Polycrystalline ZnO nanowires have been grown in anodic aluminum oxide templates using a dry vapor‐deposition method. The high aspect ratio and uniform density of 10 –10 11 cm –2 over large area (∼ 20 mm 2 ). Room‐temperature photoluminescence measurements show lasing modes between 381 389 nm above threshold power 100 kW/cm (see Figure).

An ionic-liquid-based Zn salt electrolyte is demonstrated to be an effective route solve both the side-reaction of hydrogen evolution reaction (HER) and Zn-dendrite growth in Zn-ion batteries. The developed enables hydrogen-free, dendrite-free plating/stripping over 1500 h cycle (3000 cycles) at 2 mA cm-2 with nearly 100% coulombic efficiency. Meanwhile, oxygen-induced corrosion passivation are also effectively suppressed. These features bring batteries unprecedented long lifespan 40 000...

Rechargeable aqueous zinc–cobalt oxide batteries with high voltage, excellent rate capability and long-cycling life.

Abstract Herein, a two‐species redox reaction of Co(II)/Co(III) and Fe(II)/Fe(III) incorporated in cobalt hexacyanoferrate (CoFe(CN)6) is proposed as breakthrough to achieve jointly high‐capacity high‐voltage aqueous Zn‐ion battery. The Zn/CoFe(CN) 6 battery provides highly operational voltage plateau 1.75 V (vs metallic Zn) high capacity 173.4 mAh g −1 at current density 0.3 A , taking advantage the couples. Even under extremely fast charge/discharge rate delivers sufficiently discharge...

Abstract Stretchable devices need elastic hydrogel electrolyte as an essential component, while most hydrogels will lose their stretchability after being incorporated with strong alkaline solution. This is why highly stretchable zinc–air batteries have never been reported so far. Herein, super‐stretchable, flat‐ (800% stretchable) and fiber‐shaped (500% are first developed by designing alkaline‐tolerant dual‐network electrolyte. In the electrolyte, sodium polyacrylate (PANa) chains...

The exploitation of a high-efficient, low-cost, and stable non-noble-metal-based catalyst with oxygen reduction reaction (ORR) evolution (OER) simultaneously, as air electrode material for rechargeable zinc-air battery is significantly crucial. Meanwhile, the compressible flexibility prerequisite wearable or/and portable electronics. Herein, we present strategy via single-site dispersion an Fe-Nx species on two-dimensional (2D) highly graphitic porous nitrogen-doped carbon layer to implement...

For the first time solid-state zinc ion hybrid supercapacitors based on co-polymer derived hollow carbon spheres with good flexibility have been developed.

Although both are based on Zn, Zn-air batteries and Zn-ion good at energy density power density, respectively. Here, we adopted Ar-plasma to engrave a cobalt oxide with abundant oxygen vacancies (denoted as Co3O4- x). The introduction of not only promotes its reversible Co-O ↔ Co-O-OH redox reaction but also leads reduction evolution (ORR/OER) performance (a half-wave potential 0.84 V, four-electron transfer process for ORR, 330 mV overpotential, 58 mV·dec-1 Tafel slope OER). We then...

We measure the effects of phonon confinement on Raman spectra silicon nanowires. show how previous were inconsistent with confinement, but due to intense local heating caused by laser. This is peculiar nanostructures, and would require orders magnitude more power in bulk Si. By working at very low laser powers, we identify contribution pure typical quantum wires.

Abstract Arrays of well‐aligned single‐crystal zinc oxide (ZnO) nanowires uniform diameter and length have been synthesized on a (100) silicon substrate via simple horizontal double‐tube system using chemical vapor transport condensation method. X‐ray diffraction transmission electron microscopy (TEM) characterizations showed that the as‐grown had hexagonal wurtzite structure with detectable defects <0002> growth direction. Raman spectra revealed phonon confinement effect when compared...

Well-aligned ZnO nanowire (NW) arrays with durable and reproducible p-type conductivity were synthesized on α-sapphire substrates by using N2O as a dopant source via vapor−liquid−solid growth. The nitrogen-doped NWs are single-crystalline grown predominantly along the [110] direction, in contrast to [001] direction of undoped NWs. Electrical transport measurements reveal that nondoped exhibit n-type conductivity, whereas show compensated highly resistive finally upon increasing ratio...

ZnxCd1–xS single-crystal nanoribbons of controlled composition (where 0 ≤ x 1) can be synthesized by combining laser ablation with thermal evaporation. The (see Figure) exhibit lasing emission that continuously tuned within the ranges 340–390 nm and 485–515 nm. These results suggest nanoribbon lasers pre-selected "tunable" wavelengths between 340 515 may achievable tailoring value x.

Well-aligned ZnO nanoneedle and nanorod arrays were grown on an aluminum-doped zinc oxide (AZO) buffer layer by chemical vapor deposition used as templates for making gold-coated (ZnO/Au) composite nanoarrays. The coverage of Au nanoparticles was controlled varying the concentration precursor. High led to formation ZnO/Au bundles. nanoarrays applied substrates in surface-enhanced Raman scattering (SERS) measurement. SERS enhancement factor is mainly gold morphologies Their application rapid...

Vertically aligned zinc oxide (ZnO) nanorod arrays coated with gold nanoparticles have been used in Schottky barrier solar cells. The enhance the optical absorption range of visible light due to surface plasmon resonance. In charge separations, photoexcited electrons are transferred from ZnO conduction band while donor (I−) electrolyte compensate holes left on nanoparticles. fill factors dye-free cell reach a value ∼0.50. However, after incorporation N719 sensitizing dye, open circuit...

Recently, nanoscale metal-organic frameworks (NMOFs) have started to be developed as a promising platform for bioimaging and drug delivery. On the other hand, combination therapies using multiple approaches are demonstrated achieve much enhanced efficacy. Herein, we report, first time, core-shell nanoparticles consisting of photodynamic therapeutic (PDT) agent MOF shell while simultaneously carrying chemotherapeutic effective therapy. In this work, zeolitic-imadazolate framework-8 (ZIF-8)...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Polyoxometalate-Assisted Electrochemical Method for Silicon Nanostructures Preparation: From Quantum Dots to NanowiresZhenhui Kang, Chi Him A. Tsang, Zhendong Zhang, Mingliang Ning-bew Wong, J. Antonio Zapien, Yueyue Shan, and Shuit-Tong LeeView Author Information Department of Biology Chemistry Physics Materials Science, City University Hong Kong, China, Centre Super-Diamond Advanced Films (COSDAF), P. R. China Cite this: Am. Chem. Soc....

Semiconductor‐sensitized solar cells (SSCs) are emerging as promising devices for achieving efficient and low‐cost solar‐energy conversion. The recent progress in the development of ZnO‐nanostructure‐based SSCs is reviewed here, key issues their efficiency improvement, such enhancing light harvesting increasing carrier generation, separation, collection, highlighted from aspects surface‐engineering techniques. impact other factors electrolyte counter electrodes on photovoltaic performance...

Ruthenium(II) tris(bipyridyl) cationic complex (Ru(bpy)32+) incorporated UiO-67 (Universitetet i Oslo) nanoscale metal-organic frameworks (NMOFs) with an average diameter of ∼92 nm were developed as theranostic nanoplatform for in vitro two-photon fluorescence imaging and photodynamic therapy. After incorporation into porous nanoparticles, the quantum yield, luminescence lifetime, intensity Ru(bpy)32+ guest molecules much improved owing to steric confinement effect MOF pores. Benefiting from...

We introduce a unique surface-enhanced Raman scattering (SERS) substrate, which is made of hierarchical nanoarrays comprising silicon nanowires (SiNWs) decorated with silver nanoparticles (AgNPs). SiNWs arrays were produced through chemical etching n-Si(100) wafer, while AgNPs directly grown on galvanic redox reaction without any organic contamination. Solid surface extinction spectrum revealed strong plasmon absorption in broad range (from 200 to 1000 nm) indicating that induced by the...

We report high-performance, flexible, and tailorable solid-state supercapacitors enabled by Co₃O₄@PPy nanorod bundle arrays immobilized on carbon fiber cloth (CFC).

Porous anatase TiO2 spheres with sizes ranging from 150 to 250 nm were synthesized by a rapid microwave treatment of spherical titanium glycolate precursors preformed via an ethylene glycol-mediated sol–gel process. The effects various experimental conditions on the formation and final investigated. A dye-sensitized solar cell (DSSC) assembled as-synthesized porous as photoanodes exhibits 5% energy conversion efficiency, which is almost 40% higher than that made standard commercial Degussa...

Abstract Zn‐air batteries (ZABs) offer promising commercialization perspectives for stretchable and wearable electronic devices as they are environment‐friendly have high theoretical energy density. However, current suffer from limited efficiency durability because of the sluggish oxygen reduction evolution reactions kinetics in air cathode well degenerative stretchability solid‐state electrolytes under highly alkaline conditions. Herein, excellent bifunctional catalytic activity cycling...

Zinc blende-structured CdTe nanoribbons (NRs) were synthesized for the first time via a two-step process. The electronic, transport, and photoconductive properties of NRs studied systematically. It was revealed that showed p-type conductivity, presented significant photoresponses to visible–NIR (400–800 nm) irradiation with high responsivity gain. contribution factors such as surface states NRs, channel length, light intensity, working bias voltage photoresponse characteristics NR...

Exchange interaction between localized magnetic moments mediated by free charge carriers is responsible for a non-monotonic dependence of the low-temperature energy band-gap in dilute semiconductors. We found that weakly doped Mn-ZnO films, increasing exchange concentration results red-shift near-band-edge emission peak at room temperature. An increase Mn widens band gap, and blue-shift prevails. can be used to tune room-temperature optical properties wide-band gap semiconductor ZnO.