Materials Literature
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Amplified spontaneous emission (ASE) in single crystals of para-sexiphenyl grown in the β phase by vapor transport is demonstrated upon photoexcitation at 355nm. Excitation with femtosecond laser pulses leads to dual wavelength ASE at 427 and 450nm, while excitation with nanosecond laser pulses leads to ASE only at 45…
We investigate the bonding of H in O vacancies in ZnO using density functional calculations. We find that H is anionic and does not form multicenter bonds with Zn in this compound.Received 2 April 2007DOI:https://doi.org/10.1103/PhysRevB.75.241102©2007 American Physical Society
The light-emitting diode of p-ZnO∕n-GaAs heterojunction was grown by metal-organic chemical vapor deposition. The p-ZnO films have been formed by the doping As atoms which diffuse into ZnO film from GaAs substrate. The p-type behavior of As-doped ZnO films based on As-doped p-ZnO∕n-GaAs, p-ZnO∕p-GaAs heterojunction wa…
A poly(3,4-ethylenedioxythiopene) (PEDOT)/polyaniline (PANI) electrochromic device (ECD) was fabricated for the purpose of examining colouration efficiency (CE) as a function of charge density ingress/egress. CE is typically measured in cm2/C with the aim being to produce as large an optical density change as possible…
Zn 0.96 Mn 0.04 O and Zn0.96Mn0.04O:N thin films with wurtzite structure were grown by inductively coupled plasma enhanced chemical vapor deposition method. Although both samples exhibit ferromagnetism at room temperature, the saturation magnetic moment (1.4μB∕Mn) of the Mn- and N-codoped sample is much larger than th…
We report on new instabilities of the quasistatic equilibrium of water drops pinned by a hydrophobic inclined substrate. The contact line of a statically pinned drop exhibits three transitions of partial depinning: depinning of the advancing and receding parts of the contact line and depinning of the entire contact li…
Change and change again: Under catalytic conditions for NO/CO conversion, simultaneous time-resolved extended X-ray absorption fine structure spectroscopy and IR studies show that the rhodium atoms in 5 wt % Rh/Al2O3 rapidly migrate between CO-covered Rh particles and mononuclear Rh–NO sites depending on the changing…
Abstract This paper deals with immiscible blends of poly(ethylene terephthalate) obtained by melt blending with polycarbonate. A large survey of the current knowledge in the field of these blends is presented. Resolved and unresolved issues concerning the effect of exchange reactions on the miscibility of the componen…
An efficient exploration of the configuration space of a biopolymer is essential for its structure modeling and prediction. In this study, the authors propose a new Monte Carlo method, fragment regrowth via energy-guided sequential sampling (FRESS), which incorporates the idea of multigrid Monte Carlo into the framewo…
This work reports about the structural and magnetic properties of the quaternary Heusler alloy Co2FeAl1−xSix with varying Si concentration. The structure of the Co2FeAl1−xSix solid solution was investigated by means of x-ray diffraction and differential scanning calorimetry. It is found that the alloys exhibit the L21…
Substrate-based catalytic growth modes have been widely used to fabricate vertically aligned nanowires for most technologically relevant semiconducting systems, with CdTe being a notable exception. The catalysts that promote a one-dimensional nanoscale growth mode in other systems seem to fail, creating the need for a…
The existing controversy about the room temperature structure of multiferroic Pb(Fe1∕2Nb1∕2)O3 is settled using synchrotron powder x-ray diffraction data. Results of Rietveld refinements in the temperature range of 300–12K reveal that the structure remains monoclinic in the Cm space group down to 12K, but the lattice…
A double-surfactant-layer-assisted polymerization method was designed to prepare well-controlled core/shell metal oxide/polyaniline (c/s-MO/PANi) nanocomposites. Monodispersed and uniform core/shell nanocomposites including c/s-CuO/PANi, −Fe2O3/PANi, −In2O3/PANi and −Fe2O3/SiO2/PANi were successfully prepared using th…
Antimony-doped p-type ZnO films epitaxially grown on (0001) sapphire substrates were fabricated by pulsed laser deposition at 400–600°C in 5.0×10−2Torr oxygen without postdeposition annealing. The films grown at 600°C have among the highest reported hole concentration of 1.9×1017cm−3 for antimony doping, Hall mobility…
Hybrid vesicles: Magnetic nanoparticles (γ-Fe2O3) and quantum dots (CdSe/ZnS) can be entrapped in stable vesicles by emulsion processes. The hybrid vesicles (HVs) have distinct magnetic and fluorescence properties (see images; scale bars: 10 μm). Fluorescence detection allows magnetic manipulation and tracking of the…
V-doped ZnO films have been prepared on Si(111) substrates by direct current reactive magnetron cosputtering. Hysteresis loops of polarization–applied field characteristics with a remnant polarization of 0.2μC∕cm2 were obtained in (2.5at.%) V-doped ZnO films, indicating the ferroelectric behavior exists in this system…
Thin films of 5% Co-doped ZnO with a range of Al codoping exhibit a band-edge shift, which varies with carrier concentration as n2∕3. Carrier effective mass is 0.26me and mobility is ∼10cm2V−1s−1. The doped films, which contain coherent Co clusters of 4–8nm in size, exhibit a ferromagnetic moment of 0.3–1.0μB per coba…
Abstract In this study, flame retardancy properties of fabrics treated with phosphorous (P) doped and undoped SiO 2 thin films were developed by sol–gel technique. As to this aim, P‐doped and undoped SiO 2 film were coated on cotton fabric from the solutions prepared from P, Si‐based precursors, solvent, and chelating…
Abstract A “green” processing method, dual‐melt extrusion, was used to prepare thermoplastic starch/montmorillonite nanocomposites without organic reactions in the solution. XRD demonstrates that sorbitol enlarged the interlayer distance of MMT during the first step. MMT‐sorbitol, formamide and starch were used to obt…
The phenomenology of the laboratory glass transition is examined in the enthalpy landscape framework. It is shown that a generic description of the glassy state based on partitioning of the phase space caused by the finiteness of the time of observation explains all universal features of glass transition. Using this d…