Abstract In stark contrast to ordinary metals, in materials which electrons strongly interact with each other or phonons, electron transport is thought resemble the flow of viscous fluids. Despite their differences, it predicted that both conventional and correlated fundamentally limited by uncertainty principle applied energy dissipation. Here we report observation experimental signatures hydrodynamic Weyl semimetal tungsten diphosphide. Using thermal magneto-electric experiments, find...

Molecular self-attack: According to mythology, a scorpion may sting itself death; similarly, 3-aminopropyltriethoxysilane catalyzes its own hydrolysis in the atomic layer deposition (ALD) of SiO2 thin films and nanostructures. Between 120 200 °C, growth rate is constant at 0.06 nm per ALD cycle. The are chemically optically pure. nanotubes aspect ratio 500 exhibit smooth walls accurately controlled thickness. Supporting information for this article available on WWW under...

Abstract Resistive random‐access memory (RRAM) stands out as a promising technology due to its ease of operation, high speed, affordability, exceptional stability, and potential enable smaller devices with sizes under 10 nm. This has drawn significant attention, atomic layer deposition (ALD) emerging an ideal tackle the challenges nanoscale fabrication in micro‐ nanomanufacturing industry. ALD offers technological advantages such functional multiple‐layer stacking, doping capabilities,...

SiO 2 is the most widely used dielectric material but its growth or deposition involves high thermal budgets suffers from shadowing effects. The low-temperature method presented here (150 °C) for preparation of SiO2 by atomic layer (ALD) provides perfect uniformity and surface coverage even into nanoscale pores, which may well suit recent demands in nanoelectronics nanotechnology. ALD reaction based on 3-aminopropyltriethoxysilane, water, ozone outstanding quality free catalysts corrosive...

The thermoelectric (TE) figure of merit ZT topological insulator Bi2Te3, Sb2Te3, and Bi2Se3 thin film quantum wells is calculated for thicknesses below 10 nm, which hybridization the surface states as well confinement in bulk are individually predicted to enhance ZT. Here, question addressed what can be expected from coexisting such wells. It demonstrated that parallel contributing channels tend cancel each other out. This because surface-to-volume ratios films prevent domination transport...

Nickel-rich NiFe nanowires with well-controlled diameters and compositions are fabricated in various porous alumina templates by using a pulsed electrochemical deposition technique. The average pore diameter of the is tuned either coating walls thin silica layers an atomic layer (ALD) technique or applying chemical widening process. composition alloy controlled varying frequency pulse. coercivity nanowire array influenced its texture amount iron content alloy. effective field saturation...

We report on the experimental and theoretical investigation of magnetization reversal in magnetic nanotubes that have been synthesized by a combination glancing angle atomic layer deposition. Using superconducting quantum interference device magnetometry angular dependence coercive fields is determined reveals nonmonotonic behavior. Analytical calculations predict crossover between two modes, namely, movement different types domain boundaries (vortex wall transverse wall). This transition,...

Herein, we demonstrate that meticulous and in-depth analysis of the reaction mechanisms nanoparticle formation is rewarded by full control size, shape, crystal structure superparamagnetic iron oxide nanocrystals during synthesis. Starting from two sources, iron(II) iron(III) carbonate, a strict separation oleate generation reactive pyrolysis products concomitant nucleation nanoparticles was achieved. This protocol enabled us to analyze each step independently in depth. The progress entire...

Low-temperature atomic layer deposition (ALD) of TiO2, SiO2, and Al2O3 was applied to modify the surface tailor diameter nanochannels in etched ion-track polycarbonate membranes. The homogeneity, conformity, composition coating inside are investigated for different channel diameters (18–55 nm) film thicknesses (5–22 nm). Small angle x-ray scattering before after ALD demonstrates conformal along full length. X-ray photoelectron spectroscopy energy dispersive provide evidence nearly...

Brain-on-a-chip (BoC) concepts should consider three-dimensional (3D) scaffolds to mimic the 3D nature of human brain not accessible by conventional planar cell culturing. Furthermore, essential key adequately address drug development for pathophysiological diseases nervous system, such as Parkinson's or Alzheimer's, is employ induced pluripotent stem (iPSC)-derived neurons instead from animal models. To both issues, we present electrophysiologically mature iPSC-derived cultured in BoC...

Nanoporous anodic alumina membranes (NPAMs) were produced by the two-step anodization method in sulphuric, oxalic and phosphoric acidic electrolytes displaying a hexagonally ordered spatial arrangement of pores with well controlled nanopore size distribution low porosity. Some selected NPAMs further modified conformal coating their surface inner pore walls thin layer SiO2 means atomic deposition (ALD), which reduces both radii porosity but it also seems to affect electric fixed charge on...

Ab initio electronic structure calculations based on density functional theory and tight-binding methods for the thermoelectric properties of p-type Sb2Te3 films are presented. The thickness-dependent electrical conductivity thermopower computed in diffusive limit transport Boltzmann equation. Contributions bulk surface to coefficients separated, which enables identify a clear impact topological state properties. When charge carrier concentration is tuned, crossover between...

Spectrally tunable nanoporous anodic alumina distributed Bragg reflectors (NAA-DBRs) are modified with titanium dioxide (TiO2) coatings via atomic layer deposition and used as model optoelectronic platforms to harness slow light for photocatalysis under visible–NIR illumination. Photocatalytic breakdown of methylene blue (MB) a visible absorbance band is benchmark reaction unveil the mechanism light-enhanced in TiO2–NAA-DBRs photonic stop (PSB) thickness TiO2. Assessment optical arrangement...

A combination of electrostatic force microscopy and optical was used to investigate the charge state individual CdSe nanowires upon local illumination with a focused laser beam. The were found be positively charged at excitation spot negatively distant end(s). For high powers, amount accumulated charges increases logarithmically power. These effects are described by diffusion-based model where results in good agreement experimentally observed effects. On basis this imbalance along nanowire...

The combination of superstructure-forming amphiphilic block copolymers and superparamagnetic iron oxide nanoparticles produces new nano/microcomposites with unique size-dependent properties. Herein, we demonstrate the controlled clustering (SPIOs) ranging from discretely encapsulated SPIOs to giant clusters, containing hundreds or even more particles, using an polyisoprene-block-poly(ethylene glycol) diblock copolymer. Within these interact each other show collective properties, neither...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of Iron Oxide Nanorods Using a Template Mediated ApproachHauke Kloust†‡, Robert Zierold§, Jan-Philip Merkl†‡, Christian Schmidtke†‡, Artur Feld†‡, Elmar Pöselt†‡, Andreas Kornowski†‡, Kornelius Nielsch§, and Horst Weller*†‡∥⊥View Author Information† Institute Physical Chemistry, University Hamburg, Grindelallee 117, 20146 Germany‡ The Hamburg Center for Ultrafast Imaging, Luruper Chaussee 149, 22761 Germany§ Nanostructure Solid...

There is currently substantial effort being invested into creating efficient thermoelectric (TE) nanowires based on topological insulator (TI) chalcogenide-type materials. A key premise of these efforts the assumption that generally good TE properties materials exhibit in bulk form will translate similarly or even better performance same nanowire form. Here, we calculate TI Bi2Te3, Sb2Te3 and Bi2Se3 as a function diameter Fermi level. We show does not derive from material straightforward...

Weyl semimetals are often considered the 3D-analogon of graphene or topological insulators. The evaluation quantum oscillations in these systems remains challenging because there multiple conduction bands. We observe de Haas-van Alphen with several frequencies a single crystal semimetal niobium phosphide. For each fundamental axis, we can fit raw data to superposition sinusoidal functions, which enables us calculate characteristic parameters all individual bulk bands using Fourier transform...

Vanadium dioxide (VO 2 ) is a well‐known candidate for memristor applications due to its insulator‐to‐metal transition (IMT) characteristics. The fabrication of devices requires highly controlled synthesis processes concerning the material chemistry and geometry. Atomic layer deposition (ALD) offers unique advantages hardware neural networks, such as miniaturization, conformality, sub‐nm thickness control. Herein, an ALD process non‐stoichiometric vanadium oxide x using...

A strategy for stacking multiple ceramic 3D photonic crystals is developed. Periodically structured porous films are produced by vertical convective self-assembly of polystyrene (PS) microspheres. After infiltration the opaline templates atomic layer deposition (ALD) titania and thermal decomposition matrix, a crystal formed. Further layers with different sizes pores deposited subsequently repetition process. The influence process parameters on morphology properties double triple stacks...

This work presents a synthesis route for low-aspect-ratio nanotubes consisting of layer magnetite (Fe3O4) sandwiched between SiO2 layers. In this template-based strategy, self-ordered porous alumina membranes are combined with the atomic deposition and Fe2O3. An optimized electrochemical setup yields nanoporous Al2O3 on 4-inch Al substrates, which serve as templates large-scale fabrication nanotubes. A selective chemical etching step releases magnetic tubes suspension in carrier fluid...