced performance is attributed to synergistic effects of CNTs aerogel and MoSx, which enhance the activities for both components for HER. [ABSTRACT FROM AUTHOR]

In-situ reconstruction of 2D materials' electrical charge facilitates manipulating their properties for various applications. Herein we propose on-device charge engineering to achieve high performance photodetectors. The individual PNO nanosheet device can be transformed into the (Ag)PNO device by in-situ exchanging charge in the device channel. The (Ag)PNO device achieves greatly enhanced responsivity (1141 AW−1) and detectivity (4.1*1013 Jones) at 3 V at 380 nm. This work highlights on-device charge engineering as a potential method to exploit 2D materials' fundamental properties for various applications. [Display omitted] • The individual PNO nanosheet device can be transformed into (Ag)PNO device by in-situ charge exchange in the device channel. • The (Ag)PNO device achieves greatly enhanced responsivity (1141 AW−1) and detectivity (4.1*1013 Jones) at 3 V at 380 nm. • This work highlights on-device charge engineering as a potential method to exploit materials' fundamental properties for various applications. In-situ reconstruction of 2D materials' electrical charge facilitates manipulating their properties for various applications. Herein we propose on-device charge reconstruction to achieve high-performance photodetectors. The Pb 2 Nb 3 O 10 (PNO) nanosheets are prepared by solid-phase calcination and liquid-phase exfoliation process. The individual PNO nanosheet photodetector shows high responsivity (7.2 AW−1) and detectivity (3.5*1011 Jones) at 3 V at 380 nm. The individual PNO nanosheet device can be transformed into (Ag)PNO device by in-situ exchanging charge in the device channel. The (Ag)PNO device achieves greatly enhanced responsivity (1141 AW−1) and detectivity (4.1*1013 Jones) at 3 V at 380 nm. This work highlights on-device charge engineering as a potential method to exploit 2D materials' fundamental properties for various applications. [ABSTRACT FROM AUTHOR]

Numerous research efforts have focused on the deposition and morphology control of semiconducting single-walled carbon nanotubes (s-SWCNTs) to exploit their extraordinary properties to fulfill in building next-generation electronics. However, it is difficult to realize s-SWCNT arrays at the controlled densities and alignments desired for high-performance devices. Here, we developed a novel approach to control the morphology and alignment of s-SWCNTs. Random s-SWCNT networks came into being well-aligned s-SWCNT arrays (within the alignment of 16.9°) along with the recrystallization of copper foils from polycrystalline to single-crystalline. Grain boundary migration induced motion and alignment of s-SWCNTs. In this way, high-quality s-SWCNTs were assembled into well-aligned CNT arrays on single-crystal high-index copper foils. Furthermore, theoretical calculations confirm that the strong binding energy between the s-SWCNTs and the copper edge steps leads to the orientational alignment of the s-SWCNTs on the copper surface. [Display omitted] • A new method to obtain well-aligned s-SWCNT arrays from random s-SWCNT networks. • Surface-directed alignment occurs during the recrystallization of single-crystal copper foils with high-index facets. • Strong binding energy between the s-SWCNTs and the copper edge steps results in the alignment of the s-SWCNTs on copper. [ABSTRACT FROM AUTHOR]

Carbon nanotube (CNT)/copper (Cu) composite fibers are placed great expectations as the next generation of light-weight, conductive wires. However, the electrical and mechanical performances still need to be enhanced. Herein, we demonstrate a strategy that is electrodeposition Cu on thiolated CNT fibers to solve the grand challenge which is enhancing the performance of CNT/Cu composite fibers. Thiol groups are introduced to the surface of the CNT fibers through a controllable O2 plasma carboxylation process and amide reaction. Compared with CNT/Cu composite fibers, there are 82.7% and 29.6% improvements in electrical conductivity and tensile strength of interface thiol-modification composite fibers. The enhancement mechanism is also explored that thiolated CNT fibers could make strong interactions between Cu and CNT, enhancing the electrical and mechanical performance of CNT/Cu composites. This work proposes a convenient, heat-treatment-free strategy for high-performance CNT/Cu composite fibers, which can be manufactured for large-scale production and applied to next-generation conductive wires. [ABSTRACT FROM AUTHOR]

There is a growing interest in utilizing sustainable and renewable biomass resources to construct high-performance hydrogels for flexible electronics. In this study, soybean protein isolate (SPI) with abundant functional groups was introduced into the hydrogel matrix, while the connection between SPI, MXene and the polymer network was strengthened by hydrogen bonding. The sensible strategy overcame the problems of easy oxidation, agglomeration and weak interactions that existed in the binding of conductive filler MXene nanosheets with polymer chains. The prepared composite hydrogel exhibited integrated properties of high stretchability (>800 %), excellent self-adhesive property, plasticity, injectability, cyclic stability and durability in extreme environments (-20–60°C). Noteworthily, this hydrogel demonstrated high sensitivity and stable electrical resistance response to minor changes in tension, compression, bending, and temperature. In addition, this hydrogel exhibited excellent UV isolation and perspiration properties, making it ideal for practical applications of flexible devices in sports environments. The preparation of green, multipurpose, flexible electronics and human motion monitoring devices is made easier by the practical approach in this study. [Display omitted] • A bio-based reinforced hydrogel with notably enhanced stretchability is developed. • The composite hydrogel exhibits excellent strain/temperature sensing properties. • The UV isolation and perspiration properties make it more suitable for movement. • The synergistic effect of two components improves hydrogel internal structure. • The composite hydrogel has good adhesion to various materials. [ABSTRACT FROM AUTHOR]

Sample suspension is a valuable method to improve the mechanical, thermal, electronic, and optical properties of low-dimensional materials. In terms of confined light-matter waves—the polaritons, sample suspension can elongate the wavelength of polaritons with a positive phase velocity. Previous work demonstrates a wavelength elongation of ∼10% for hyperbolic phonon polaritons (HPPs) in uniaxial crystals of hexagonal boron nitride (hBN). In this work, we report the alteration of HPPs in biaxial α-phase molybdenum trioxide (α-MoO3) by sample suspension. Our combined infrared nano-imaging experiments and electromagnetic theory reveal a wavelength elongation > 60% and a propagation length increase > 140%, due to the simultaneous wavelength elongation and dissipation elimination in the suspended specimen. We have also examined HPPs in α-MoO3 with a negative phase velocity. The sample suspension shortens the HPP wavelength and simultaneously reduces the dissipation due to the unique permittivity tensor. The HPPs with improved figures of merits in the suspended specimen may be developed for nano-polaritonic circuits, biochemical sensing, emission engineering, and energy transfer. [ABSTRACT FROM AUTHOR]

Rechargeable zinc-ion batteries (ZIBs) have garnered the attention of numerous researchers due to their environmentally friendly features, high safety, and abundance of raw materials. In this study, we present a zinc-manganese oxide (defined as Zn/NaMnO) battery system that employs the layered monocrystalline hexagonal phase, δ-MnO 2 , as the cathode, synthesized via the molten salt-assisted method. Our findings demonstrate that the ultra-thin δ-phase monocrystalline structure augments the active sites of electrochemical reaction, enhances surface interface interactions, and facilitates H+ diffusion kinetics, thus promoting high-rate performance. The Zn/NaMnO battery exhibits impressive capacity (335 mA h g−1 at 0.5 C) and ultra-long cycling stability at high current density (4000 stable cycles at 20 C with 90 % capacity retention). This work provides a novel methodology for the development of rechargeable ZIBs systems with excellent performance and mass production potential. • The Na+ pre-intercalated MnO 2 (NaMnO) nanosheets synthesized by molten salt-assisted method with mass production. • Monocrystalline hexagonal NaMnO nanosheets with stable structure and fast electron transport. • The special two-dimensional structure facilitates the storage of H+ and improves the rate performance. • Capacity of NaMnO nanosheets was up to 335 mA h g−1 in battery test. • NaMnO nanosheets exhibit high stability after 4000 cycles at current density of 20 C. [ABSTRACT FROM AUTHOR]

Palladium nanoparticles (Pd NPs) decorated on a new wood-based covalent organic framework materials for efficient catalytic reduction of methylene blue (MB) and 4-nitrophenol (4-NP). [Display omitted] • This is the first example of wood-based COF material as catalytic reactor. • COF can be used as supports for immobilizing Pd NPs to improve catalytic activity. • The Pd@COF/wood displays catalytic activity for the reduction of 4-NP and MB. • The Pd@COF/wood exhibits excellent oil–water separation performance. • The Pd@COF/wood filter shows promising as scalable, efficient and reusable. With the development of industry, environmental pollution has become increasingly serious. The removal of contaminants from wastewater remains an important challenge for environmental remediation. However, many nanomaterials with excellent properties are in powder form, which limits their practical application. To overcome these issues, we have developed a three-dimensional (3D) wood membrane (Pd@COF/wood) decorated with covalent organic frameworks (COFs) and palladium nanoparticles (Pd NPs) for the effective removal of aromatic organic pollutants. The COF with a large specific surface area can be used as support for immobilizing Pd NPs to improve catalytic activity. Benefiting from the elongated and partially aligned channels along the direction of the wood growth, the Pd@COF/wood displays superior catalytical efficiency for the reduction of 4-nitrophenol (4-NP) and methylene blue (MB) with the reaction rate constants of 0.72 and 0.85 min−1, respectively. As the filter membrane, the MB degradation efficiency of the Pd@COF/wood membrane reaches over 98 % with a permeance of 1.57 × 104 L·m−2·h−1·bar−1. Meanwhile, the resulting Pd@COF/wood possesses exceptional recyclability and oil–water separation ability. We believe that the Pd@COF/wood is of great significance for environmental remediation, and the synthetic strategy is applicable to establish more multifunctional hybrid nanomaterials, which derive from other COFs and NPs for catalysis. [ABSTRACT FROM AUTHOR]

Biomass adhesives show great potential in developing environment-friendly wood-based panel industry. Among them, soybean protein isolate (SPI) adhesives have a wide source of raw materials, but exploring high-strength, water-resistant, mildew-proof soybean protein-based adhesives remains a tremendous challenge. Inspired by the spatial structure arrangement of spider silk in nature, a facile and efficient bionic approach is adopted to prepare soybean protein adhesive with excellent overall performance by introducing chitosan (CS) and MXene nanosheets in soybean protein. The addition of MXene nanosheets is expected to form the β-sheet crystalline conformation of spider silk, which contributes to the formation of a tightly cross-linked adhesive system that hinders the penetration of moisture. Compared with the 1-SPI adhesive, the prepared 5-SPI/CS/MXene adhesive shows an increase of 175% in wet shear strength (1.76 MPa), indicating excellent adhesion strength and water resistance. Besides, the addition of CS benefits to improve the dispersibility of MXene in the adhesive system. Therefore, the synergy of MXene and CS significantly improves the strength, water resistance of the adhesive and increases the storage time from 7 d to more than 50 d. This research would provide a new idea for the preparation of biomass-based adhesives. [Display omitted] • Aunique β-sheet structure of spider silk is constructed through simple method. • The prepared SPI/CS/MXene adhesive shows excellent wet shear strength (1.76 MPa). • Uniform dispersion of MXene in adhesive improves the toughness via load transfer. • The adhesive possesses excellent mildew resistance due to the CS and MXene. • The synergistic effect of CS and MXene optimizes the structure of the protein. [ABSTRACT FROM AUTHOR]

An unprecedented polyoxometalate-based metal-organic frameworks/wood (POMOF/wood) composite material was prepared for selective filtration of cationic dyes and capture of iodine in solution and vapor. [Display omitted] • The charge of the UiO-66 was regulated by introducing POMs into the MOF matrix. • The POMOF/wood showed high removal efficiency and selective filtration for MB and GV. • Different from traditional materials, block samples are easy to be recycled and treated after adsorption. • The high capacity for iodine adsorption was achieved on POMOF/wood. • This is the first example of combining POMOFs with wood. Environmental contaminants have become a major global issue in recent years. Adsorption has been considered as one of the most effective methods of removing contaminants from the environment. However, there are still some challenges to their practical applications, such as complex preparation, expensive cost, and low efficiency. In this study, we used solvothermal conditions to introduce polyoxometalate-based metal-organic frameworks (POMOFs) into a natural wood (POMOF/wood) for the effective removal of organic dye and iodine capture. The Keggin-type POM anions (PMo 12) with a highly negative charge were encapsulated to adjust the charge of the UiO-66 MOF, where the charge overcompensation in the POMOFs allows them to efficiently adsorb cationic dyes. Benefiting from the unique microstructure of wood, the POMOF/wood exhibits up to 94.07% and 95.23% removal efficiency for cationic dyes methylene blue (MB) and gentian violet (GV) with a permeance of 1.0×104 L·m−2·h−1·bar−1. Furthermore, the POMOF/wood has high adsorption capacity for capturing iodine, with a maximum adsorption capacity of 1232.8 mg·g−1 in vapor. We believe that a low-cost and scalable filter is advantageous for environmental remediation and this work provides a promising strategy for developing more multifunctional POMOF/wood materials. [ABSTRACT FROM AUTHOR]

[Display omitted] • The Wood/COF was prepared via a simple in-situ growth strategy. • The Wood/COF shows high removal efficiency for iodine, dye and oil in wastewater. • The block sample has excellent recyclability and durability. • The preparation process of in-situ growth is low-cost, simple and environmental-friendly. • This is the first example of combining COFs with wood. The applied performance of covalent organic frameworks (COFs) is usually limited by their powder form and poor recyclability. In this work, natural balsa wood was employed as substrate for anchoring COFs nanoparticles. By in situ growth strategy, COFs was uniformly deposited on the microchannels of wood to construct Wood/COF composite with unique porous structure. The COFs grafted on the microchannels and porous structure of wood show excellent adsorption capacity in wastewater and oil-water separation. Moreover, the composite exhibited exceptional recyclability, stability and solvent resistance performance. Such wood-based composite is environmentally friendly and low cost, and we believe it has broad applications for practical wastewater treatment. [ABSTRACT FROM AUTHOR]

The conductivity type is one of the most fundamental transport properties of semiconductors, which is usually identified by fabricating the field-effect transistor, the Hall-effect device, etc. However, it is challenging to obtain an Ohmic contact if the sample is down to nanometer-scale because of the small size and intrinsic heterogeneity. Noncontact dielectric force microscopy (DFM) can identify the conductivity type of the sample by applying a DC gate voltage to the tip, which is effective in tuning the accumulation or depletion of charge carriers. Here, we further developed a dual-modulation DFM, which simplified the conductivity type identification from multiple scan times under different DC gate voltages to a single scan under an AC gate voltage. Taking single-walled carbon nanotubes as testing samples, the semiconducting-type sample exhibits a more significant charge carrier accumulation/depletion under each half-period of the AC gate voltage than the metallic-type sample due to the stronger rectification effect. The charge carrier accumulation or depletion of the p-type sample is opposite to that of the n-type sample at the same half-period of the AC gate voltage because of the reversed charge carrier type., (© 2024 Author(s). Published under an exclusive license by AIP Publishing.)

Developing devices with a wide-temperature range persistent photoconductivity (PPC) and ultra-low power consumption remains a significant challenge for optical synaptic devices used in neuromorphic computing. By harnessing the PPC properties in materials, it can achieve optical storage and neuromorphic computing, surpassing the von Neuman architecture-based systems. However, previous research implemented PPC required additional gate voltages and low temperatures, which need additional energy consumption and PPC cannot be achieved across a wide temperature range. Here, we fabricated a simple heterojunctions using zinc(II)-meso-tetraphenyl porphyrin (ZnTPP) and single-walled carbon nanotubes (SWCNTs). By leveraging the strong binding energy at the heterojunction interface and the unique band structure, the heterojunction achieved PPC over an exceptionally wide temperature range (77 K-400 K). Remarkably, it demonstrated nonvolatile storage for up to 2×10 4  s, without additional gate voltage. The minimum energy consumption for each synaptic event is as low as 6.5 aJ. Furthermore, we successfully demonstrate the feasibility to manufacture a flexible wafer-scale array utilizing this heterojunction. We applied it to autonomous driving under extreme temperatures and achieved as a high impressive accuracy rate as 94.5%. This tunable and stable wide-temperature PPC capability holds promise for ultra-low-power neuromorphic computing., (© 2024. The Author(s).)

Rechargeable lithium-ion batteries are integral to contemporary energy storage, yet current anode material systems struggle to meet the increasing demand for extended range capabilities. This work introduces a novel composite anode material composed of one-dimensional 2H-phase tin disulfide (SnS 2 ) nanoribbons enclosed within cavities of single-walled carbon nanotubes (SnS 2 @SWCNTs), achieved through precise atomic engineering. Employing aberration-corrected transmission electron microscopy, we precisely elucidated the crystal structure of SnS 2 within the confines of the SWCNTs. This deliberate design effectively addresses the inherent limitations of SnS 2 as a lithium-ion anode material, including its low electrical conductivity, considerable volume expansion effects, and unstable solid electrolyte interface membrane. Testing confirmed that SnS 2 transforms into the Li 5 Sn 2 alloy phase after full lithiation and back to SnS 2 after delithiation, showing excellent reversibility. The composite also benefits from edge effects, improving lithium storage through stronger binding and lower migration barriers, which were supported by calculations. This pioneering work advances high-performance anode materials for applications.

One-dimensional (1D) high-entropy compounds (HECs) with subnano diameters are highly attractive because long-range electron delocalization may occur along the high-entropy atomic chain, which results in extraordinary properties. Nevertheless, synthesizing such 1D HECs presents a substantial challenge, and the physicochemical attributes of these novel structures remain ambiguous. Herein, we developed a comelting-filling-freezing-modification (co-MFFM) method for synthesizing 1D high-entropy metal phosphide (HEP) by simultaneously encapsulating various metal cations within single-walled carbon nanotubes (SWCNTs) followed with a phosphorization process. The resulting 1D HEP nanowires confined within SWCNTs exhibit crucial features, including an ultrafine, high-entropy, and amorphous structure, along with a core-shell arrangement. The SWCNT as a shell could donate π electrons to 1D HEP for enhanced electron delocalization and protect 1D HEP as an atomically single-layered protective covering, thus boosting high electrocatalytic activity and stability. Moreover, the co-MFFM method demonstrates scalability for mass production and displays universal applicability to the synthesis of various 1D HECs.