14,277 results match your criteria ACS nano[Journal]


Intrinsic Ion Transport Properties of Block Copolymer Electrolytes.

ACS Nano 2020 Jun 4. Epub 2020 Jun 4.

Knowledge of intrinsic properties is of central importance for materials design and assessing suitability for specific applications. Self-assembling block copolymer electrolytes (BCEs) are of great interest for applications in solid-state energy storage devices. Fundamental understanding of ion transport properties, however, is hindered by the difficulty in deconvoluting extrinsic factors, such as defects, from intrinsic factors, such as the presence of interfaces between the domains. Read More

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http://dx.doi.org/10.1021/acsnano.0c03713DOI Listing

Flat Bands and Mechanical Deformation Effects in the Moiré Superlattice of MoS-WSe Heterobilayers.

ACS Nano 2020 Jun 4. Epub 2020 Jun 4.

It has recently been shown that quantum-confined states can appear in epitaxially grown van der Waals material heterobilayers without a rotational misalignment (θ=0°), associated with flat bands in the Brillouin zone of the moiré pattern formed due to the lattice mismatch of the two layers. Peaks in the local density of states and confinement in a MoS/WSe system was qualitatively described only considering local stacking arrangements, which cause band edge energies to vary spatially. In this work, we report the presence of large in-plane strain variation across the moiré unit cell of a θ=0° MoS/WSe heterobilayer, and show that inclusion of strain variation and out-of-plane displacement in density functional theory calculations greatly improves their agreement with the experimental data. Read More

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http://dx.doi.org/10.1021/acsnano.0c03414DOI Listing

In-Plane Ferroelectric Tin Monosulfide and Its Application in Ferroelectric Analog Synaptic Device.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Two-dimensional ferroelectrics is attractive for synaptic device applications because of its low power consumption and amenability to high-density device integration. Here, we demonstrate that Tin monosulfide (SnS) films less than 6 nm thick shows optimum performance as semiconductor channel in in-plane ferroelectric analogue synaptic device, whereas thicker films have much poorer ferroelectric response due to screening effects by a higher concentration of charge carriers. The SnS ferroelectric device exhibits synaptic behaviors with highly stable room temperature operation, high linearity in potentiation/depression, long retention, and low cycle-to-cycle/device-to-device variations. Read More

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http://dx.doi.org/10.1021/acsnano.0c03869DOI Listing

Orbital Overlapping through Induction Bonding Overcomes the Intrinsic Delamination of 3D Printed Cementitious Binders.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

3D printing of cementitious materials holds a great promise for construction due to its rapid, consistent, modular, and geometry-controlled ability. However, its major drawback is low cohesion in the interlayer region. Herein, we report a combined experimental and computational approach to understand and control fabrication of 3D printed cementitious materials with significantly enhanced interlayer strength using multimaterial 3D printing, in which the composition, function and structure of the materials are programmed. Read More

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http://dx.doi.org/10.1021/acsnano.0c02038DOI Listing

Oxide Inhibitor-Assisted Growth of Single-Layer Molybdenum Dichalcogenides (MoX, X=S, Se, Te) with Controllable Molybdenum Release.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Though chemical vapor deposition (CVD) methods have been widely used in the growth of two-dimensional transitional metal dichalcogenides (2D TMDCs), the controllable fabrication of 2D TMDCs is yet hard to achieve because of the great challenge of concisely controlling the release of precursors vapor, one of the most critical growth kinetic factors. To solve this important issue, here we report the utilization of oxide inhibitors (OIs) covering Mo source during CVD reactions to manipulate the release of Mo vapor. In contrast to the lack of capability of conventional CVD methods, 2D molybdenum dichalcogenide (MoX, X=S, Se, Te) monolayers were successfully fabricated through the proposed new CVD protocol with the oxide-inhibitor assisted growth (OIAG) strategy. Read More

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http://dx.doi.org/10.1021/acsnano.0c03469DOI Listing

Remote Lightening and Ultrafast Transition: Intrinsic Modulation of Exciton Spatio-Temporal Dynamics in Monolayer MoS.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Devices operating with excitons have promising prospect for overcoming the dilemma of response time and integration in current generation of electron or/and photon based elements and devices. Although the intrinsic properties including edges, grain boundaries and defects of atomically thin semiconductors have been demonstrated as a powerful tool to adjust bandgap and exciton energy, investigating the intrinsic modulation of spatio-temporal dynamics still remains challenging on account of the short exciton diffusion length. Here, we achieve the attractive remote lightening that the emission region could be far away (up to 14. Read More

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http://dx.doi.org/10.1021/acsnano.0c01165DOI Listing

Urease-Powered Polydopamine Nanomotors for Intravesical Therapy of Bladder Diseases.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

The intravesical therapeutic delivery has been extensively investigated for various bladder diseases such as bladder cancer, overactive bladder, urinary incontinence, and interstitial cystitis. However, conventional drug carriers have a low therapeutic delivery efficiency because of the passive diffusion of drug molecules in bladder and the rapid clearance by the periodic urination. Here, we report biocompatible and bioavailable enzyme-powered polymer nanomotors which can deeply penetrate into a mucosa layer of bladder wall and remain for a long-term period in the bladder. Read More

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http://dx.doi.org/10.1021/acsnano.9b09726DOI Listing

Dual-Regulation Strategy to Improve Anchoring and Conversion of Polysulfides in Lithium-Sulfur Batteries.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

The sluggish reaction kinetics at the cathode/electrolyte interface of lithium-sulfur (Li-S) batteries limits their commercialization. Herein, we show that a dual-regulation system of iron phthalocyanine (FePc) and octafluoronaphthalene (OFN) decorated on graphene (Gh), denoted as Gh/FePc+OFN, accelerates the interfacial reaction kinetics of lithium polysulfides (LiPSs). Multiple in-situ spectroscopy techniques, ex-situ X-ray photoelectron spectroscopy combined with density functional theory calculations demonstrate that FePc acts as an efficient anchor and scissor for the LiPSs through Fe∙∙∙S coordination, mainly facilitating their liquid-liquid transformation, whereas OFN enables Li-bond interaction with the LiPSs, accelerating the kinetics of the liquid-solid nucleation and growth of Li2S. Read More

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http://dx.doi.org/10.1021/acsnano.0c03403DOI Listing

Reconstructing Local Profile of Exciton-Emission Wavelengths across a WS2 Bubble beyond Diffraction Limit.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Air bubbles formed between layers of two-dimensional (2D) materials are not only unavoidable, but also emerge as an important means of engineering their excitonic emission properties, especially as controllable quantum light sources. Measuring the actual spatially-resolved optical properties across such bubbles is important for understanding excitonic physics and for device applications; But such measurement is challenging due to nanoscale features involved which require spatial resolution beyond diffraction limit. Additional complexity is the involvement of multiple physical effects such as mechanical strain and dielectric environment that are difficult to disentangle. Read More

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http://dx.doi.org/10.1021/acsnano.0c01337DOI Listing

Unraveling the Spatial Distribution of Catalytic Non-Cubic Au Phases in a Bipyramidal Microcrystallite by X-Ray Diffraction Microscopy.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Tuning of crystal-structures and shapes of sub-micron-sized noble metals have revealed fascinating catalytic, optical, electrical and magnetic properties that enable developments of environment-friendly and durable nano-technological applications. Several attempts have been made to stabilize Au, knowing its extraordinary stability in its conventional face-centered cubic (fcc) lattice, into different lattices particularly to develop Au-based catalysis for industry. Here, we report the results from scanning X-ray diffraction microscopy (SXDM) measurements on an ambient-stable penta-twinned bipyramidal Au microcrystallite (about 1. Read More

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http://dx.doi.org/10.1021/acsnano.0c02031DOI Listing

Solvent-Solvent Correlations across Graphene: The Effect of Image Charges.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Wetting experiments show pure graphene to be weakly hydrophilic, but its contact angle (CA) also reflects the character of the supporting material. Measurements and Molecular Dynamics simulations on suspended and supported graphene often reveal a CA reduction due to the presence of the supporting substrate. A similar reduction is consistently observed when graphene is wetted from both sides. Read More

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http://dx.doi.org/10.1021/acsnano.9b09321DOI Listing

Depletion of Lubricant from Nanostructured Oil-Infused Surfaces by Pendant Condensate Droplets.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Due to recent advances in nanofabrication, phase-change condensation heat transfer has seen a renaissance. Compared to conventional heat transfer surfaces, nanostructured surfaces impregnated with chemically matched lubrication film (hereinafter referred to as "nanostructured lubricated surfaces") have been demonstrated to improve the vapor-side phase-change condensation heat transfer by facilitating droplet nucleation, growth and departure. While the presence of nanoscale roughness improves performance longevity by stabilizing the lubrication film via capillary forces, such enhancement is short-lived due to the eventual loss of lubrication oil by departing droplets. Read More

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http://dx.doi.org/10.1021/acsnano.9b10184DOI Listing

Tailorable Electrocatalytic 5-Hydroxymethylfurfural Oxidation and H Production: Architecture-Performance Relationship in Bifunctional Multilayer Electrodes.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Water electrocatalytic splitting is considered as an ideal process for generating H2 without byproducts. However, in the water-splitting reaction, a high overpotential is needed to overcome the high energy barrier due to the slow kinetics of the oxygen evolution reaction (OER). In this study, we selected the 5-hydroxymethylfurfural (HMF) oxidation reaction, which is thermodynamically favored, to replace the OER in the water-splitting process. Read More

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http://dx.doi.org/10.1021/acsnano.0c00581DOI Listing

Ultralong Spin Lifetime in Light Alkali Atom Doped Graphene.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Today's great challenges of energy and informational technologies are addressed with a singular compound, the Li and Na doped few layer graphene. All what is impossible for graphite (homogeneous and high level Na doping), and unstable for single layer graphene, works very well for this structure. The transformation of the Raman G line to a Fano lineshape and the emergence of strong, metallic-like electron spin resonance (ESR) modes, attest the high level of graphene doping in liquid ammonia for both kinds of alkali atoms. Read More

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http://dx.doi.org/10.1021/acsnano.0c03191DOI Listing

Highly Flexible Monolayered Porous Membrane with Superhydrophilicity-Hydrophilicity for Unidirectional Liquid Penetration.

ACS Nano 2020 Jun 4. Epub 2020 Jun 4.

Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry, Beihang University, Beijing 100191, P.R. China.

The ability to allow microliquid to penetrate in one direction but block in the opposite direction plays an irreplaceable role in intelligent liquid management. Despite much progress toward facilitating directional transport by multilayer porous membranes with opposite wettability, it remains difficult to achieve a highly multifunctional flexible membrane for highly efficient unidirectional liquid transport in different situations. Herein, a superhydrophilic-hydrophilic self-supported monolayered porous poly(ether sulfone) (PES) membrane with special nano- and micropores at opposite surfaces is demonstrated, which can be used for unidirectional liquid transport. Read More

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http://dx.doi.org/10.1021/acsnano.0c02558DOI Listing

Programming Biomimetically Confined Aptamers with DNA Frameworks.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Active sites of proteins are generally encapsulated within three-dimensional peptide scaffolds that provide the molecular-scale confinement microenvironment. Nevertheless, the ability to tune thermodynamic stability in biomimetic molecular confinement relies on the macromolecular crowing effect lack of stoichiometry and reconfigurability. Here, we report a framework nucleic acids (FNA)-based strategy to increase thermodynamic stability of aptamers. Read More

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http://dx.doi.org/10.1021/acsnano.0c03362DOI Listing

Phospholipase A Inhibitor-Loaded Phospholipid Micelles Abolish Neuropathic Pain.

ACS Nano 2020 Jun 4. Epub 2020 Jun 4.

Department of Bioengineering, University of Pennsylvania, 210 South 33rd Street, 240 Skirkanich Hall, Philadelphia, Pennsylvania 19104, United States.

Treating persistent neuropathic pain remains a major clinical challenge. Current conventional treatment approaches carry a substantial risk of toxicity and provide only transient pain relief. In this work, we show that the activity and expression of the inflammatory mediator secretory phospholipase-A (sPLA) enzyme increases in the spinal cord after painful nerve root compression. Read More

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http://dx.doi.org/10.1021/acsnano.0c00999DOI Listing

Room-Temperature Lasing from Mie-Resonant Non-Plasmonic Nanoparticles.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Subwavelength particles supporting Mie resonances underpin a strategy in nanophotonics for efficient control and manipulation of light by employing both electric and magnetic optically-induced multipolar resonant response. Here we demonstrate that monolithic dielectric nanoparticles made of CsPbBr3 halide perovskites can exhibit both efficient Mie-resonant lasing and structural coloring in visible and near-IR frequency ranges. We employ a simple chemical synthesis with nearly epitaxial quality for fabricating small cubes with high optical gain and small size as low as 310 nm, and demonstrate single-mode lasing governed by the Mie resonances. Read More

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http://dx.doi.org/10.1021/acsnano.0c01468DOI Listing

Assembly of a Fluorescent Chiral Photonic Crystal Membrane and Its Sensitive Responses to Multiple Signals Induced by Small Molecules.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, P.R. China.

Chiral liquid crystal materials that are responsive to environmental stimuli are in demand. A chiral photonic crystal membrane based on cellulose nanocrystals (CNCs) was prepared by molecule assembly in the present work. A fluorescent molecule containing a cationic group, [-(3--benzyl-,-dimethylpropyl ammonium chloride)-1,8-naphthalimide]hydrazine, was assembled on the surface of the CNCs. Read More

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http://dx.doi.org/10.1021/acsnano.0c02883DOI Listing

Multifunctional Supramolecular Assemblies with Aggregation-Induced Emission (AIE) for Cell Line Identification, Cell Contamination Evaluation, and Cancer Cell Discrimination.

ACS Nano 2020 Jun 4. Epub 2020 Jun 4.

Department of Chemical and Biological Engineering, Department of Chemistry, and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

It is undoubted the important role of cells in biology and medicine, but worldwide misidentified and cross-contaminated cell lines have caused much trouble in related fields. Herein, three kinds of supramolecular AIE (aggregation-induced emission) nanoassemblies were constructed by the host-guest interaction between tetraphenylethene (TPE) derivatives and cucurbit[8]uril (CB[8]). Based on the recognized mechanism of AIE, the TPE derivatives could achieve stronger fluorescence emission and higher fluorescence quantum yield after assembling with CB[8]. Read More

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http://dx.doi.org/10.1021/acsnano.0c03404DOI Listing

Phase Diagram and Structure Map of Binary Nanoparticle Superlattices from a Lennard-Jones Model.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States.

A first-principles prediction of the binary nanoparticle phase diagram assembled by solvent evaporation has eluded theoretical approaches. In this paper, we show that a binary system interacting through the Lennard-Jones (LJ) potential contains all experimental phases in which nanoparticles are effectively described as quasi hard spheres. We report a phase diagram consisting of 53 equilibrium phases, whose stability is quite insensitive to the microscopic details of the potentials, thus giving rise to some type of universality. Read More

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http://dx.doi.org/10.1021/acsnano.0c00250DOI Listing

Recent Advances in Flexible and Stretchable Sensing Systems: From the Perspective of System Integration.

ACS Nano 2020 Jun 1. Epub 2020 Jun 1.

Biological signals generated during various biological processes are critically important for providing insight into the human physiological status. Recently, there have been many great efforts in developing flexible and stretchable sensing systems to provide biological signal monitoring platforms with intimate integration with biological surfaces. Here, this review summarizes the recent advances in flexible and stretchable sensing systems from the perspective of electronic system integration. Read More

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http://dx.doi.org/10.1021/acsnano.0c01164DOI Listing

Bio-inspired Photonic Masquerade with Perturbative Metasurfaces.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore.

Camouflage is critical for many living organisms to survive in the natural world and has stimulated applications, such as optical cloaking and military affairs. However, most applications adopt crypsis-type camouflage that prevents the organisms from being detected by matching the environment, which is challenging to realize the large angle-of-view and broadband operation at optical frequencies. Here, as inspired by nature's system of masquerade, we demonstrate an optical masquerade, being detected but not recognized, with perturbative metasurfaces that could camouflage an object into another unrelated one under the oblique (±69°) illumination of visible light with an ∼160 nm bandwidth. Read More

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http://dx.doi.org/10.1021/acsnano.0c03401DOI Listing

A Photo-Activated H2 Nanogenerator for Enhanced Chemotherapy of Bladder Cancer.

ACS Nano 2020 Jun 1. Epub 2020 Jun 1.

Hydrogen gas can mitigate oxidative stress in many diseases that is regarded to be safe and free of side effect. Inspired by a metalloenzyme in a variety of microorganisms, here we propose a photo-activated H2 nanogenerator that comprises a fluorinated chitosan (FCS), a chemotherapeutic drug (Gemcitabine, GEM), and a catalyst of H2 production ([FeFe]TPP) that can form self-assembled [FeFe]TPP/GEM/FCS nanoparticles (NPs). The [FeFe]TPP/GEM/FCS NPs exhibit excellent transmucosal and tumor cell penetration capacities after intravesical instillation into the bladder, and can efficiently produce H2 gas in situ upon a 660 nm laser irradiation, which significantly enhances the efficacy of hydrogen-chemotherapy of cancer in vitro and in vivo. Read More

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http://dx.doi.org/10.1021/acsnano.0c01300DOI Listing

Atomic-Scale Dynamics Probed by Photon Correlations.

ACS Nano 2020 Jun 1. Epub 2020 Jun 1.

Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany.

Light absorption and emission have their origins in fast atomic-scale phenomena. To characterize these basic steps (.. Read More

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http://dx.doi.org/10.1021/acsnano.0c03704DOI Listing

Vacancy Occupation-Driven Polymorphic Transformation in Cobalt Ditelluride for Boosted Oxygen Evolution Reaction.

ACS Nano 2020 Jun 1. Epub 2020 Jun 1.

Transition metal dichalcogenides (TMDs) hold great potential as an advanced electrocatalyst for oxygen evolution reaction (OER), but to date the activity of transition metal telluride catalysts are demonstrated to be poor for this reaction. In this study, we report the activation of CoTe2 for OER by doping secondary anions into Te vacancies to trigger structural transition from hexagonal to orthorhombic phase. The achieved orthorhombic CoTe2 with partial vacancies occupied by P-doping exhibits an exceptional OER catalytic activity with an overpotential of only 241 mV at 10 mA cm-2 and a robust stability more than 24 h. Read More

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http://dx.doi.org/10.1021/acsnano.0c01456DOI Listing

Suppressing Subcapsular Sinus Macrophages Enhances Transport of Nanovaccines to Lymph Node Follicles for Robust Humoral Immunity.

ACS Nano 2020 Jun 1. Epub 2020 Jun 1.

Nanovaccines need to be transported to lymph node follicles to induce humoral immunity and generate neutralized antibody. Here we discovered that subcapsular sinus macrophages play a barrier role to prevent nanovaccines from accessing lymph node follicles. This is illustrated by measuring the humoral immune responses after removing or functionally altering these cells in the nanovaccine transport process. Read More

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http://dx.doi.org/10.1021/acsnano.0c02240DOI Listing

3D Crumpled Ultra-Thin 1T MoS2 for Inkjet Printing of Mg-Ion Asymmetric Micro-Supercapacitors.

ACS Nano 2020 Jun 1. Epub 2020 Jun 1.

Metallic molybdenum disulfide (MoS2), e.g., 1T phase, is touted as a highly promising material for energy storage that already displays a great capacitive performance. Read More

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http://dx.doi.org/10.1021/acsnano.0c02585DOI Listing

Repurposing Old Antibodies for New Diseases by Exploiting Cross-Reactivity and Multicolored Nanoparticles.

ACS Nano 2020 Jun 4. Epub 2020 Jun 4.

Department of Engineering, University of Massachusetts Boston, Boston, Massachusetts 02125, United States.

We exploit the cross-reactivity of dengue (DENV) and Zika (ZIKV) virus polyclonal antibodies for nonstructural protein 1 (NS1) to construct a selective sensor that can detect yellow fever virus (YFV) NS1 in a manner similar to chemical olfaction. DENV and ZIKV antibodies were screened for their ability to bind to DENV, ZIKV, and YFV NS1 by enzyme linked immunosorbent assay (ELISA) and in pairs in paper immunoassays. A strategic arrangement of antibodies immobilized on paper and conjugated to different colored gold NPs was used to distinguish the three biomarkers. Read More

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http://dx.doi.org/10.1021/acsnano.9b09049DOI Listing

Development of Optimized Tissue-Factor-Targeted Peptide Amphiphile Nanofibers to Slow Noncompressible Torso Hemorrhage.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Department of Surgery and Center for Nanotechnology in Drug Delivery, University of North Carolina, Chapel Hill, North Carolina 27599, United States.

Noncompressible torso hemorrhage accounts for a significant portion of preventable trauma deaths. We report here on the development of injectable, targeted supramolecular nanotherapeutics based on peptide amphiphile (PA) molecules that are designed to target tissue factor (TF) and, therefore, selectively localize to sites of injury to slow hemorrhage. Eight TF-targeting sequences were identified, synthesized into PA molecules, coassembled with nontargeted backbone PA at various weight percentages, and characterized circular dichroism spectroscopy, transmission electron microscopy, and X-ray scattering. Read More

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http://dx.doi.org/10.1021/acsnano.9b09243DOI Listing

Universal Interfacial Control through Polymeric Nanomosaic Coating for Block Copolymer Nanopatterning.

ACS Nano 2020 Jun 4. Epub 2020 Jun 4.

School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea.

The employment of self-assembly of soft materials has been accepted as an inexpensive, robust, and reliable patterning method. As their self-assembly relies on the delicate molecular interactions near the substrate, a precise prediction/control of the interface structure and dynamics is critical to achieve desired nanostructures. Herein, a polymeric nanomosaic (PNM) pattern is created from the air/water interfacial self-assembly of a block copolymer (BCP) and introduced as an effective interfacial energy control for substrates. Read More

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http://dx.doi.org/10.1021/acsnano.0c01957DOI Listing

Extraction of Two-Dimensional Aluminum Alloys from Decagonal Quasicrystals.

ACS Nano 2020 May 29. Epub 2020 May 29.

Atomically thin metallic alloys will be exciting due to their prospective applications as interconnects/contacts in two-dimensional (2D) circuits, sensors, and catalysts. Here we demonstrate an and easily scalable technique for the synthesis of 2D metallic alloys from their quasicrystalline solid precursors. We have used Aluminum (Al) based single phase decagonal quasicrystal in Al66Co17Cu17 alloy to extract the respective 2D alloy structure. Read More

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http://dx.doi.org/10.1021/acsnano.0c03081DOI Listing

Optical and Electronic Ion Channel Monitoring from Native Human Membranes.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, CB30AS Cambridge, United Kingdom.

Transmembrane proteins represent a major target for modulating cell activity, both in terms of therapeutics drugs and for pathogen interactions. Work on screening such therapeutics or identifying toxins has been severely limited by the lack of available methods that would give high content information on functionality (ideally multimodal) and that are suitable for high-throughput. Here, we have demonstrated a platform that is capable of multimodal (optical and electronic) screening of ligand gated ion-channel activity in human-derived membranes. Read More

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http://dx.doi.org/10.1021/acsnano.0c01330DOI Listing

The Design and Science of Polyelemental Nanoparticles.

ACS Nano 2020 May 29. Epub 2020 May 29.

Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

Polyelemental nanoparticles (PE NPs) containing four or more elements in a single NP have intriguing intrinsic properties compared to their single-element counterparts. The fusion of diverse elements induces synergistic effects including new physical and chemical phenomena. However, conventional methods have not offered effective strategies for the uniform creation of PE NPs with high reproducibility. Read More

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http://dx.doi.org/10.1021/acsnano.0c03993DOI Listing

Tailored Reconstituted Lipoprotein for Site-Specific and Mitochondria-Targeted Cyclosporine A Delivery to Treat Traumatic Brain Injury.

ACS Nano 2020 May 28. Epub 2020 May 28.

The secondary damage in traumatic brain injury (TBI) can lead to lifelong disabilities, bringing enormous economic and psychological burden to patients and their families. Mitochondria, as the core mediator of secondary injury cascade reaction in TBI, is an important target to prevent the spread of cell death and dysfunction. Thus, therapeutics that can accumulate at the damaged sites and subsequently rescue the functions of mitochondria would largely improve the outcome of TBI. Read More

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http://dx.doi.org/10.1021/acsnano.9b09186DOI Listing

Rational Design of a NiN Electrocatalyst to Accelerate Polysulfide Conversion in Lithium-Sulfur Batteries.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Jiangsu, 210093, People's Republic of China.

Slow kinetics of polysulfide conversion reactions lead to severe issues for lithium-sulfur (Li-S) batteries, for example, low rate capability, polysulfide migration, and low Coulombic efficiencies. These challenges hinder the practical applications of Li-S batteries. In this study, we proposed a rational strategy of tuning the d-band of catalysts to accelerate the conversion of polysulfides. Read More

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http://dx.doi.org/10.1021/acsnano.9b09371DOI Listing

Pulmonary Delivery of Nanoparticle-Bound Toll-like Receptor 9 Agonist for the Treatment of Metastatic Lung Cancer.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States.

CpG oligodeoxynucleotides are potent toll-like receptor (TLR) 9 agonists and have shown promise as anticancer agents in preclinical studies and clinical trials. Binding of CpG to TLR9 initiates a cascade of innate and adaptive immune responses, beginning with activation of dendritic cells and resulting in a range of secondary effects that include the secretion of pro-inflammatory cytokines, activation of natural killer cells, and expansion of T cell populations. Recent literature suggests that local delivery of CpG in tumors results in superior antitumor effects as compared to systemic delivery. Read More

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http://dx.doi.org/10.1021/acsnano.0c02207DOI Listing

Light-Driven Hovering of a Magnetic Microswarm in Fluid.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Sha Tin, Hong Kong, China.

Swarm behaviors are nature's strategies for performing cooperative work, and extensive research has been aimed at emulating these strategies in engineering systems. However, the implementation of vertical motion and construction of a 3D structure are still challenging. Herein, we propose a simple strategy for creating a hybrid-driven paramagnetic tornado-like microswarm in an aqueous solution by integrating the use of a magnetic field and light. Read More

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http://dx.doi.org/10.1021/acsnano.0c01464DOI Listing

Visualizing Orbital Content of Electronic Bands in Anisotropic 2D Semiconducting ReSe.

ACS Nano 2020 Jun 1. Epub 2020 Jun 1.

Department of Physics, University of Seoul, Seoul 02504, Republic of Korea.

Many properties of layered materials change as they are thinned from their bulk forms down to single layers, with examples including indirect-to-direct band gap transition in 2H semiconducting transition metal dichalcogenides as well as thickness-dependent changes in the valence band structure in post-transition-metal monochalcogenides and black phosphorus. Here, we use angle-resolved photoemission spectroscopy to study the electronic band structure of monolayer ReSe, a semiconductor with a distorted 1T structure and in-plane anisotropy. By changing the polarization of incoming photons, we demonstrate that for ReSe, in contrast to the 2H materials, the out-of-plane transition metal d and chalcogen p orbitals do not contribute significantly to the top of the valence band, which explains the reported weak changes in the electronic structure of this compound as a function of layer number. Read More

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http://dx.doi.org/10.1021/acsnano.0c01054DOI Listing

Gold Nanoparticle-Assisted Black Silicon Substrates for Mass Spectrometry Imaging Applications.

ACS Nano 2020 May 28. Epub 2020 May 28.

Mass spectrometry imaging (MSI) based on matrix-assisted laser desorption ionization (MALDI) is widely used in proteomics. However, matrix-free technologies are gaining popularity for detecting low molecular mass compounds. Small molecules were analyzed with nanostructured materials as ionization promoters, which produce low-to-no background signal, and facilitate enhanced specificity and sensitivity through functionalization. Read More

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http://dx.doi.org/10.1021/acsnano.0c00201DOI Listing

Emerging Opportunities for Electrostatic Control in Atomically Thin Devices.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.

Electrostatic control of charge carrier concentration underlies the field-effect transistor (FET), which is among the most ubiquitous devices in the modern world. As transistors and related electronic devices have been miniaturized to the nanometer scale, electrostatics have become increasingly important, leading to progressively sophisticated device geometries such as the finFET. With the advent of atomically thin materials in which dielectric screening lengths are greater than device physical dimensions, qualitatively different opportunities emerge for electrostatic control. Read More

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http://dx.doi.org/10.1021/acsnano.0c03299DOI Listing

Circularly Polarized Photoluminescence from Chiral Perovskite Thin Films at Room Temperature.

ACS Nano 2020 Jun 3. Epub 2020 Jun 3.

Institute for Complex Molecular Systems, Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Hybrid organic-inorganic perovskites allow the synthesis of high-quality, nanostructured semiconducting films via easily accessible solution-based techniques. This has allowed tremendous development in optoelectronic applications, primarily solar cells and light-emitting diodes. Allowed by the ease of access to nanostructure, chirality has recently been introduced in semiconducting perovskites as a promising way to obtain advanced control of charge and spin and for developing circularly polarized light sources. Read More

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http://dx.doi.org/10.1021/acsnano.0c03628DOI Listing

High-Mobility InO:H Electrodes for Four-Terminal Perovskite/CuInSe Tandem Solar Cells.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland.

Four-terminal (4-T) tandem solar cells (.., perovskite/CuInSe (CIS)) rely on three transparent conductive oxide electrodes with high mobility and low free carrier absorption in the near-infrared (NIR) region. Read More

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http://dx.doi.org/10.1021/acsnano.0c03265DOI Listing

Enhanced Reduction of Thermal Conductivity in Amorphous Silicon Nitride-Containing Phononic Crystals Fabricated Using Directed Self-Assembly of Block Copolymers.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, United States.

Studies have demonstrated that the thermal conductivity (κ) of crystalline semiconductor materials can be reduced by phonon scattering in periodic nanostructures formed using templates fabricated from self-assembled block copolymers (BCPs). Compared to crystalline materials, the heat transport mechanisms in amorphous inorganic materials differ significantly and have been explored far less extensively. However, thermal management of amorphous inorganic solids is crucial for a broad range of semiconductor devices. Read More

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http://dx.doi.org/10.1021/acsnano.0c01463DOI Listing

Lasing Action in Single Subwavelength Particles Supporting Supercavity Modes.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634.

On-chip light sources are critical for the realization of fully integrated photonic circuitry. So far, semiconductor miniaturized lasers have been mainly limited to sizes on the order of a few microns. Further reduction of sizes is challenging fundamentally due to the associated radiative losses. Read More

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http://dx.doi.org/10.1021/acsnano.0c02730DOI Listing

Chiral Assembly of Gold-Silver Core-Shell Plasmonic Nanorods on DNA Origami with Strong Optical Activity.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

Faculty of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-University, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.

The spatial organization of metal nanoparticles has become an important tool for manipulating light in nanophotonic applications. Silver nanoparticles, particularly silver nanorods, have excellent plasmonic properties but are prone to oxidation and are therefore inherently unstable in aqueous solutions and salt-containing buffers. Consequently, gold nanoparticles have often been favored, despite their inferior optical performance. Read More

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http://dx.doi.org/10.1021/acsnano.0c03127DOI Listing

Long-Range Exciton Diffusion in Two-Dimensional Assemblies of Cesium Lead Bromide Perovskite Nanocrystals.

ACS Nano 2020 Jun 2. Epub 2020 Jun 2.

The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.

Förster resonant energy transfer (FRET)-mediated exciton diffusion through artificial nanoscale building block assemblies could be used as an optoelectronic design element to transport energy. However, so far, nanocrystal (NC) systems supported only diffusion lengths of 30 nm, which are too small to be useful in devices. Here, we demonstrate a FRET-mediated exciton diffusion length of 200 nm with 0. Read More

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http://dx.doi.org/10.1021/acsnano.0c01536DOI Listing

Emerging Implantable Energy Harvesters and Self-Powered Implantable Medical Electronics.

ACS Nano 2020 Jun 1. Epub 2020 Jun 1.

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, China.

Implantable energy harvesters (IEHs) are the crucial component for self-powered devices. By harvesting energy from organisms such as heartbeat, respiration, and chemical energy from the redox reaction of glucose, IEHs are utilized as the power source of implantable medical electronics. In this review, we summarize the IEHs and self-powered implantable medical electronics (SIMEs). Read More

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http://dx.doi.org/10.1021/acsnano.9b08268DOI Listing

In Nano, Volume 14, Issue 5.

ACS Nano 2020 May;14(5):5157-5160

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http://dx.doi.org/10.1021/acsnano.0c03930DOI Listing

Melbourne-Australia's Science City.

Authors:
Paul Mulvaney

ACS Nano 2020 May;14(5):5153-5156

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http://dx.doi.org/10.1021/acsnano.0c04003DOI Listing