We report here detailed in situ studies of nucleation and growth Au on CdSe/CdS nanorods using synchrotron SAXS technique time-resolved spectroscopy. examine structural optical properties CdSe/CdS/Au heterostructures formed under UV illumination. compare the results for with control experiments exposed to gold precursor conditions when no such are (no illumination). Our data indicate similar photoluminescence (PL) quenching PL decay profiles both types samples. Via transient absorption PL,...

Long-range charge and exciton transport in quantum dot (QD) solids is a crucial challenge utilizing QDs for optoelectronic applications. Here, we present direct visualization of diffusion highly ordered CdSe superlattices by mapping population using ultrafast transient absorption microscopy. A temporal resolution ∼200 fs spatial precision ∼50 nm this technique provide assessment the upper limit QD solids. An length ∼125 has been visualized 3 ns experimental time window an coefficient (2.5 ±...

As batteries become more powerful and utilized in diverse applications, thermal management becomes one of the central problems their application. We report results on properties a set different Li-ion battery electrodes enhanced with multiwalled carbon nanotubes. Our measurements reveal that highest in-plane cross-plane conductivities achieved carbon-nanotube-enhanced reached up to 141 3.6 W/mK, respectively. The values for conductivity are 2 orders magnitude higher than those conventional...

Bacterial adhesion and spreading on biomaterials are considered key features of pathogenicity. Roughness topography the substrate have been reported to affect bacterial adhesion, but little is known about their effect spreading. Submicron row channel tuning with diameter (S2) were designed test motility these surfaces. Random nanometer-sized structures (S1) used as controls. Optical microscopy AFM employed detect biological surface pattern details in micro- nanoscale, respectively. Results...

The aggregation behavior and morphological characteristics of amphiphilic block copolymer polybenzyl methacrylate-block-poly(dimethylamino)ethyl methacrylate (PBzMA-b-PDMAEMA) at the air–water interface were investigated through surface pressure measurements, atomic force microscopy (AFM) imaging, electrochemical measurements X-ray reflectivity. Ionization PDMAEMA blocks significantly affects isotherms films and, consequently, originates different morphologies Langmuir–Blodgett obtained...

Doping is a well-known approach to modulate the electronic and optical properties of nanoparticles (NPs). However, doping at nanoscale still very challenging, reasons for that are not well understood. We studied formation process iron oxide NPs in real time by situ synchrotron X-ray absorption spectroscopy. Our study revealed mass flow triggered oxidation responsible internalization dopant (molybdenum) adsorbed surface host NPs. The induced allows controlling levels varying amount precursor....

Pattern transfer with high resolution is a frontier topic in the emerging field of nanotechnologies. Electrochemical molding possible route for nanopatterning metal, alloys and oxide surfaces simple inexpensive way. This method involves electrodeposition onto conducting master covered by self-assembled alkanethiolate monolayer (SAMs). molecular film enables direct surface-relief pattern from to inner face electrodeposit, also allows an easy release electrodeposited due their excellent...

Commercial LaAlO3 substrates were thermally cycled simulating a procedure similar to those followed during TiO2 and SnO2 dilute magnetic semiconductors’ film pulsed laser deposition. Ferromagneticlike behavior was found in some substrates, which metallic iron impurities detected by x-ray photoelectron spectroscopy total reflection fluorescence measurements. A thorough experimental investigation, using high resolution techniques, showed that these introduced the used fix oven silicon holders....

The growth of graphene on an irregular three-dimensional (3D) Ni structure is demonstrated to be interesting platform for molecular sensing, graphene-enhanced Raman scattering, and surface-enhanced scattering (SERS) applications after galvanic exchange Ag+ ions. Raman, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDX), optical images, diffuse reflectance demonstrate that grows in a multilayer fashion with different stacking configurations. Statistics performed...

The synergy between graphene foam (Gf) and ZnO nanoparticles (NPs) allows the detection of analytes at low conentrations, which can be subsequently photocatalyzed on hybrid surface as well in liquid phase upon illumination with low-power UV–vis light-emitting diode (LED) lamps. Detection methylene blue (MB) bisphenol A (BPA) is monitored either by graphene-enhanced Raman scattering (GERS) or molecular doping/sensing analyte adsorption. Using GERS, we were able to detect concentrations 0.3...

The way graphene (GDs) and carbon dots (CDs) are synthesized combined with TiO2 determine their photoelectrochemical efficiency upon UV visible LED lights. GDs CDs obtained by relatively unexplored top-down methods conventional bottom-up methods, respectively. Top-down consist in the seedless growth of ZnO nanoparticles on surface electrochemical cleavage grown Ni foam. These later different approaches such as solution mixing, adsorption via APTES linkers, drop-casting an already formed...

Because of their high electrical conductivity CoSi2 nanostructures are potential candidates for preparing ordered nano-arrays to be used as electrode interconnectors and contacts in microelectronic devices. We here describe a controlled procedure the endotaxial growth hexagonal nanoplatelets buried differently oriented single crystalline Si wafers on which Co-doped SiO2 thin film was previously deposited. These nanomaterials were obtained by clean consisting isothermal annealing at 750 °C...

A Co-doped silica film was deposited on the surface of a Si(100) wafer and isothermally annealed at 750 °C to form spherical Co nanoparticles embedded in few atomic layer thick CoSi2 nanoplatelets within wafer. The structure, morphology, spatial orientation were characterized. experimental results indicate that exhibit hexagonal shape uniform thickness. nanostructures lattice is coherent with Si lattice, each them parallel one four planes belonging {111} crystallographic host lattice.

We discuss some characteristic phenomena that take place when high-aspect-ratio metallic nanopatterns decay by surface diffusion. compare results obtained means of a continuous 2D model, kinetic 3D Monte Carlo and also experimental in which nanostructured Au surfaces during an annealing. In all these cases, we found structures are very stable against diffusion currents the area is much higher than one associated with compact material. According to our models, such usually complex exhibing...

Nanoripple structures spontaneously formed at room temperature during chemical and electrochemical deposition of metals, semiconductors, alloys on gold copper templates, patterned with nanocavities, have been studied by atomic force microscopy (AFM) scanning tunneling (STM). Annealing the templates ≈373 K also results in ripple formation. Both experimental modeling, including anisotropic surface diffusion, demonstrate that nanocavity size template determines wavelength amplitude, prior to a...

Silver nanodots and nanoripples have been grown on nanocavity-patterned polycrystalline Au templates by controlled electrodeposition. The initial step is the growth of a first continuous Ag monolayer followed preferential deposition at nanocavities. Ag-coated nanocavities act as preferred sites for instantaneous nucleation three-dimensional metallic centres. By controlling amount deposited Ag, dots ∼50 nm average size ∼4 height can be with spatial distributions dictated template. are in...

Abstract The infrared, Raman and electronic spectra of the oxovanadium (IV) complexes 3‐methyl 3‐ethyl substituted acetylacetone were recorded discussed in detail, comparison with that bis(acetylacetonato) complex on basis known structural data these compounds. electrochemical behavior three was investigated by cyclic voltammetry DMSO solutions, mechanism involved processes is briefly discussed.

<title>Abstract</title> TiO₂ nanotubes were grown by anodization of Ti sheets in an ethylene glycol solution. The then prepared tested with and without heat treatment at 450 ºC, for the water splitting process. was shown to increase photocurrent from 4.9 µA cm^-2 56,8 while being illuminated 0.7 V vs. SHE. Modification carried out electroreduction on both, treated untreated samples its photoactivity evaluated. A comparison photon-to-current made between before after...

TiO2 nanotubes were grown by anodization of Ti sheets in an ethylene glycol solution. The then prepared tested with and without heat treatment at 450 ºC, for the water splitting process. produced increased photocurrent from 4.9 µA cm−2 to 56.8 under illumination 0.7 V vs. SHE. Modification was carried out electroreduction on both treated untreated samples its photoactivity evaluated. spectral response showed reduced material (black titania), although no appreciable change detected absorbed...

We have studied the interface dynamics during growth of microscopic ordered Cu features deposited on different nonmetallic substrates by shadow-mask physical vapor deposition. Optical and atomic force microscopy data show formation either transparent or opaque patterned depending film thickness. The evolution film, shadowed exposed regions, pattern shape are well described in terms a continuous mesoscopic model, implying that masked deposition induces (through evaporation-condensation...

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