• Issue
    Volume 29, Issue 28
    July 11, 2019

Cover Picture

Free Access

Ionotropic Gradients: Ionic Hydrogels with Biomimetic 4D-Printed Mechanical Gradients: Models for Soft-Bodied Aquatic Organisms (Adv. Funct. Mater. 28/2019)

  • First Published: 09 July 2019
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In article number 1806723, Ralph G. Nuzzo and co-workers use direct ink writing to prepare soft sea jelly-mimetic aquatic actuators made from hydrogel materials that integrate structure, composition, and ion-based gradients to allow mimicry of the dynamic and flexural features of cnidarian organisms. Image courtesy of Joselle M. McCracken.

Inside Front Cover

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Flexible Electronics: A Versatile Approach for Direct Patterning of Liquid Metal Using Magnetic Field (Adv. Funct. Mater. 28/2019)

  • First Published: 09 July 2019
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In article number 1901370, Chao Zhao, Hong Liu, and co-workers report a simple and versatile approach for the direct patterning of liquid metal on various planar and nonplanar substrates. This is achieved by applying a moving magnetic field to the liquid metal dispersed with magnetic microparticles. This approach is also applicable to supermetallophobic substrates and curved surfaces even in narrow and nearly closed spaces.

Inside Back Cover

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Anomalous Photovoltaic Effects: Ferroelectric, Photoelectric, and Photovoltaic Performance of Silver Niobate Ceramics (Adv. Funct. Mater. 28/2019)

  • First Published: 09 July 2019
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In article number 1900918, Zhiguo Yi and co-workers report on the photoelectric and photovoltaic properties of AgNbO3 ceramics. The ceramic exhibits a bandgap of ≈2.75 eV with a long tail absorption until 800 nm, leading to a significant photoelectric response in the visible-light range. In addition, an intriguing photovoltaic effect is introduced to AgNbO3 ceramics either by electric poling or mechanical polishing.

Back Cover

Free Access

Solid-State Lithium Batteries: Intercalated Electrolyte with High Transference Number for Dendrite-Free Solid-State Lithium Batteries (Adv. Funct. Mater. 28/2019)

  • First Published: 09 July 2019
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In article number 1901047, Li-Zhen Fan, Qiang Zhang, and co-workers describe an intercalated composite solid electrolyte that presents high ionic conductivity and ionic transference number. The synergistic effect of high transference number intercalated electrolytes and 3D lithium anode effectively suppresses lithium dendrites. The assembled batteries deliver a high cycling performance, demonstrating a promising strategy for ambient-temperature solid-state lithium metal batteries.

Masthead

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Masthead: (Adv. Funct. Mater. 28/2019)

  • First Published: 09 July 2019

Contents

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Contents: (Adv. Funct. Mater. 28/2019)

  • First Published: 09 July 2019

Reviews

Complex Band Structures and Lattice Dynamics of Bi2Te3-Based Compounds and Solid Solutions

  • First Published: 26 April 2019
Description unavailable

The key factors in the first-principles calculations for (Bi1–xSbx)2(Te1–ySey)3 are reviewed. Local-density approximation is more accurate in the band structure calculations of relaxed Te-based compounds due to the reasonable treatment in van der Waals force. The modified Becke–Johnson correction is needed for Bi2Se3.The low lattice thermal conductivities of Bi2Te3-based compounds are related to the low group velocity and lifetime.

Nanomaterials in Superlubricity

  • First Published: 30 April 2019
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Superlubricity is a state of ultralow friction and has attracted increasing interest in numerous potential applications of nanomaterials. A timely review offers possible solutions to lubrication challenges in a variety of nanotechnologies including water transport control, micro/nano-electromechanical systems, biomedical engineering, atomic force microscopy, and other electronic devices for which maintaining their functional stability is pivotal.

Full Papers

Ionic Hydrogels with Biomimetic 4D-Printed Mechanical Gradients: Models for Soft-Bodied Aquatic Organisms

  • First Published: 16 April 2019
Description unavailable

Patterning gradients is foundational for the development of 4D-printed structures. A novel, simple materials assembly paradigm for direct-ink writing is presented to translate design complexity to net form fabrication via embedding gray scale gradients of complex form.

A Versatile Approach for Direct Patterning of Liquid Metal Using Magnetic Field

  • First Published: 28 March 2019
Description unavailable

A novel liquid metal patterning approach is presented using a magnetic field. This is achieved by applying a moving magnetic field to a liquid metal droplet dispersed with magnetic microparticles. This approach is compatible with different substrates including supermetallophobic and curved surfaces. A few applications of the versatile patterning approach for flexible electronics and wearable sensors are also demonstrated.

Ferroelectric, Photoelectric, and Photovoltaic Performance of Silver Niobate Ceramics

  • First Published: 05 April 2019
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The photoelectric and photovoltaic performances of AgNbO3 ceramics are comprehensively studied in this article. The spark plasma sintered AgNbO3 ceramic exhibits a bandgap ≈2.75 eV with a long tail absorption until 800 nm, leading to a significant photoelectric response in the visible-light range. In addition, an intriguing photovoltaic effect is introduced to AgNbO3 ceramics by either electric poling or mechanical polishing.

Intercalated Electrolyte with High Transference Number for Dendrite-Free Solid-State Lithium Batteries

  • First Published: 05 April 2019
Description unavailable

The intercalated composite solid electrolyte presents a large ionic conductivity and high ionic transference number. The synergistic effect of the high transference number intercalated electrolytes and 3D lithium anode effectively suppresses lithium dendrites. The assembled batteries deliver a high cycling performance, demonstrating a promising strategy for ambient-temperature solid-state lithium metal batteries.

Frontispiece

Free Access

Heat Sensing: Thermodiffusion-Assisted Pyroelectrics—Enabling Rapid and Stable Heat and Radiation Sensing (Adv. Funct. Mater. 28/2019)

  • First Published: 09 July 2019
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In article number 1900572, Dan Zhao, Magnus P. Jonsson, and co-workers present a new sensor capable of detecting heat, light, and warm touch. The presented concept of (plasmon-driven) thermodiffusion-assisted pyroelectrics combines and enhances the performance of pyroelectric and ionic thermoelectric materials. The concept provides both rapid and stable sensor signals and could be useful in applications such as electronic skin.

Full Papers

Thermodiffusion-Assisted Pyroelectrics—Enabling Rapid and Stable Heat and Radiation Sensing

  • First Published: 15 April 2019
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Layering pyroelectric and ionic thermoelectric materials can provide combined and synergistically enhanced signals upon heat stimuli, as reported in this article. The presented integrated devices generate both rapid voltage signals directly upon heat stimuli and enhanced saturated signals at equilibrium. Likewise, incorporation of plasmonic metasurfaces enables the concept to provide fast and stable signals upon radiation stimuli.

Viromimetic STING Agonist-Loaded Hollow Polymeric Nanoparticles for Safe and Effective Vaccination against Middle East Respiratory Syndrome Coronavirus

  • First Published: 12 April 2019
Description unavailable

To improve vaccination efforts against Middle East respiratory syndrome coronavirus (MERS-CoV), a virus-mimicking vaccine is herein prepared with a capsid-like hollow polymeric nanoparticle loaded with STING agonists and coated in MERS-CoV antigens. The viromimetic nanoparticle facilitates safe and effective vaccination against the lethal virus and offers a versatile platform for combatting emerging infectious threats.

Treefrog Toe Pad-Inspired Micropatterning for High-Power Triboelectric Nanogenerator

  • First Published: 08 May 2019
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Treefrog toe pad-inspired micropattern arrarys of the tribo-dielectric surface for the high-power triboelectric nanogenerator(TENG) demonstrates an output voltage of 490 V and current density of 24.4 µA cm−2, with an instantaneous power density of 23.9 Wm−2 under a compressive force of 38 N. This study also guides a rational design for the patterned surfaces in order to produce a high-performance reliable TENG.

Defect Engineering in Two Common Types of Dielectric Materials for Electromagnetic Absorption Applications

  • First Published: 08 May 2019
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A point defect strategy is introduced to investigate the underlying relations between the polarization/conduction loss and the complex permittivity. Dielectric polarization and conduction loss are found to play dominant roles in determining the complex permittivity of oxide semiconductors and graphitized carbon, respectively.

Compositional and Dimensional Control of 2D and Quasi-2D Lead Halide Perovskites in Water

  • First Published: 08 May 2019
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Aqueous syntheses, characterizations and optical properties of 16 organic–inorganic hybrid compounds including 2D (A′)2PbX4 (A′ = butylammonium, X = Cl/Br/I) (8), 3D perovskites (4), and quasi-2D (A′)pAx −1BxX3x+1 LHPs (A = methylammonium) (4) are reported. For the first time, composition and dimension of hybrid compounds have been tuned in water by changing the size of the organic cation.

Temperature- and Light-Regulated Gas Transport in a Liquid Crystal Polymer Network

  • First Published: 08 May 2019
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Stimuli-responsive membranes based on liquid crystal polymers are prepared for the temperature and photoinduced reversible regulation of their gas permeation. The smart membrane shows a strong correlation between the membrane structure and their permeation performance. Changes in the order parameter of the polymer network are considered to be the main cause for the permeation alteration.

Biomimetic Materials with Multiple Protective Functionalities

  • First Published: 10 May 2019
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A versatile dimethylglyoxime–urethane moiety (DOU) is proposed to construct multifunctional protective materials. The reversible dissociation, metal coordination, and photolysis of the DOU enable dynamic bonds, dual-hard phases, mechanical gradients, and spatially controlled functionalization. Accordingly, a multifunctional super protective film combining rapid room-temperature self-healing, mechanical robustness, and anti-counterfeiting property is readily produced. It is expected to be very useful for protecting various valuable objects.

Nanoscale Parallel Circuitry Based on Interpenetrating Conductive Assembly for Flexible and High-Power Zinc Ion Battery

  • First Published: 08 May 2019
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The reported nanoscale parallel circuitry is based on an interpenetrating conductive assembly through intertwining carbon nanotubes with manganese decorated multilayered MXene, which achieves an ultrahigh rate capability by providing rapid pathways for ions and electrons, as well as dividing the current flow evenly into the assembly. The assembled zinc ion batteries exhibit outstanding flexibility, mechanical robustness and power delivering performance.

Combining Data Longevity with High Storage Capacity—Layer-by-Layer DNA Encapsulated in Magnetic Nanoparticles

  • First Published: 10 May 2019
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Stable DNA storage on magnetic nanoparticles is demonstrated. Stacking DNA using layer-by-layer loading enables a significant increase in DNA loading. Stable storage is achieved by hermetically sealing the DNA using silica grown via sol-gel chemistry. Quality control is performed by exposing nanoparticles to increased temperature and humidity. A digital file encoded in DNA can be successfully retrieved after heat treatment.

Fiber Reinforced Layered Dielectric Nanocomposite

  • First Published: 08 May 2019
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A thermally conductive dielectric nanocomposite with mechanical flexibility and robustness and temperature stability is developed by integrating 1D polyaramid nanofibers and 2D boron nitride nanosheets for next-generation electronic device and electric power systems.

High Responsivity and Response Speed Single-Layer Mixed-Cation Lead Mixed-Halide Perovskite Photodetectors Based on Nanogap Electrodes Manufactured on Large-Area Rigid and Flexible Substrates

  • First Published: 08 May 2019
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Flexible coplanar metal–perovskite–metal photodetectors are fabricated using nanogap-separated asymmetric electrodes patterned with adhesion lithography. The ultrashort (≈10 nm) interelectrode distance and the carefully engineered perovskite film result in devices exhibiting high responsivity (33 A W−1) and fast response times of 260 ns.

Deterministic Switching of Ferroelectric Bubble Nanodomains

  • First Published: 10 May 2019
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The deterministic and reversible transformation between nanoscale ferroelectric bubble domains and cylindrical ones is demonstrated using scanning probe microscopy (SPM). The bubble domains, with rotational polarization, can be erased by mechanical force via the SPM tip, and application of an electrical pulse with a specific combination of amplitude and duration can recreate either the bubble or cylindrical domains.

Ordered Mesoporous Metastable α-MoC1−x with Enhanced Water Dissociation Capability for Boosting Alkaline Hydrogen Evolution Activity

  • First Published: 10 May 2019
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An ordered mesoporous material constructed with a metastable, face-centered-cubic α-MoC1−x phase is presented as a catalyst promoter and support for metal catalysts to boost sluggish alkaline HER activities. Density functional theory calculations and experimental studies reveal that the enhanced activity originates from excellent water dissociation capability, facile proton adsorption, and efficient mass transport.

Photoelectric Synaptic Plasticity Realized by 2D Perovskite

  • First Published: 08 May 2019
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Light stimulated synaptic devices based on 2D perovskite (PEA)2SnI4 exhibit excellent photoelectric synaptic plasticity including the frequency-dependent transmission from STP to LTP, PPF, and dynamical response to light stimuli. The photoelectrical performance of (PEA)2SnI4 can be easily modulated by chemical composition engineering and the physical mechanism behind the photomemory effect can be attributed to the Sn vacancy-dominant trapping mechanisms.

Multipoint Defect Synergy Realizing the Excellent Thermoelectric Performance of n-Type Polycrystalline SnSe via Re Doping

  • First Published: 08 May 2019
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In this work, point defect engineering is employed for changing the carrier species, enhancing the electrical transport properties, and reducing the thermal conductivity of the SnSe polycrystal. An n-type Sn0.97Re0.03Se0.93Cl0.02 bulk sample achieves a peak ZT of 1.5 at 798 K, the highest value recorded for an n-type SnSe polycrystalline sample.

A New Strategy to Build a High-Performance P′2-Type Cathode Material through Titanium Doping for Sodium-Ion Batteries

  • First Published: 08 May 2019
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The substitution of Mn with Fe3+ and Ti4+ in P′2-type Na0.67[(Mn0.78Fe0.22)0.9Ti0.1]O2 leads to the suppression of phase transitions with an increased average Mn oxidation state. Therefore, it delivers high reversible capacity during cycling with a small volume change. Above all, it shows excellent high rate capability, accompanied by low activation barrier energy of ≈541 meV for Na+ diffusion.

Ice-Assisted Synthesis of Black Phosphorus Nanosheets as a Metal-Free Photocatalyst: 2D/2D Heterostructure for Broadband H2 Evolution

  • First Published: 09 May 2019
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A green and facile strategy is developed to generate few-layer black phosphorus (BP): ice-assisted exfoliation from bulk BP. A metal-free photocatalyst is synthesized by combining BP and g-C3N4, which protects BP from oxidation and leads to efficient and broadband activity as well as long-term stability in H2 evolution. Benefiting from formed NP bonds, the efficient charge transfer between them yields excellent photocatalytic performance.

Enhanced Microwave Absorption Performance from Magnetic Coupling of Magnetic Nanoparticles Suspended within Hierarchically Tubular Composite

  • First Published: 06 May 2019
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This hierarchically tubular composite is rationally designed with a sustainable kapok template. Benefiting from the submillimeter-scale magnetic coupling network and hierarchical conductive path, the hierarchical composite demonstrates a first-rate microwave absorption performance.

Sustainable Separators for High-Performance Lithium Ion Batteries Enabled by Chemical Modifications

  • First Published: 23 May 2019
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A dense chitin nanofiber-based separator with a high lithium ion transference number is achieved by a facile surface chemical modification method. This is a new type of separator that falls in between a traditional separator and gel electrolyte, and thus shows good comprehensive performance when compared with the liquid electrolyte-based polyolefin separator and gel electrolyte.

Periodic Arrays of Diamond-Shaped Silver Nanoparticles: From Scalable Fabrication by Template-Assisted Solid-State Dewetting to Tunable Optical Properties

  • First Published: 22 May 2019
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Ag nanoparticle arrays obtained by solid-state dewetting are investigated. Their optical response is strongly impacted by not only surface lattice resonances, but also the dewetting quality and the individual shape of particles. Three main process parameters modifying the two latter are identified: grain size in the film prior to dewetting, film volume by unit cell, and interface energies.

Zirconyl Hydrogenphosphate Nanocontainers for Flexible Transport and Release of Lipophilic Cytostatics, Insecticides, and Antibiotics

  • First Published: 22 May 2019
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LC@ZrO(mdp)@ZrO(HPO4) core@shell nanocontainers (LC: lipophilic cavity) are suggested as a novel nanocarrier concept for lipophilic molecules. Feasibility and adaptability are exemplarily presented for the fluorescent dye lumogen red, the cytostatic drug irinotecan, the insecticide cypermethrin, and the tuberculosis antibiotic benzothiazinone-043.