Large-area, well-aligned ZnO/ZnSe core/shell nanowire arrays are synthesized directly on a transparent conducting oxide substrate. HRTEM reveals that ZnO and ZnSe have wurtzite zinc blend crystal structures, respectively (see figure), the interface is smooth with no transitional layer, grows epitaxially core. Supporting information for this article available WWW under http://www.wiley-vch.de/contents/jc_2089/2008/adma200800145_s.pdf or from author. Please note: The publisher not responsible...

A high-performance broad band UV/visible photodetector has been successfully fabricated on a fully wide bandgap ZnO/ZnS type-II heterojunction core/shell nanowire array. The device can detect photons with energies significantly smaller (2.2 eV) than the gap of ZnO (3.2 and ZnS (3.7 eV), which is mainly attributed to spatially indirect transition facilitated by abrupt interface between core shell. performance was further enhanced through piezo-phototronic effect induced lowering barrier...

Organometal–halide perovskite solar cells have greatly improved in just a few years to power conversion efficiency exceeding 20%. This technology shows unprecedented promise for terawatt-scale deployment of energy because its low-cost, solution-based processing and earth-abundant materials. We studied charge separation transport cells—which are the fundamental mechanisms device operation critical factors output—by determining junction structure across using nanoelectrical characterization...

Chemical sensors based on vertically aligned p-type CuO nanowire arrays have been fabricated by in situ micromanipulation a scanning electron microscope. The are capable of detecting air-diluted H2S to the parts per billion level. Different mechanisms proposed for detections low and high concentrated H2S. recoverable detection concentrations can be explained an oxygen adatom related process, while interface reaction model fits concentration detection, which also explains exponential sensing...

High aspect ratio cadmium sulfide (CdS) quantum rods were synthesized at room temperature in the environment of water-in-oil microemulsions using a combination two surfactants: anionic bis(2-ethylhexyl) sulfosuccinate (AOT) and zwitterionic phospholipid l-α-phosphatidylcholine (lecithin). These highly acicular particles, obtained from microemulsion containing an equimolar mixture AOT lecithin, possess average width 4.1 nm ± 0.6 nm, with lengths ranging 50 to 150 nm. In contrast, conventional...

Free-standing, monodisperse cubic BaTiO3 colloidal nanocrystals have been prepared by a hydrothermal route at temperatures as low 135 °C. Raman spectroscopy measurements and photoluminescence measured in the cube-like 20 nm strongly suggest existence of tetrragonal distortion due to an “off-center” shift Ti4+ ions within TiO6 octahedra.

A novel double light-scattering-layer ZnO (DL-ZnO) film consisting of monodisperse aggregates (MA-ZnO) as underlayer and sub-micrometer-sized platelike (SP-ZnO) overlayer was fabricated studied dye-sensitized solar-cell photoanodes. It found that DL-ZnO could significantly improve the efficiency solar cells (DSSCs) owing to its relatively high surface area enhanced light-scattering capability. The overall energy-conversion (η) 3.44% achieved by formation film, which is 47% higher than formed...

A porous magnetic hollow silica nanosphere (MHSN) is a new nanostructured drug carrier for increasing loading capability. Keeping the nanoparticles in core will limit toxicity and degradation biosystem. In this paper, we report synthesis of MHSNs by sol−gel method. CaCO3/Fe3O4 composite particles were first fabricated embedding Fe3O4 into CaCO3 using rotating packed bed (RPB) Tetraethoxysilane (TEOS) was then added as precursor to form (SiO2) layer on surface particles....

A monoclinic tungsten trioxide nanowire array has been grown on silicon substrates using powders as source materials by thermal evaporation under specific synthesis conditions (1000 °C, 13–15 Torr, 200 sccm air flow). The morphology, chemical composition and crystal structure of the as-prepared nanowires were characterized scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, transmission microscopy. identified in structure, with diameters ranging from 40 to 100 nm...

We report on the effect of humidity structural, optical, and electrical properties formamidinium lead halide perovskite (FAPbI3; prepared by a solvent engineering method) device characteristics planar FAPbI3 solar cells. The relative strongly affects film morphology, which changes from uniform, fully covered at low (e.g., ∼2%) to an inhomogeneous consisting many voids (or pinholes) high (30%–40%). This morphological deterioration with increasing is also accompanied reduction crystallinity,...

Despite the great progress that has been accomplished in supercapacitors, imbalance of development positive and negative electrode materials still remains a critical issue to achieve high energy density; therefore, exploring high-performance is highly desirable. In this article, three-dimensional cobalt phosphide (CoP) nanowire arrays were synthesized on carbon cloth utilized as binder-free supercapacitor electrode. The as-synthesized CoP presented capacitance 571.3 mF/cm2 at current density...

Organic–inorganic perovskites have emerged as an important class of next generation solar cells due to their remarkable low cost, band gap, and sub-900 nm absorption onset.

CuO has been considered a promising candidate for photoelectrochemical water splitting electrodes owing to its suitable bandgap, favorable band alignments, and earth-abundant nature. In this paper, novel gas-phase cation exchange method was developed synthesize nanorod arrays by using ZnO as the template. nanorods were fully converted with aspect ratios of 10-20 at temperature range from 350 600 °C. The as-synthesized exhibit photocurrent high 2.42 mA cm-2 0 V vs. RHE (reversible hydrogen...

Royal jelly and medical grade honey are traditionally used in treating wounds infections, although their effectiveness is often variable insufficient. To overcome limitations, we created novel amphiphiles by modifying the main reparative antimicrobial components, queen bee acid (hda) 10-hydroxyl-decanoic (hdaa), through peptide bonding with specific tripeptides. Our molecular design incorporated amphiphile targets as being biocompatible wound healing, biodegradable, non-toxic, hydrogelable,...

Room-temperature ferromagnetism is observed in reduced rutile TiO2−δ by Fe doping. The epitaxial films grown pulsed-laser deposition are carefully examined x-ray diffraction, transmission electron microscopy, and magnetic transport measurements. exhibit the extraordinary Hall-effect thin-film shape anisotropy. moments anticipated Curie temperatures of rule out particles, iron oxides, Ti–Fe oxides as possible sources for signals. carriers Fe-doped p-type, with a carrier density 1×1022/cm3....

A new hierarchically structured photovoltaic material, i.e., I-doped ZnO nanocrystalline aggregates (ZnO:I) was successfully prepared by the solvothermal method. The as-prepared ZnO:I as photoanodes of DSSCs exhibits a high overall photoconversion efficiency 4.5% due to effective capture and collection sunlight together with reduced electron−hole recombination.

We demonstrated the energy harvesting potential and piezotronic effect in vertically aligned CdSe nanowire (NW) arrays for first time. The NW were grown on a mica substrate by vapor-liquid-solid process using thin film as seed layer platinum catalyst. High-resolution transmission electron microscopy image selected area diffraction pattern indicate that NWs have wurtzite structure growth direction along (0001). Using conductive atomic force (AFM), an average output voltage of 30.7 mV maximum...

Low-cost broad-band optical limiters based on nanographene have been studied, finding optical-limiting properties superior to those of current standards, carbon fullerenes (C60) solutions and black suspensions. Further examination indicates that the presence π conjugation improves responses. Superior limiting performance is retained regardless solvent viscosity polarity, a unique feature graphene not observed in C60 black. Graphene suspensions organic solvents can work under 10 Hz laser...