We report a simple and rapid method to prepare multifunctional free-standing single-walled carbon nanotube (SWCNT) films with variable thicknesses ranging from submonolayer few micrometers having outstanding properties for broad range of exceptionally performing devices. have fabricated state-of-the-art key components the same single component SWCNT material several high-impact application areas: high efficiency nanoparticle filters figure merit 147 Pa(-1), transparent conductive electrodes...

The aim of this work was to investigate the influence morphology on its electrochemical properties by comparing ZnO nanostructures in forms tetrapods different sizes, nanorods, and nanoparticles. were prepared combustion method separated into two fractions size, ruling out synthesis conditions. Structural morphological nanostructure morphologies identified using various characterization techniques: scanning transmission electron microscopies (SEM TEM), X-ray powder diffraction (XRD),...

We propose a simple method for the efficient and rapid synthesis of one-dimensional hematite (α-Fe2O3) nanostructures based on electrical resistive heating iron wire under ambient conditions. Typically, 1–5 μm long α-Fe2O3 nanowires were synthesized time scale seconds at temperatures around 700 ° ⊂. The morphology, structure, mechanism formation studied by scanning transmission electron microscopies, energy dispersive X-ray spectroscopy, photoelectron Raman techniques. A nanowire growth...

Superhydrophobic surfaces are important parts of many applications in cleaning and protective coatings. Such can be realized by controlling the surface chemistry nanoscale structure. Elongated ZnO nanostructures, called nanowires, often used superhydrophobic due to their intrinsic characteristic advantages simple synthesis control. This review presents a critical overview latest research activities focused on nanowire surfaces. A wettability mechanism background is introduced with overlay...

Nanowires (NWs) of metal oxides (Fe2O3, CuO, V2O5 and ZnO) were grown by an efficient non-catalytic economically favorable method based on resistive heating pure wires or foils at ambient conditions. The growth rate iron oxide NWs exceeds 100 nm s−1. Produced typically 1–5 µm long with diameters from 10 to 50 nm. produced characterized means SEM, TEM, EDX, XPS Raman techniques. field emission measurements the as-produced CuO found have a threshold as low 4 V µm−1 0.01 mA cm−2. formation...

The majority of the nanowire synthesis methods utilize catalyst particles to guide geometry. In contrast, catalyst-free are attractive for facile fabrication pure nanowires without need preparation. Nonetheless, how growth is guided a still widely disputed and unclear. Here, we show that during metal oxidation limited by nucleation new layer. On basis in situ transmission electron microscope investigations found occurs layer at lowest specific surface energy planes. Atomic layers nucleate...

ZnO tetrapods (ZnO-Ts) were synthesized in a vertical flow reactor by gas phase oxidation of Zn vapor an air atmosphere. The morphology the product was varied from nearly spherical nanoparticles to ZnO-Ts, together with partial pressure and reaction temperature. MgO introduced during synthesis, increased band gap, optical transparency visible range, also changed ZnO-T structure. Fabricated flexible transparent UV sensors showed 45-fold current increase under irradiation intensity 30 μW cm−2...

In this work we propose a novel continuous method for zinc oxide tetrapod (ZnO-T) synthesis based on the combustion of micron-sized Zn particles in an air atmosphere. A stable geometry ZnO-T structures produced over wide temperature range gram quantities was obtained. Stable growth conditions were determined by self-sustainable around particle, as supported thermodynamic analysis. ZnO-Ts had high crystallinity, average leg diameter 15 ± 5 nm, and length 200 100 nm. practical application...

Glass is the most widely used transparent material for photovoltaic (PV) panels. Unfortunately, glass introduces an additional interface and therefore optical losses, which can be mitigated using antireflection (AR) coatings. This article reports a scalable method to prepare AR coatings from ZnO nanowires (NWs) sorted by their size. The measured performance depends on coating coverage NW size, explained scattering absorption cross section simulations. Randomly oriented size fractioned NWs...

Modern high-performance photodetector research is driven by the need to simultaneously improve multiple parameters, but also fit decreasing size of electronics and maintain low production price. Here, we demonstrated how our synthesized ZnO tetrapod (ZnO-T) nanostructure was deposited on electrodes with variating gap four coating methods including drop casting, microdrop spray slot-die same thickness. Optimizing inter-electrode method record IUV/IDark ratio per unit area value 8.73 × 106...

ZnO nanowire (NW) growth mechanism was investigated in a nonvapor and noncatalytic approach for the controlled NW synthesis second time scale. The experimental results showed what determined by migration of zinc interstitials vacancies layer, which should be also considered other techniques mechanisms. explained as due to advantageous diffusion through grain boundaries layer crystal defects NWs. Additionally, on basis photoluminescence measurements, feasible application as-produced wires...

A simple and scalable method was developed for the fabrication of wearable strain bending sensors, based on high aspect ratio (length/thickness ∼10(3)) graphite nanobelt thin films deposited by a modified Langmuir-Blodgett technique onto flexible polymer substrates. The sensing mechanism is changes in contact resistance between individual nanobelts upon substrate deformation. Very sensor response stability more than 5000 strain-release cycles device power consumption as low 1 nW were...

Zinc oxide nanoparticles (ZnO NPs) have acquired great significance in the textile sector due to their impressive efficiency and multifold utilization, such as antimicrobials, UV protection, photo catalytic activity, self-cleaning. The aim of this work is in-situ growth ZnO NPs on 100% cotton fabrics with one-step hydrothermal method for preparation multifunctional protecting, antibacterial, properties. Sodium hydroxide (NaOH) nitrate hexahydrate [Zn(NO3)2·6H2O] were used reactants zinc...

The metal oxide nanowires were produced by a resistive heating of various metals under ambient conditions at normal atmospheric pressure. obtained CuO, V2O5, ZnO, Fe2O3 typically 1–5 m in length and 10–50 nm diameter. Field emission properties the oxidized surfaces covered nanowires, including current–voltage dependencies distribution sites, measured flat diode configuration with use phosphor coated anode. data on field compared structural characteristics nanowires. highest efficiency (with...

Nanowire synthesis without catalyst offers a simple technique for efficient growth of pure nanowires, which provides number advanced applications. If particles are not utilized, there many open questions, related to nanowire formation and mechanisms. Such questions limit the possibility control structure, therefore hindering their wide range This review is devoted noncatalytic nanowires studies mechanisms by means in situ transmission electron microscopy shedding light on atomic scale...

We report on the enhancement of electrical photoresponse in a hybrid structure composed multi-layer graphene flakes covered by layer CdSe/ZnS quantum dots (QDs) and placed between metal electrodes. The rate photoexcitation energy transfer from QDs to graphene, (0.5–2)×109 s−1 which controls photoelectrical response structure, was found analysis photoluminescence intensities decay times for solution, bare glass substrate surface multilayer presence ammonia vapors.

Fundamental concepts of the crystal formation suggest that growth and decomposition are determined by simultaneous embedding removal atoms. Apparently, changing conditions one can switch regimes from to decomposition. To best our knowledge, so far this has been only postulated, but never observed at atomic level. By means in situ environmental transmission electron microscopy we monitored examined layer transformation its using CuO nanowires selected as a model object. The...

The aim of this work was to investigate how ZnO tetrapod (ZnO-T) morphology, structure, and surface charge properties (i.e. Debye length) influence their UV sensing properties, shedding light on the underlying photoresponse mechanisms. ZnO-Ts were synthesized centrifuged obtain three different fractions with tuned which characterized by scanning electron microscopy, transmission high-resolution microscopy microscopies, x-ray diffraction analysis, Brunauer-Emmett-Teller measurements, FTIR...