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| Open AccessFrequency-division multiplexer and demultiplexer for terahertz wireless links
There is growing interest in the development of components to facilitate wireless communications in the terahertz but the characterization of these systems involve an unmodulated input. Here the authors demonstrate multiplexing and demultiplexing of data streams in the terahertz range using a real data link.
- Jianjun Ma
- , Nicholas J. Karl
- & Daniel M. Mittleman
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Article
| Open AccessOrganic flash memory on various flexible substrates for foldable and disposable electronics
Flexible flash memory is crucial to modern electronics, but its fabrication is challenging in the absence of suitable dielectric materials. Here, Lee et al. realize organic memory with retention over 10 years using tunneling and blocking dielectric layers prepared by initiated chemical vapor deposition.
- Seungwon Lee
- , Hyejeong Seong
- & Seunghyup Yoo
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Article
| Open AccessUnderstanding activity trends in electrochemical water oxidation to form hydrogen peroxide
Producing hydrogen peroxide via electrochemical oxidation of water is an attractive route to this valuable product. Here the authors theoretically and experimentally investigate hydrogen peroxide production activity trends for a range of metal oxides and identify the optimal bias ranges for high Faraday efficiencies.
- Xinjian Shi
- , Samira Siahrostami
- & Jens K. Nørskov
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Article
| Open AccessTargeted gadofullerene for sensitive magnetic resonance imaging and risk-stratification of breast cancer
Molecular MRI is a powerful clinical tool for non-invasive detection of cancer biomarkers. Here, the authors develop a targeted peptide gadofullerene contrast agent that can sensitively distinguish between breast cancers of different aggressiveness.
- Zheng Han
- , Xiaohui Wu
- & Zheng-Rong Lu
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Article
| Open AccessPhysical origins of current and temperature controlled negative differential resistances in NbO2
The development of future computation devices will be aided by a better understanding of the physics underlying material behaviors. Using thermoreflectance and spatially resolved X-ray microscopy, Kumar et al. elucidate the origin of two types of negative differential resistance in NbO2 memristors.
- Suhas Kumar
- , Ziwen Wang
- & R. Stanley Williams
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Article
| Open AccessHeterogeneous multi-compartmental hydrogel particles as synthetic cells for incompatible tandem reactions
Cells contain isolated compartments where cascade enzymatic biochemical reactions occur to form essential biological products with high efficiency. Here the authors produce functional hydrogel particles with multiple compartments via microfluidics that contain spatially immobilized natural enzymes in distinct domains for one-pot, tandem reactions.
- Hongliang Tan
- , Song Guo
- & Chia-Hung Chen
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Article
| Open AccessSoft material for soft actuators
The development of self-contained electrically driven soft actuators with high strain density is difficult. Here the authors show a single self-contained soft robust composite material that combines the elastic properties of a polymeric matrix and the extreme volume change accompanying liquid vapour transition.
- Aslan Miriyev
- , Kenneth Stack
- & Hod Lipson
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Article
| Open AccessMergeable nervous systems for robots
Robots that can self-assemble into different morphologies are desired to perform tasks that require different physical capabilities. Mathews et al. design robots whose bodies and control systems can merge and split to form new robots that retain full sensorimotor control and act as a single entity.
- Nithin Mathews
- , Anders Lyhne Christensen
- & Marco Dorigo
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Article
| Open Access3D calcite heterostructures for dynamic and deformable mineralized matrices
Minerals are rarely explored as building blocks for dynamic inorganic materials. Here, the authors derive inspiration from fish scales to create mutable surfaces based on arrays of calcite crystals, in which one end of each crystal is immobilized in and regenerated from silicone, and the other functional end is left exposed.
- Jaeseok Yi
- , Yucai Wang
- & Bozhi Tian
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Article
| Open AccessIn vivo quantitative imaging of tumor pH by nanosonophore assisted multispectral photoacoustic imaging
Background optical absorption of several biomolecules impedes an effective in vivo pH imaging in tumors. Here, the authors developed a visible light-based in vivo pH mapping method by coupling photoacoustic imaging and pH-responsive modified nanoparticles that selectively target tumor cells.
- Janggun Jo
- , Chang H. Lee
- & Xueding Wang
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Article
| Open AccessReactivation of dead sulfide species in lithium polysulfide flow battery for grid scale energy storage
Lithium polysulfide batteries suffer from the precipitation of insoluble and irreversible sulfide species on the surface of carbon and lithium. Here the authors show a reactivation strategy by a reaction with cheap sulfur powder under stirring and heating to recover the cell capacity.
- Yang Jin
- , Guangmin Zhou
- & Yi Cui
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Article
| Open AccessUltrathin metal–organic framework membrane production by gel–vapour deposition
MOF-based membranes have shown great promise in separation applications, but producing thin membranes that allow for high fluxes remains challenging. Here, the authors use a gel–vapour deposition strategy to fabricate composite membranes with less than 20 nm thicknesses and high gas permeances and selectivities.
- Wanbin Li
- , Pengcheng Su
- & Eddy Zeng
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Article
| Open AccessConformal metasurface-coated dielectric waveguides for highly confined broadband optical activity with simultaneous low-visibility and reduced crosstalk
Controlling all the optical properties of dielectric waveguides is a challenging task and often requires complicated core- and cladding designs. Here, Jiang et al. demonstrate that a thin metasurface coating can control several optical properties simultaneously over a broad frequency range.
- Zhi Hao Jiang
- , Lei Kang
- & Douglas H. Werner
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Article
| Open AccessUltra-large single crystals by abnormal grain growth
Growing large single crystals cheaply and reliably for structural applications remains challenging. Here, the authors combine accelerated abnormal grain growth and cyclic heat treatments to grow a superelastic shape memory alloy single crystal to 70 cm.
- Tomoe Kusama
- , Toshihiro Omori
- & Ryosuke Kainuma
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Article
| Open AccessAcoustically actuated ultra-compact NEMS magnetoelectric antennas
The miniaturization of antennas beyond a wavelength is limited by designs which rely on electromagnetic resonances. Here, Nan et al. have developed acoustically actuated antennas that couple the acoustic resonance of the antenna with the electromagnetic wave, reducing the antenna footprint by up to 100.
- Tianxiang Nan
- , Hwaider Lin
- & Nian Xiang Sun
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Correspondence
| Open AccessCorrespondence: The experimental requirements for a photon thermal diode
- Bair V. Budaev
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Correspondence
| Open AccessCorrespondence: Reply to ‘The experimental requirements for a photon thermal diode’
- Zhen Chen
- , Carlaton Wong
- & Chris Dames
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Article
| Open AccessElectromagnetic reprogrammable coding-metasurface holograms
Realizing metasurfaces with reconfigurability, high efficiency, and control over phase and amplitude is a challenge. Here, Li et al. introduce a reprogrammable hologram based on a 1-bit coding metasurface, where the state of each unit cell of the coding metasurface can be switched electrically.
- Lianlin Li
- , Tie Jun Cui
- & Shuang Zhang
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Article
| Open AccessInverted battery design as ion generator for interfacing with biosystems
At the molecular level, biological activities involve the transport of ions in a system. Here the authors demonstrate an ‘electron battery’ by inverting the configuration of a traditional Li-ion battery to generate an ionic current to interact with a biosystem for potential biomedical applications.
- Chengwei Wang
- , Kun (Kelvin) Fu
- & Liangbing Hu
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Article
| Open AccessPhysical limits to biomechanical sensing in disordered fibre networks
Cells in the connective tissue are surrounded by a heterogeneous network of biopolymers. Here, the authors investigate how such heterogeneity affects cellular mechanosensing by simulating the deformation response of experimental and modelled biopolymer networks to locally applied forces.
- Farzan Beroz
- , Louise M. Jawerth
- & Ned S. Wingreen
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Article
| Open AccessDynamic-template-directed multiscale assembly for large-area coating of highly-aligned conjugated polymer thin films
Controlling macromolecular assembly across length scales during solution coating of semiconducting polymers is still a challenge. Here the authors show a biomineralization inspired dynamic templating method that expedites polymer nucleation and assembly which allows for surface reconfiguration.
- Erfan Mohammadi
- , Chuankai Zhao
- & Ying Diao
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Article
| Open AccessUnderstanding extreme sea levels for broad-scale coastal impact and adaptation analysis
Uncertainties in contemporary extreme sea levels (ESL) from mean sea level rise (SLR) projections have been overlooked in broad-scale risk and adaptation studies. Here, the authors quantify the uncertainties in present-day global ESL estimates and find that they exceed those from global SLR projections.
- T. Wahl
- , I. D. Haigh
- & A. B. A. Slangen
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Article
| Open AccessRewritable ghost floating gates by tunnelling triboelectrification for two-dimensional electronics
Once fabricated, the gates of conventional electronic devices are spatially fixed. Here, the authors introduce tunnelling triboelectrification to create, modify and destroy on-demand ghost floating gates underneath 2D materials, with the spatial resolution of an atomic force microscope.
- Seongsu Kim
- , Tae Yun Kim
- & Christian Falconi
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Article
| Open AccessExperimental evidence of Willis coupling in a one-dimensional effective material element
Metamaterials enable the realization of unique material properties such as coupling between strain and momentum in a fluid—known as Willis coupling. Here, Muhlesteinet al. use homogenization theory to better understand Willis coupling in acoustic metamaterials and demonstrate the unusual material response.
- Michael B. Muhlestein
- , Caleb F. Sieck
- & Michael R. Haberman
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Article
| Open AccessDiffusion engineering of ions and charge carriers for stable efficient perovskite solar cells
Ion migration in perovskite solar cells are known to cause hysteresis and instability. Biet al., report a charge extraction layer based on graphene, fullerenes and carbon quantum dots which suppresses ion diffusion and enhances charge carrier diffusion leading to efficient devices with improved stability.
- Enbing Bi
- , Han Chen
- & Liyuan Han
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Article
| Open AccessHierarchical porous carbons with layer-by-layer motif architectures from confined soft-template self-assembly in layered materials
2D nanomaterials are promising capacitive energy storage materials, but their tendency to restack hinders electrolyte transport. Here, Yamauchi and colleagues introduce 2D ordered mesoporous carbons in between MXene layers, and metal removal affords all-carbon porous 2D–2D heterostructures in which restacking is prevented.
- Jie Wang
- , Jing Tang
- & Yusuke Yamauchi
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Article
| Open AccessQuantum tunnelling and charge accumulation in organic ferroelectric memory diodes
Organic non-volatile memories based on ferroelectric and semiconductor polymers are one of promising candidates for flexible electronics, yet the relevant device physics remains elusive. Ghittorelliet al. show that quantum tunnelling and charge accumulation govern the ferroelectric memory operation.
- Matteo Ghittorelli
- , Thomas Lenz
- & Fabrizio Torricelli
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Article
| Open AccessTemperature-regulated guest admission and release in microporous materials
Regulating guest access and release in porous materials remains an important goal. Here, May and colleagues elucidate the mechanism by which guest admission can be temperature-regulated in typical microporous materials, and experimentally exploit this process to achieve appreciable and reversible hydrogen storage.
- Gang (Kevin) Li
- , Jin Shang
- & Eric F. May
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Article
| Open AccessPreventing tissue fibrosis by local biomaterials interfacing of specific cryptic extracellular matrix information
Matrix metalloproteinase enzymes are widely known to contribute to the breakdown of tissues. Here, the authors utilise a biomaterial substrate functionalised with a laminin fragment to modulate the expression of these enzymes, subsequently controlling the integrity of tissue.
- Christine-Maria Horejs
- , Jean-Philippe St-Pierre
- & Molly M. Stevens
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Article
| Open AccessMagnetic forces enable controlled drug delivery by disrupting endothelial cell-cell junctions
The transportation of large molecules through the vascular endothelium presents a major challenge forin vivodrug delivery. Here, the authors demonstrate the potential of using external magnetic fields and magnetic nanoparticles to enhance the local extravasation of circulating large molecules.
- Yongzhi Qiu
- , Sheng Tong
- & Gang Bao
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Article
| Open AccessCompaction of quasi-one-dimensional elastoplastic materials
Principles underlying crumpling of one-dimensional objects may be relevant to both biomolecular processes and to design of mechanical devices. By compacting various wires under rigid confinement and modelling observed geometric features, the authors show how friction, plasticity and torsion enhance disorder and lead to a transition from coiled to folded geometries.
- M. Reza Shaebani
- , Javad Najafi
- & Mehdi Habibi
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Article
| Open AccessThree-dimensional crossbar arrays of self-rectifying Si/SiO2/Si memristors
Memristors are key structural units of complex memory and computing systems, yet most currently available memristors are based on materials that are not compatible with silicon technology. Here, the authors demonstrate a CMOS-compatible, self-rectifying memristor and arrays entirely based on p-Si/SiO2/n-Si.
- Can Li
- , Lili Han
- & Qiangfei Xia
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Article
| Open AccessThermal annihilation of photo-induced radicals following dynamic nuclear polarization to produce transportable frozen hyperpolarized 13C-substrates
Hyperpolarized molecules provide unique contrast for MRI but due to their short relaxation time need to be prepared shortly before injection. Here the authors report a method for eliminating the main source of relaxation and producing frozen polarized substances that can be stored and transported.
- Andrea Capozzi
- , Tian Cheng
- & Arnaud Comment
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Article
| Open AccessHot excited state management for long-lived blue phosphorescent organic light-emitting diodes
Large-scale commercialization of organic light-emitting diodes is impeded by the short operational lifetime of blue emitting materials. Leeet al. show a strategy to manage the energy dissipation on molecular dissociation using dopants with high triplet exciton energy that improves device stability.
- Jaesang Lee
- , Changyeong Jeong
- & Stephen R. Forrest
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Article
| Open AccessNeuromorphic device architectures with global connectivity through electrolyte gating
Global regulation of synaptic strengths in neural systems is known as homeoplasticity. Here, Gkoupideniset al. use an electrolyte to connect and control an array of organic electrochemical devices, in order to demonstrate behaviour that resembles homeoplasticity phenomena in the brain.
- Paschalis Gkoupidenis
- , Dimitrios A. Koutsouras
- & George G. Malliaras
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Article
| Open AccessNanogenerator-based dual-functional and self-powered thin patch loudspeaker or microphone for flexible electronics
Self-powered nanogenerators by harvesting energy from the environment are desirable for future portable and wearable electronics. Liet al. show the use of ferroelectret nanogenerators to build microphone or loudspeaker, which convert electrical signals to mechanical motions in a reversible manner.
- Wei Li
- , David Torres
- & Nelson Sepúlveda
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| Open AccessFace classification using electronic synapses
Using chips that mimic the human brain to perform cognitive tasks, namely neuromorphic computing, calls for low power and high efficiency hardware. Here, Yaoet al. show on-chip analogue weight storage by integrating non-volatile resistive memory into a CMOS platform and test it in facial recognition.
- Peng Yao
- , Huaqiang Wu
- & He Qian
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Article
| Open AccessLipoprotein-biomimetic nanostructure enables efficient targeting delivery of siRNA to Ras-activated glioblastoma cells via macropinocytosis
Drug delivery in brain tumours is still a significant clinical concern. In this study, the authors develop a biomimetic lipoprotein nanoparticle for the efficient delivery of ATF5 siRNA inRas-activated brain cancer cells, where the nanoparticle is internalized by macropinocytosis in a Ras-dependent manner.
- Jia-Lin Huang
- , Gan Jiang
- & Xiao-Ling Gao
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Article
| Open AccessMembraneless water filtration using CO2
Water treatment processes mostly rely on the use of membranes and filters, which have high pumping costs and require periodic replacement. Here, the authors describe an efficient membraneless method that induces directed motion of suspended colloidal particles by exposing the suspension to CO2.
- Sangwoo Shin
- , Orest Shardt
- & Howard A. Stone
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Article
| Open AccessAn extra-uterine system to physiologically support the extreme premature lamb
The ability to support the development of a premature fetus in the form of an extracorporeal system has had limited success. Here, the authors show that an extra-uterine device that mimics the intra-uterine environment can provide physiologic support for the extreme premature lamb fetus for four weeks.
- Emily A. Partridge
- , Marcus G. Davey
- & Alan W. Flake
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Article
| Open AccessElectrochemical generation of sulfur vacancies in the basal plane of MoS2 for hydrogen evolution
In order to fully utilize sulfur vacancies in MoS2 catalysts for industrial applications, a facile and general route for making sulfur vacancies in MoS2 is needed. Here, the authors introduce a scalable route towards generating sulfur vacancies on the MoS2basal plane using electrochemical desulfurization.
- Charlie Tsai
- , Hong Li
- & Frank Abild-Pedersen
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Article
| Open AccessImplantable batteryless device for on-demand and pulsatile insulin administration
Implantable insulin delivery devices can make a significant difference in the lives of patients although they are limited by the duration of their battery life, often requiring replacement. Here, the authors developed an implantable battery-less insulin delivery device with noninvasive actuation.
- Seung Ho Lee
- , Young Bin Lee
- & Young Bin Choy
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Article
| Open AccessCharge carrier mobility in thin films of organic semiconductors by the gated van der Pauw method
Charge carrier mobility is one of the key parameters that are used to evaluate the electrical quality of thin film semiconductors, whilst it is easily overestimated. Here, Rolinet al. use the gated van der Pauw method to extract charge mobility independent of contact resistance and device dimensions.
- Cedric Rolin
- , Enpu Kang
- & Jan Genoe
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Article
| Open AccessMechano-regulated surface for manipulating liquid droplets
Droplet manipulation is an essential task for designing microfluidic platforms such as lab-on-chip devices. Here Tanget al. develop a non-wettable mesh with reversible liquid adhesion controlled by mechanically inserting wettable pillars which allows for effective and rapid droplet manoeuvring.
- Xin Tang
- , Pingan Zhu
- & Liqiu Wang
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Article
| Open AccessStable and solubilized active Au atom clusters for selective epoxidation of cis-cyclooctene with molecular oxygen
Gold catalysts have previously been reported for the epoxidation of alkenes with molecular oxygen. Here the authors show that, rather than the gold nanoparticles, the active species for this reaction are actually small, soluble gold species stabilized by the oxidised organic products.
- Linping Qian
- , Zhen Wang
- & Harold H. Kung
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Article
| Open AccessMolecular level detection and localization of mechanical damage in collagen enabled by collagen hybridizing peptides
Collagen denaturation is thought to occur during tissue mechanical damage, but its role in damage initiation is still unclear. Here, the authors use a collagen hybridizing peptide to provide insights into the molecular mechanisms leading to collagen unfolding during tendon mechanical stretch.
- Jared L. Zitnay
- , Yang Li
- & Jeffrey A. Weiss
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Article
| Open AccessThe best features of diamond nanothread for nanofibre applications
Carbon fibres are emerging as a promising material for multifunctional nanotextiles. Here, the authors show that diamond nanothread possesses excellent torsional deformation capability and interfacial load transfer efficiency, ideal for constructing next generation carbon fibres.
- Haifei Zhan
- , Gang Zhang
- & Yuantong Gu
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Article
| Open AccessDemonstrating the potential of yttrium-doped barium zirconate electrolyte for high-performance fuel cells
Protonic ceramic fuel cells are promising for energy applications, but maintaining high performance with long-term stability is an issue. Here the authors use a stable yttrium-doped barium zirconate electrolyte, achieving a power output one order of magnitude higher than existing protonic ceramic fuel cells.
- Kiho Bae
- , Dong Young Jang
- & Joon Hyung Shim
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Article
| Open AccessLimited options for low-global-warming-potential refrigerants
With societies phasing down the use of hydrofluorocarbons (HFCs), alternative environmentally-friendly refrigerants are required. Here the authors screen a large chemical database for replacements, performing simulations to show there are only a few candidate single-component fluids that can realistically replace HFCs.
- Mark O. McLinden
- , J. Steven Brown
- & Piotr A. Domanski