11,802 results match your criteria Adv. Mater. Weinheim[Journal]


Identifying Dense NiSe /CoSe Heterointerfaces Coupled with Surface High-Valence Bimetallic Sites for Synergistically Enhanced Oxygen Electrocatalysis.

Adv Mater 2020 May 27:e2000607. Epub 2020 May 27.

School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology of the Ministry of Education, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China.

Constructing heterostructures with abundant interfaces is essential for integrating the multiple functionalities in single entities. Herein, the synthesis of NiSe /CoSe heterostructures with different interfacial densities via an innovative strategy of successive ion injection is reported. The resulting hybrid electrocatalyst with dense heterointerfaces exhibits superior electrocatalytic properties in an alkaline electrolyte, superior to other benchmarks and precious metal catalysts. Read More

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http://dx.doi.org/10.1002/adma.202000607DOI Listing

A General Hypoxia-Responsive Molecular Container for Tumor-Targeted Therapy.

Adv Mater 2020 May 27:e1908435. Epub 2020 May 27.

College of Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China.

Enhanced drug delivery can improve the therapeutic efficacy of drugs and help overcome side effects. However, many reported drug-delivery systems are too complex and irreproducible for practical use. In this work, the design of a hypoxia-responsive molecular container based on calixarene, called CAC4A, which presents a significant advance in practical, hypoxia-targeted drug-delivery, is reported. Read More

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http://dx.doi.org/10.1002/adma.201908435DOI Listing

Designing Outside the Box: Unlocking the Geometric Freedom of Melt Electrowriting using Microscale Layer Shifting.

Adv Mater 2020 May 27:e2001874. Epub 2020 May 27.

Department of Functional Materials in Medicine and Dentistry and Bavarian Polymer Institute, University Hospital of Würzburg, Pleicherwall 2, Würzburg, 97070, Germany.

Melt electrowriting, a high-resolution additive manufacturing technology, has so far been developed with vertical stacking of fiber layers, with a printing trajectory that is constant for each layer. In this work, microscale layer shifting is introduced through deliberately offsetting the printing trajectory for each printed layer. Inaccuracies during the printing of sinusoidal walls are corrected via layer shifting, resulting in accurate control of their geometry and mechanical properties. Read More

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http://dx.doi.org/10.1002/adma.202001874DOI Listing

Chemical Bonding in Chalcogenides: The Concept of Multicenter Hyperbonding.

Adv Mater 2020 May 27:e2000340. Epub 2020 May 27.

Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.

The precise nature of chemical-bonding interactions in amorphous, and crystalline, chalcogenides is still unclear due to the complexity arising from the delocalization of bonding, and nonbonding, electrons. Although an increasing degree of electron delocalization for elements down a column of the periodic table is widely recognized, its influence on chemical-bonding interactions, and on consequent material properties, of chalcogenides has not previously been comprehensively understood from an atomistic point of view. Here, a chemical-bonding framework is provided for understanding the behavior of chalcogenides (and, in principle, other lone-pair materials) by studying prototypical telluride nonvolatile-memory, "phase-change" materials (PCMs), and related chalcogenide compounds, via density-functional-theory molecular-dynamics (DFT-MD) simulations. Read More

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http://dx.doi.org/10.1002/adma.202000340DOI Listing

Engineering Co MnAl Si Heusler Compounds as a Model System to Correlate Spin Polarization, Intrinsic Gilbert Damping, and Ultrafast Demagnetization.

Adv Mater 2020 May 26:e1908357. Epub 2020 May 26.

Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine, Nancy, 54500, France.

Engineering of magnetic materials for developing better spintronic applications relies on the control of two key parameters: the spin polarization and the Gilbert damping, responsible for the spin angular momentum dissipation. Both of them are expected to affect the ultrafast magnetization dynamics occurring on the femtosecond timescale. Here, engineered Co MnAl Si Heusler compounds are used to adjust the degree of spin polarization at the Fermi energy, P, from 60% to 100% and to investigate how they correlate with the damping. Read More

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http://dx.doi.org/10.1002/adma.201908357DOI Listing

A High-Performance Carbonate-Free Lithium|Garnet Interface Enabled by a Trace Amount of Sodium.

Adv Mater 2020 May 25:e2000575. Epub 2020 May 25.

School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong, 529020, China.

Garnet-type solid-state electrolytes (SSEs) are promising for the realization of next-generation high-energy-density Li metal batteries. However, a critical issue associated with the garnet electrolytes is the poor physical contact between the Li anode and the garnet SSE and the resultant high interfacial resistance. Here, it is reported that the Li|garnet interface challenge can be addressed by using Li metal doped with 0. Read More

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http://dx.doi.org/10.1002/adma.202000575DOI Listing

Giant Piezospintronic Effect in a Noncollinear Antiferromagnetic Metal.

Adv Mater 2020 May 25:e2002300. Epub 2020 May 25.

School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.

One of the main bottleneck issues for room-temperature antiferromagnetic spintronic devices is the small signal read-out owing to the limited anisotropic magnetoresistance in antiferromagnets. However, this could be overcome by either utilizing the Berry-curvature-induced anomalous Hall resistance in noncollinear antiferromagnets or establishing tunnel-junction devices based on effective manipulation of antiferromagnetic spins. In this work, the giant piezoelectric strain modulation of the spin structure and the anomalous Hall resistance in a noncollinear antiferromagnetic metal-D0 hexagonal Mn Ga-is demonstrated. Read More

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http://dx.doi.org/10.1002/adma.202002300DOI Listing

Localized Surface Plasmon Resonance Enhanced Light Absorption in AuCu/CsPbCl Core/Shell Nanocrystals.

Adv Mater 2020 May 25:e2002163. Epub 2020 May 25.

Department of Physics and Astronomy, University of Kansas, Lawrence, KS, 66045, USA.

Localized surface plasmon resonance (LSPR) is shown to be effective in trapping light for enhanced light absorption and hence performance in photonic and optoelectronic devices. Implementation of LSPR in all-inorganic perovskite nanocrystals (PNCs) is particularly important considering their unique advantages in optoelectronics. Motivated by this, the first success in colloidal synthesis of AuCu/CsPbCl core/shell PNCs and observation of enhanced light absorption by the perovskite CsPbCl shell of thickness in the range of 2-4 nm, enabled by the LSPR AuCu core of an average diameter of 7. Read More

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http://dx.doi.org/10.1002/adma.202002163DOI Listing

Efficient Nitrate Synthesis via Ambient Nitrogen Oxidation with Ru-Doped TiO /RuO Electrocatalysts.

Adv Mater 2020 May 25:e2002189. Epub 2020 May 25.

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

A facile pathway of the electrocatalytic nitrogen oxidation reaction (NOR) to nitrate is proposed, and Ru-doped TiO /RuO (abbreviated as Ru/TiO ) as a proof-of-concept catalyst is employed accordingly. Density functional theory (DFT) calculations suggest that Ru can function as the main active center for the NOR process. Remarkably doping Ru into the TiO lattice can induce an upshift of the d-band center of the Ru site, resulting in enhanced activity for accelerating electrochemical conversion of inert N to active NO*. Read More

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http://dx.doi.org/10.1002/adma.202002189DOI Listing

High-Safety and High-Energy-Density Lithium Metal Batteries in a Novel Ionic-Liquid Electrolyte.

Adv Mater 2020 May 25:e2001741. Epub 2020 May 25.

Department of Chemistry, Stanford University, Stanford, CA, 94305, USA.

Rechargeable lithium metal batteries are next generation energy storage devices with high energy density, but face challenges in achieving high energy density, high safety, and long cycle life. Here, lithium metal batteries in a novel nonflammable ionic-liquid (IL) electrolyte composed of 1-ethyl-3-methylimidazolium (EMIm) cations and high-concentration bis(fluorosulfonyl)imide (FSI) anions, with sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) as a key additive are reported. The Na ion participates in the formation of hybrid passivation interphases and contributes to dendrite-free Li deposition and reversible cathode electrochemistry. Read More

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http://dx.doi.org/10.1002/adma.202001741DOI Listing

Controlling Crystal Growth via an Autonomously Longitudinal Scaffold for Planar Perovskite Solar Cells.

Adv Mater 2020 May 25:e2000617. Epub 2020 May 25.

College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.

Sequential deposition is certified as an effective technology to obtain high-performance perovskite solar cells (PVSCs), which can be derivatized into large-scale industrial production. However, dense lead iodide (PbI ) causes incomplete reaction and unsatisfactory solution utilization of perovskite in planar PVSCs without mesoporous titanium dioxide as a support. Here, a novel autonomously longitudinal scaffold constructed by the interspersion of in situ self-polymerized methyl methacrylate (sMMA) in PbI is introduced to fabricate efficient PVSCs with excellent flexural endurance and environmental adaptability. Read More

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http://dx.doi.org/10.1002/adma.202000617DOI Listing

Water-Resistant Conformal Hybrid Electrodes for Aquatic Endurable Electrocardiographic Monitoring.

Adv Mater 2020 May 25:e2001496. Epub 2020 May 25.

Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

Underwater vital signs monitoring of respiratory rate, blood pressure, and the heart's status is essential for healthcare and sports management. Real-time electrocardiography (ECG) monitoring underwater can be one solution for this. However, the current electrodes used for ECGs are not suitable for aquatic applications since they may lose their adhesiveness to skin, stable conductivity, or/and structural stability when immersed into water. Read More

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http://dx.doi.org/10.1002/adma.202001496DOI Listing

Guanidinium-Assisted Surface Matrix Engineering for Highly Efficient Perovskite Quantum Dot Photovoltaics.

Adv Mater 2020 May 25:e2001906. Epub 2020 May 25.

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, P. R. China.

Metal halide perovskite quantum dots (Pe-QDs) are of great interest in new-generation photovoltaics (PVs). However, it remains challenging in the construction of conductive and intact Pe-QD films to maximize their functionality. Herein, a ligand-assisted surface matrix strategy to engineer the surface and packing states of Pe-QD solids is demonstrated by a mild thermal annealing treatment after ligand exchange processing (referred to as "LE-TA") triggered by guanidinium thiocyanate. Read More

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http://dx.doi.org/10.1002/adma.202001906DOI Listing

A Lipid-Nanopillar-Array-Based Immunosorbent Assay.

Adv Mater 2020 May 25:e2001360. Epub 2020 May 25.

Department of Chemistry, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea.

Since infectious diseases, particularly viral infections, have threatened human health and caused huge economical losses globally, a rapid, sensitive, and selective virus detection platform is highly demanded. Enzyme-linked immunosorbent assay (ELISA) with flat solid substrates has been dominantly used in detecting whole viruses for its straightforwardness and simplicity in assay protocols, but it often suffers from limited sensitivity, poor quantification range, and a time-consuming assay procedure. Here, a lipid-nanopillar-array-based immunosorbent assay (LNAIA) is developed with a nanopillar-supported lipid bilayer substrate with fluorophore-modified antibodies for rapid, sensitive, and quantitative detection of viruses. Read More

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http://dx.doi.org/10.1002/adma.202001360DOI Listing

Engineered PD-L1-Expressing Platelets Reverse New-Onset Type 1 Diabetes.

Adv Mater 2020 May 25:e1907692. Epub 2020 May 25.

Department of Bioengineering, University of California, Los Angeles, CA, 90095, USA.

The pathogenesis of Type 1 diabetes (T1D) arises from the destruction of insulin-producing β-cells by islet-specific autoreactive T cells. Inhibition of islet-specific autoreactive T cells to rescue β-cells is a promising approach to treat new-onset T1D. The immune checkpoint signal axis programmed death-1/programmed death-ligand 1 (PD-1/PD-L1) can effectively regulate the activity of T cells and prevent autoimmune attack. Read More

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http://dx.doi.org/10.1002/adma.201907692DOI Listing

Graded 2D/3D Perovskite Heterostructure for Efficient and Operationally Stable MA-Free Perovskite Solar Cells.

Adv Mater 2020 May 25:e2000571. Epub 2020 May 25.

State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, P. R. China.

Almost all highly efficient perovskite solar cells (PVSCs) with power conversion efficiencies (PCEs) of greater than 22% currently contain the thermally unstable methylammonium (MA) molecule. MA-free perovskites are an intrinsically more stable optoelectronic material for use in solar cells but compromise the performance of PVSCs with relatively large energy loss. Here, the open-circuit voltage (V ) deficit is circumvented by the incorporation of β-guanidinopropionic acid (β-GUA) molecules into an MA-free bulk perovskite, which facilitates the formation of quasi-2D structure with face-on orientation. Read More

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http://dx.doi.org/10.1002/adma.202000571DOI Listing

Regulating the Interfacial Electronic Coupling of Fe N via Orbital Steering for Hydrogen Evolution Catalysis.

Adv Mater 2020 May 25:e1904346. Epub 2020 May 25.

Hefei National Laboratory for Physical Science at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.

The capability of manipulating the interfacial electronic coupling is the key to achieving on-demand functionalities of catalysts. Herein, it is demonstrated that the electronic coupling of Fe N can be effectively regulated for hydrogen evolution reaction (HER) catalysis by vacancy-mediated orbital steering. Ex situ refined structural analysis reveals that the electronic and coordination states of Fe N can be well manipulated by nitrogen vacancies, which impressively exhibit strong correlation with the catalytic activities. Read More

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http://dx.doi.org/10.1002/adma.201904346DOI Listing

Quasi-Binary Transition Metal Dichalcogenide Alloys: Thermodynamic Stability Prediction, Scalable Synthesis, and Application.

Adv Mater 2020 May 25:e1907041. Epub 2020 May 25.

Department of Mechanical and Industrial Engineering, University of Illinois, Chicago, IL, 60607, USA.

Transition metal dichalcogenide (TMDCs) alloys could have a wide range of physical and chemical properties, ranging from charge density waves to superconductivity and electrochemical activities. While many exciting behaviors of unary TMDCs have been demonstrated, the vast compositional space of TMDC alloys has remained largely unexplored due to the lack of understanding regarding their stability when accommodating different cations or chalcogens in a single-phase. Here, a theory-guided synthesis approach is reported to achieve unexplored quasi-binary TMDC alloys through computationally predicted stability maps. Read More

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http://dx.doi.org/10.1002/adma.201907041DOI Listing

Tuning the Kinetics of Zinc-Ion Insertion/Extraction in V O by In Situ Polyaniline Intercalation Enables Improved Aqueous Zinc-Ion Storage Performance.

Adv Mater 2020 May 20:e2001113. Epub 2020 May 20.

School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China.

Rechargeable zinc-ion batteries (ZIBs) are emerging as a promising alternative for Li-ion batteries. However, the developed cathodes suffer from sluggish Zn diffusion kinetics, leading to poor rate capability and inadequate cycle life. Herein, an in situ polyaniline (PANI) intercalation strategy is developed to facilitate the Zn (de)intercalation kinetics in V O . Read More

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http://dx.doi.org/10.1002/adma.202001113DOI Listing

Continuous "Snowing" Thermotherapeutic Graphene.

Adv Mater 2020 May 19:e2002024. Epub 2020 May 19.

Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.

Finding the best applications of graphene, and the continuous and scalable preparation of graphene with high quality and high purity, are still two major challenges. Herein, a "pulse-etched" microwave-induced "snowing" (PEMIS) process is developed for continuous and scalable preparation of high-quality and high-purity graphene directly in the gas phase, which is found to have excellent thermotherapeutic effects. The obtained graphene exhibits small size (≈180 nm), high quality, low oxygen content, and high purity, together with a high gas-solid conversion efficiency of ≈10. Read More

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http://dx.doi.org/10.1002/adma.202002024DOI Listing

Recent Advances on High-Entropy Alloys for 3D Printing.

Adv Mater 2020 May 20:e1903855. Epub 2020 May 20.

Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

Boosted by the success of high-entropy alloys (HEAs) manufactured by conventional processes in various applications, the development of HEAs for 3D printing has been advancing rapidly in recent years. 3D printing of HEAs gives rise to a great potential for manufacturing geometrically complex HEA products with desirable performances, thereby inspiring their increased appearance in industrial applications. Herein, a comprehensive review of the recent achievements of 3D printing of HEAs is provided, in the aspects of their powder development, printing processes, microstructures, properties, and potential applications. Read More

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http://dx.doi.org/10.1002/adma.201903855DOI Listing

A Bottom-Up Strategy for the Synthesis of Highly Siliceous Faujasite-Type Zeolite.

Adv Mater 2020 May 20:e2000272. Epub 2020 May 20.

National Engineering Laboratory for Methanol to Olefins, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China.

High-silica zeolite Y is a desired catalytic material for oil refining and the petrochemical industry. However, its direct synthesis remains a symbolic challenge in the field of zeolite synthesis, with a limited improvement of the framework SiO /Al O ratio (SAR) from ≈5 to 9 over the past 60 years. Here, the synthesis of highly siliceous zeolite Y with tunable SAR up to 15. Read More

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http://dx.doi.org/10.1002/adma.202000272DOI Listing

Spin-Selective Full-Dimensional Manipulation of Optical Waves with Chiral Mirror.

Adv Mater 2020 May 20:e1907983. Epub 2020 May 20.

The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and TEDA Institute of Applied Physics, Renewable Energy Conversion and Storage Center, Nankai University, Tianjin, 300071, China.

Realizing arbitrary manipulation of optical waves, which still remains a challenge, plays a key role in the implementation of optical devices with on-demand functionalities. However, it is hard to independently manipulate multiple dimensions of optical waves because the optical dimensions are basically associated with each other when adjusting the optical response of the devices. Here, the concise design principle of a chiral mirror is utilized to realize the full-dimensional independent manipulation of circular-polarized waves. Read More

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http://dx.doi.org/10.1002/adma.201907983DOI Listing

Strategies for High-Performance Solid-State Triplet-Triplet-Annihilation-Based Photon Upconversion.

Adv Mater 2020 May 19:e1908175. Epub 2020 May 19.

Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.

Photon upconversion via triplet-triplet annihilation (TTA) has achieved high efficiencies in solution and within polymer matrices that support molecular migration systems. It has diverse potential applications including bioimaging, optical sensors, and photovoltaics. To date, however, the reported performance of TTA in rigid solid-state systems is substantially inferior, which may complicate the integration of TTA in other solid-state devices. Read More

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http://dx.doi.org/10.1002/adma.201908175DOI Listing

Bioinspired Soft Microrobots with Precise Magneto-Collective Control for Microvascular Thrombolysis.

Adv Mater 2020 May 20:e2000366. Epub 2020 May 20.

School of Electronics and Information Engineering, Tongji University, 4800 Caoan Road, Shanghai, 201804, China.

New-era soft microrobots for biomedical applications need to mimic the essential structures and collective functions of creatures from nature. Biocompatible interfaces, intelligent functionalities, and precise locomotion control in a collective manner are the key parameters to design soft microrobots for the complex bio-environment. In this work, a biomimetic magnetic microrobot (BMM) inspired by magnetotactic bacteria (MTB) with speedy motion response and accurate positioning is developed for targeted thrombolysis. Read More

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http://dx.doi.org/10.1002/adma.202000366DOI Listing

Ferroelectric Sr Sn O :Nd : A New Multipiezo Material with Ultrasensitive and Sustainable Near-Infrared Piezoluminescence.

Adv Mater 2020 May 20:e1908083. Epub 2020 May 20.

Faculty of Science and Engineering, Saga University, Saga, 840-8502, Japan.

Ultrasensitive and sustainable near-infrared (NIR)-emitting piezoluminescence is observed from noncentrosymmetric and ferroelectric-phase Sr Sn O doped with rare earth Nd ions. Sr Sn O :Nd (SSN) with polar A2 am structure is demonstrated to emit piezoluminescence of wavelength of 800-1500 nm at microstrain levels, which is enhanced by the ferroelectrically polarized charges in the multipiezo material. These discoveries provide new research opportunities to study luminescence properties of multipiezo and piezo-photonic materials, and to explore their potential as novel ultrasensitive probes for deep-imaging of stress distributions in diverse materials and structures including artificial bone and other implanted structures (in vivo, in situ, etc). Read More

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http://dx.doi.org/10.1002/adma.201908083DOI Listing

From Responsive Molecules to Interactive Materials.

Adv Mater 2020 May;32(20):e2000215

DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany.

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http://dx.doi.org/10.1002/adma.202000215DOI Listing

On the Mechanistic Understanding of Photovoltage Loss in Iron Pyrite Solar Cells.

Adv Mater 2020 May 19:e1905653. Epub 2020 May 19.

Department of Engineering Sciences, Division of Solid State Physics, Angstrom Laboratory, Uppsala University, Uppsala, 751 21, Sweden.

Considering the natural abundance, the optoelectronic properties, and the electricity production cost, iron pyrite (FeS ) has a strong appeal as a solar cell material. The maximum conversion efficiency of FeS solar cells demonstrated to date, however, is below 3%, which is significantly below the theoretical efficiency limit of 25%. This poor conversion efficiency is mainly the result of the poor photovoltage, which has never exceeded 0. Read More

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http://dx.doi.org/10.1002/adma.201905653DOI Listing

Atomic Engineering Catalyzed MnO Electrolysis Kinetics for a Hybrid Aqueous Battery with High Power and Energy Density.

Adv Mater 2020 May 19:e2001894. Epub 2020 May 19.

School of Chemical Engineering & Advanced Materials, The University of Adelaide, Adelaide, SA, 5005, Australia.

Research interest and achievements in zinc aqueous batteries, such as alkaline Zn//Mn, Zn//Ni/Co, Zn-air batteries, and near-neutral Zn-ion and hybrid ion batteries, have surged throughout the world due to their features of low-cost and high-safety. However, practical application of Zn-based secondary batteries is plagued by restrictive energy and power densities in which an inadequate output plateau voltage and sluggish kinetics are mutually accountable. Here, a novel paradigm high-rate and high-voltage Zn-Mn hybrid aqueous battery (HAB) is constructed with an expanded electrochemical stability window over 3. Read More

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http://dx.doi.org/10.1002/adma.202001894DOI Listing

Honeycomb RhI Flakes with High Environmental Stability for Optoelectronics.

Adv Mater 2020 May 17:e2001979. Epub 2020 May 17.

State Key Laboratory of Material Processing and Die and Mould Technology, School of Material Sciences and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.

The emerging 2D layered transition metal trihalides (MX ) have attracted extremely high interest given their exceptional structural and physical properties. Continuing to extend the library of 2D MX is essential for exploring new physical phenomena and enabling new functionality. Herein, the optical and electrical properties and the photodetection behavior of atomically thin RhI flakes exfoliated from bulk crystals are reported. Read More

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http://dx.doi.org/10.1002/adma.202001979DOI Listing

3D Printing of Micrometer-Sized Transparent Ceramics with On-Demand Optical-Gain Properties.

Adv Mater 2020 May 17:e2001675. Epub 2020 May 17.

Casali Center for Applied Chemistry, Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.

Transparent ceramics are usually polycrystalline materials, which are wildly used in many optical applications, such as lasers. As of today, the fabrication of transparent ceramic structures is still limited to conventional fabrication methods, which do not enable the formation of complex structures. A new approach for 3D printing of micrometer-size, transparent ceramic structures is presented. Read More

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http://dx.doi.org/10.1002/adma.202001675DOI Listing

Imprinting Ferromagnetism and Superconductivity in Single Atomic Layers of Molecular Superlattices.

Adv Mater 2020 May 17:e1907645. Epub 2020 May 17.

Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.

Ferromagnetism and superconductivity are two antagonistic phenomena since ferromagnetic exchange fields tend to destroy singlet Cooper pairs. Reconciliation of these two competing phases has been achieved in vertically stacked heterostructures where these two orders are confined in different layers. However, controllable integration of these two phases in one atomic layer is a longstanding challenge. Read More

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http://dx.doi.org/10.1002/adma.201907645DOI Listing

3D Printing of Viscoelastic Suspensions via Digital Light Synthesis for Tough Nanoparticle-Elastomer Composites.

Adv Mater 2020 May 17:e2001646. Epub 2020 May 17.

Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA.

The rheological parameters required to print viscoelastic nanoparticle suspensions toward tough elastomers via Digital Light Synthesis (DLS) (an inverted projection stereolithography system) are reported. With a model material of functionalized silica nanoparticles suspended in a poly(dimethylsiloxane) matrix, the rheological-parameters-guided DLS can print structures seven times tougher than those formed from the neat polymers. The large yield stress and high viscosity associated with these high concentration nanoparticle suspensions, however, may prevent pressure-driven flow, a mechanism essential to stereolithography-based printing. Read More

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http://dx.doi.org/10.1002/adma.202001646DOI Listing

Multicompartment Tubular Micromotors Toward Enhanced Localized Active Delivery.

Adv Mater 2020 May 17:e2000091. Epub 2020 May 17.

Department of Nanoengineering, University of California San Diego, La Jolla, CA, 92093, USA.

A tubular micromotor with spatially resolved compartments is presented toward efficient site-specific cargo delivery, with a back-end zinc (Zn) propellant engine segment and an upfront cargo-loaded gelatin segment further protected by a pH-responsive cap. The multicompartment micromotors display strong gastric-powered propulsion with tunable lifetime depending on the Zn segment length. Such propulsion significantly enhances the motor distribution and retention in the gastric tissues, by pushing and impinging the front-end cargo segment onto the stomach wall. Read More

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http://dx.doi.org/10.1002/adma.202000091DOI Listing

Metal-Free Hydrogen-Bonded Polymers Mimic Noble Metal Electrocatalysts.

Adv Mater 2020 May 17:e1902177. Epub 2020 May 17.

Institute of Physical Chemistry and Linz Institute of Technology, Johannes Kepler University Linz, Altenberger Strasse 69, Linz, 4040, Austria.

The most active and efficient catalysts for the electrochemical hydrogen evolution reaction (HER) rely on platinum, a fact that increases the cost of producing hydrogen and thereby limits the widespread adoption of this fuel. Here, a metal-free organic electrocatalyst that mimics the platinum surface by implementing a high work function and incorporating hydrogen-affine hydrogen bonds is introduced. These motifs, inspired from enzymology, are deployed here as selective reaction centres. Read More

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http://dx.doi.org/10.1002/adma.201902177DOI Listing

Structured Perovskite Light Absorbers for Efficient and Stable Photovoltaics.

Adv Mater 2020 May 18:e1903937. Epub 2020 May 18.

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.

Organic-inorganic hybrid lead-halide perovskite materials (ABX ) have attracted widespread attention in the field of photovoltaics owing to their impressive optical and electrical properties. However, obstacles still exist in the commercialization of perovskite photovoltaics, such as poor stability, hysteresis, and human toxicity. A-site cation engineering is considered to be a powerful tool to tune perovskite structures and the resulting optoelectronic properties. Read More

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http://dx.doi.org/10.1002/adma.201903937DOI Listing

Low-Voltage Reversible Electroadhesion of Ionoelastomer Junctions.

Adv Mater 2020 May 17:e2000600. Epub 2020 May 17.

Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA, 01003, USA.

Electroadhesion provides a simple route to rapidly and reversibly control adhesion using applied electric potentials, offering promise for a variety of applications including haptics and robotics. Current electroadhesives, however, suffer from key limitations associated with the use of high operating voltages (>kV) and corresponding failure due to dielectric breakdown. Here, a new type of electroadhesion based on heterojunctions between iono-elastomer of opposite polarity is demonstrated, which can be operated at potentials as low as ≈1 V. Read More

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http://dx.doi.org/10.1002/adma.202000600DOI Listing

Embedded Metal Oxide Plasmonics Using Local Plasma Oxidation of AZO for Planar Metasurfaces.

Adv Mater 2020 May 17:e2001534. Epub 2020 May 17.

Astronomy and Physics, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK.

New methods for achieving high-quality conducting oxide metasurfaces are of great importance for a range of emerging applications from infrared thermal control coatings to epsilon-near-zero nonlinear optics. This work demonstrates the viability of plasma patterning as a technique to selectively and locally modulate the carrier density in planar Al-doped ZnO (AZO) metasurfaces without any associated topographical surface profile. This technique stands in strong contrast to conventional physical patterning which results in nonplanar textured surfaces. Read More

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http://dx.doi.org/10.1002/adma.202001534DOI Listing

Stable Rhodium (IV) Oxide for Alkaline Hydrogen Evolution Reaction.

Adv Mater 2020 May 17:e1908521. Epub 2020 May 17.

Institute of New-Energy Materials, School of Materials Science and Engineering, Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China.

Water electrolysis in alkaline electrolyte is an attractive way toward clean hydrogen energy via the hydrogen evolution reaction (HER), whereas the sluggish water dissociation impedes the following hydrogen evolution. Noble metal oxides possess promising capability for catalyzing water dissociation and hydrogen evolution; however, they are never utilized for the HER due to the instability under the reductive potential. Here it is shown that compressive strain can stabilize RhO clusters and promote their catalytic activity. Read More

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http://dx.doi.org/10.1002/adma.201908521DOI Listing

General Decomposition Pathway of Organic-Inorganic Hybrid Perovskites through an Intermediate Superstructure and its Suppression Mechanism.

Adv Mater 2020 May 17:e2001107. Epub 2020 May 17.

Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, 100871, China.

Organic-inorganic hybrid perovskites (OIHPs) have generated considerable excitement due to their promising photovoltaic performance. However, the commercialization of perovskite solar cells (PSCs) is still plagued by the structural degradation of the OIHPs. Here, the decomposition mechanism of OIHPs under electron beam irradiation is investigated via transmission electron microscopy, and a general decomposition pathway for both tetragonal CH NH PbI and cubic CH NH PbBr is uncovered through an intermediate superstructure state of CH NH PbX , X = I, Br, with ordered vacancies into final lead halides. Read More

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http://dx.doi.org/10.1002/adma.202001107DOI Listing

Liquid-Phase Electron Microscopy for Soft Matter Science and Biology.

Adv Mater 2020 May 17:e2001582. Epub 2020 May 17.

INM - Leibniz Institute for New Materials, Saarbrücken, 66123, Germany.

Innovations in liquid-phase electron microscopy (LP-EM) have made it possible to perform experiments at the optimized conditions needed to examine soft matter. The main obstacle is conducting experiments in such a way that electron beam radiation can be used to obtain answers for scientific questions without changing the structure and (bio)chemical processes in the sample due to the influence of the radiation. By overcoming these experimental difficulties at least partially, LP-EM has evolved into a new microscopy method with nanometer spatial resolution and sub-second temporal resolution for analysis of soft matter in materials science and biology. Read More

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http://dx.doi.org/10.1002/adma.202001582DOI Listing

Robust Interface Ru Centers for High-Performance Acidic Oxygen Evolution.

Adv Mater 2020 May 17:e1908126. Epub 2020 May 17.

Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.

RuO is considered as the state-of-the-art electrocatalyst for the oxygen evolution reaction (OER) in acidic media. However, its practical application is largely hindered by both the high reaction overpotential and severe electrochemical corrosion of the active centers. To overcome these limitations, innovative design strategies are necessary, which remains a great challenge. Read More

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http://dx.doi.org/10.1002/adma.201908126DOI Listing

The Electron-Phonon Interaction of Low-Dimensional and Multi-Dimensional Materials from He Atom Scattering.

Adv Mater 2020 May 15:e2002072. Epub 2020 May 15.

Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal, 4, Donostia-San Sebastian, 20018, Spain.

Atom scattering is becoming recognized as a sensitive probe of the electron-phonon interaction parameter λ at metal and metal-overlayer surfaces. Here, the theory is developed, linking λ to the thermal attenuation of atom scattering spectra (in particular, the Debye-Waller factor), to conducting materials of different dimensions, from quasi-1D systems such as W(110):H(1 × 1) and Bi(114), to quasi-2D layered chalcogenides, and high-dimensional surfaces such as quasicrystalline 2ML-Ba(0001)/Cu(001) and d-AlNiCo(00001). Values of λ obtained using He atoms compare favorably with known values for the bulk materials. Read More

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http://dx.doi.org/10.1002/adma.202002072DOI Listing

Direct Pyrolysis of Supermolecules: An Ultrahigh Edge-Nitrogen Doping Strategy of Carbon Anodes for Potassium-Ion Batteries.

Adv Mater 2020 May 14:e2000732. Epub 2020 May 14.

Materials Science and Engineering, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.

Most reported carbonaceous anodes of potassium-ion batteries (PIBs) have limited capacities. One approach to improve the performance of carbon anodes is edge-nitrogen doping, which effectively enhances the K-ion adsorption energy. It remains challenging to achieve high edge-nitrogen doping due to the difficulty in controlling the nitrogen dopant configuration. Read More

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http://dx.doi.org/10.1002/adma.202000732DOI Listing

Contributions of Different Functional Groups to Contact Electrification of Polymers.

Adv Mater 2020 May 14:e2001307. Epub 2020 May 14.

CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, P. R. China.

Polymers are commonly used to fabricate triboelectric nanogenerators (TENGs). Here, several polymer films with similar main chains but different functional groups on the side chain are employed to clarify the contributions of each functional group to contact electrification (CE). The results show that the electron-withdrawing (EW) ability and density of these functional groups on the main chain can determine both the polarity and density of CE-induced surface charges. Read More

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http://dx.doi.org/10.1002/adma.202001307DOI Listing
May 2020
17.493 Impact Factor

Weighted Mobility.

Adv Mater 2020 May 14:e2001537. Epub 2020 May 14.

QuesTek Innovations LLC, Evanston, IL, 60201, USA.

Engineering semiconductor devices requires an understanding of charge carrier mobility. Typically, mobilities are estimated using Hall effect and electrical resistivity meausrements, which are are routinely performed at room temperature and below, in materials with mobilities greater than 1 cm V s . With the availability of combined Seebeck coefficient and electrical resistivity measurement systems, it is now easy to measure the weighted mobility (electron mobility weighted by the density of electronic states). Read More

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http://dx.doi.org/10.1002/adma.202001537DOI Listing

Hydrogen-Substituted Graphdiyne Ion Tunnels Directing Concentration Redistribution for Commercial-Grade Dendrite-Free Zinc Anodes.

Adv Mater 2020 May 14:e2001755. Epub 2020 May 14.

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China.

Current aqueous Zn batteries (ZBs) seriously suffer from dendrite issues caused by rough electrode surfaces. Despite significant efforts in prolonging lifespan of these batteries, little effort has been devoted to dendrite elimination in commercial-grade cathode loading mass. Instead, demonstrations have only been done at the laboratory level (≤2 mg cm ). Read More

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http://dx.doi.org/10.1002/adma.202001755DOI Listing
May 2020
17.493 Impact Factor

Ultrabroadband Photodetectors up to 10.6 µm Based on 2D Fe O Nanosheets.

Adv Mater 2020 May 13:e2002237. Epub 2020 May 13.

State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China.

The ultrabroadband spectrum detection from ultraviolet (UV) to long-wavelength infrared (LWIR) is promising for diversified optoelectronic applications of imaging, sensing, and communication. However, the current LWIR-detecting devices suffer from low photoresponsivity, high cost, and cryogenic environment. Herein, a high-performance ultrabroadband photodetector is demonstrated with detecting range from UV to LWIR based on air-stable nonlayered ultrathin Fe O nanosheets synthesized via a space-confined chemical vapor deposition (CVD) method. Read More

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http://dx.doi.org/10.1002/adma.202002237DOI Listing

Thermal Management Enables Bright and Stable Perovskite Light-Emitting Diodes.

Adv Mater 2020 May 14:e2000752. Epub 2020 May 14.

Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA.

The performance of lead-halide perovskite light-emitting diodes (LEDs) has increased rapidly in recent years. However, most reports feature devices operated at relatively small current densities (<500 mA cm ) with moderate radiance (<400 W sr m ). Here, Joule heating and inefficient thermal dissipation are shown to be major obstacles toward high radiance and long lifetime. Read More

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http://dx.doi.org/10.1002/adma.202000752DOI Listing