Abstract High concentrations of defects are introduced into nanoscale ZnO through non‐equilibrium processes and resultant blue emissions comprehensively analyzed, focusing on defect origins broad controls. Some nanoparticles exhibit very strong emissions, the intensity which first increase then decrease with annealing. These visible interesting excitation dependences: 1) optimal energy for is near bandgap energy, but effective can obviously be lower, even 420 nm (2.95 eV < E g = 3.26 eV);...

Abstract A novel ZnO hierarchical micro/nanoarchitecture is fabricated by a facile solvothermal approach in an aqueous solution of ethylenediamine (EDA). This complex architecture core/shell structure, composed dense nanosheet‐built networks that stand on hexagonal‐pyramid‐like microcrystal (core part). The hexagonal micropyramid has external surfaces consist basal plane (000 ${\bar 1}$ ) and lateral planes {0 11}. nanosheets are uniform thickness about 10 nm have single‐crystal structure...

A weak acid selective etching strategy was put forward to fabricate oxide-based hollow nanoparticles (HNPs) using core/shell nanostructures of active metal/oxide as sacrificial templates. ZnO-based HNPs, including pure ZnO, Au/ZnO, Pt/ZnO, and Au/Pt/ZnO HNPs with diameter below 50 nm shell thickness 6 has been first achieved at low temperature. The diameter, thickness, even sizes ZnO noble metal ultrafine crystals can be well adjusted by the process. Synchronous formation internal...

Background. Oxidative stress (OS) and inflammatory mediators increase with aging. The levels of advanced glycation endproducts (AGEs), prooxidant factors linked to chronic diseases such as diabetes, cardiovascular disease, renal also AGEs are readily derived from heat-treated foods. We propose that the excess consumption certain via diet enhances OS responses in healthy adults, especially elderly persons. Methods. examined 172 young (<45 years old) older (>60 individuals determine whether...

Abstract Exploring highly efficient and low‐cost electrocatalysts for electrochemical water splitting is of importance the conversion intermediate energy. Herein, synthesis dual‐cation (Fe, Co)‐incorporated NiSe 2 nanosheets Co‐NiSe ) systematical investigation their electrocatalytic performance as a function composition are reported. The incorporation can distort lattice induce stronger electronic interaction, leading to increased active site exposure optimized adsorption energy reaction...

We present composition-controlled synthesis of ZnO−Zn composite nanoparticles by laser ablation a zinc metal target in pure water or aqueous solution sodium dodecyl sulfate (SDS). By SDS concentration, composition and size the can be controlled wide range. Relative amounts components Zn ZnO, particle size, microstructure evolve with concentration solution. High corresponds to high relative amount existing as core core/shell nanostructures, whereas low leads ZnO amount. This was explained...

The photoluminescence properties of ZnO nanoneedle arrays, grown on silicon substrate by electrodeposition, are studied over the temperatures from 10K to 300K. There exist three emission bands in ultraviolet, violet, and green regions, respectively. With increasing temperature, these show different temperature dependences: A normal redshift for ultraviolet emission, S-shaped shift violet blueshift one. origins their temperature-dependent shifts explained based defect levels (zinc...

Nanostructured Ag nanoparticles (Ag-NPs)/nanoporous ZnO micrometer-rods (n-ZnO MRs) have been synthesized by a two-step method. The n-ZnO MRs was initially prepared solvothermal-assisted heat treatment. rods had the diameter ranged from 90 to 150 nm and length between 0.5 3 μm. They were found be porous composited of nanopartiles with size about 20 nm. In second stage, Ag-NPs 20-50 anchored onto surface as-prepared photoreduction Ag-NPs/n-ZnO evaluated for their ability degrade methylene...

A facile approach for the fabrication of novel black plasmonic colloidosomes assembled from Au nanospheres is developed by an emulsion-templating strategy. This self-assembly process based on a new reverse water-in-1-butanol emulsion system, in which water droplets can dissolve into 1-butanol (oil) phase at appropriate rate. These possess hexagonal close-packed multilayer shells and show low reflectivity intense broadband absorption owing to strong interparticle coupling, further...

Periodic porous alloyed Au-Ag nanosphere (NS) arrays with different periodic lengths and tunable composition ratios were prepared on Si substrates a large scale (∼cm2) using stepwise metal deposition-annealing subsequent chemical corrosion from monolayer of colloidal polystyrene (PS) microspheres as the initial template. The NSs possessed high porosity bicontinuous morphology composed hierarchically interconnected ligaments, which obtained an optimized dealloying process in nitric acid....

Abstract Monodentate adsorption of oxygen intermediates results in a theoretical overpotential limit ≈0.35 V for evolution reaction (OER), which causes the sluggish kinetics OER process. In this work, nonprecious chromium dopant is introduced into self‐supported CoFe layered double hydroxides (LDHs) on nickel foam (Cr‐CoFe LDHs/NF) via facile one‐step hydrothermal method, exhibits preeminent electrocatalytic activity toward with an ultralow 238 mV to obtain 10 mA cm −2 and high stability...

Besides the traditional lithographical techniques to fabricate ordered mciro/nanostructured arrays, route of monolayer colloidal crystal template is a recently promising, alternative process for synthesis micro/nanostructures with different designed morphologies. By this strategy, two-dimensional e.g., nanoparticle pore nanoring nanobowl hollow sphere etc., even one-dimensional nanostructures nanorod/nanopillar/nanowire could be prepared. Recent progress in area reviewed, including...

In this paper, a low-temperature controllable chemical bath deposition method was demonstrated to prepare one-dimensional ZnO nanorods and two-dimensional nanoplates, their surface-related emissions were studied by temperature-dependent cathodoluminescence spectra. By changing the precursor concentration, morphology evolves from nanoplates. grow fast along c-axis direction due high surface energy of polar (0001) plane when concentration OH- ions is low in solution. When increased, more...

A facile route was presented for mass fabrication of porous ZnO nanoplates, with a yield >94%, based on solvothermal method, using ethylene glycol as the morphology director, and subsequent annealing process. The as-prepared nanoplates are composed two terminal non-polar planes several microns in planar dimensions 10–15 nm thickness. pore diameter 5–20 high specific surface area (147 m2 g−1). Importantly, such show strong selective adsorption to cationic contaminants. Especially, they can...

Micro/nanoscale magnesium silicate hollow spheres were synthesized by using silica colloidal as a chemical template in one pot. The spherical structure, consisting of well-separated nanoscale units, was microscale whole and could be easily handled solution. as-synthesized with large specific surface area showed availability for the removal organic heavy-metal ions efficiently from waste water. Importantly, micro/nanoscale that had adsorbed pollutants regenerated calcination used repeatedly...

Pieces of eight: Single-crystalline Au nano-octahedra with well-defined shape and tunable size can be synthesized by a modified polyol process. The octahedral nanocrystals have sharp corners display optical properties that are sensitive to the crystal sizes truncation tips. Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z604167_s.pdf or from author. Please note: publisher not responsible content functionality any supporting...

A strong violet photoluminescence (PL) band at 425nm (2.92eV) was observed from the ZnO shell layer of Zn∕ZnO core-shell nanoparticles prepared by laser ablation in liquid media. Such PL decreases with increase thickness or annealing temperature, showing good controllability. Based on electron paramagnetic resonance measurements, emission is attributed to electronic transition defect level, corresponding high-concentration zinc interstitials, valence band. This study favor clarify...

Abstract The fluorescence of nanoparticles has attracted much attention in recent research, but many cases the underlying mechanisms are difficult to evaluate due polydispersity and their unknown structures, particular surface structures. Recent breakthroughs syntheses structure determinations well‐defined gold nanoclusters provide opportunities conduct in‐depth investigations. Devising nanocluster sensors based on change is interest not only for scientific studies also practical...

Flexible structural design and accurate controlled fabrication with tunability according to need for binary or multicomponent colloidal crystals have been expected. However, it is still a challenge. In this work, the phase diagram of monolayer (bCCs) established on assumption that both large small polystyrene (PS) spheres can stay at air/water interface, range size ratio number presented. From diagram, combining we relatively accurately control bCCs specific structures (or patterns) need,...

Abstract The fabrication of a hierarchically structured Ni(OH) 2 monolayer hollow‐sphere array with the shell composed building blocks nanoflakelets is demonstrated based on colloidal and electrochemical deposition. morphology can be easily controlled by deposition parameters. Importantly, such shows morphology‐ size‐dependent tunable optical transmission stop band. This band tuned from 455–1855 nm changing size hollow spheres between 1000 4500 nm, also fine‐adjusted time. exhibits nearly...