Materials Literature
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We performed studies of electron emission from ultrananocrystalline diamond (UNCD)-coated, ungated silicon field emitters as a function of in situ exposure to various gases during current versus voltage and current versus time measurements. The emitter arrays were fabricated by a subtractive tip fabrication process an…
Acoustic vibrational modes are derived for both zigzag and armchair nanotubes of finite length using the continuum theory and a variational solution of Donnell’s equation. Calculations of both even and odd modes of the displacement are performed. The dispersion relations are shown to vary with the length of the tube a…
This study revealed that Ga and N co-doped ZnO films show an increase of solubility limits of N concentration through heavy doping with Ga; this is the “ co-doping effect ” proposed by Yamamoto and Yoshida [Jpn. J. Appl. Phys. Part 2 38 (1999) L166]. The N concentration increased linearly from 10 18 to 10 19 cm -3 whe…
Der langlebige ladungsgetrennte Zustand in SWNT.−Fc.+ entsteht als Folge eines photoinduzierten Elektronentransfers im neuartigen einwandigen Kohlenstoffnanoröhren-Ferrocen-Hybrid SWNTFc (siehe Bild). Das Vorliegen von SWNT.− wurde durch Laser-Flashpyrolyse entdeckt und durch zeitauflösende Pulsradiolyse sowie Stead…
Liquid crystals used in electronic displays usually contain small amounts of ions that move under the influence of the varying applied electric field. It is well known that the motion of ions perpendicular to the substrates may lead to modified electric fields resulting in image sticking effects. During operation, the…
We present photoelectron (PE) and x-ray absorption spectra (XAS) of macroscopically aligned multiwalled carbon nanotubes. We identify the peaks in the valence PE spectra with regions of high density of states through comparison to calculations for graphite. Finally, we outline and illustrate a simple method for using…
The anisotropy of liquid absorption is influenced by the fiber orientation distribution in the fabric plane. A unique theoretical analysis of planar fluid transport using D’Arcy’s law with two-dimensional directional permeability in nonwoven structures is presented which takes into account the fiber orientation distri…
Abstract Dimethyldioctadecylammonium salts of reduced polyoxomolybdates in the organic solvent are gradually oxidized to provide bis(dimethyldioctadecylammonium) hexamolybdate, the crystal structure of which affords a molecular model for Langmuir–Blodgett films.
Electromigration occurs when a high current density drives atomic motion from the cathode to the anode end of a conductor, such as a metal interconnect line in an integrated circuit. While electromigration eventually causes macroscopic damage, in the form of voids and hillocks, the earliest stage of the process when t…
Growth of Single Crystals of High-Curie-Temperature Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 Ternary Systems near Morphotropic Phase Boundary, Hosono, Yasuharu, Yamashita, Yohachi, Sakamoto, Hideya, Ichinose, Noboru
We present a simple technique for the calibration, prediction, and optimization of the optical modulation properties of a liquid-crystal display (LCD). The method is useful when there is no information about the internal fabrication parameters of the device (the orientation of liquid-crystal molecules, the twist angle…
We have investigated nonalloyed Al/Pt ohmic contacts on n-type ZnO:Al (nd=2.0×1018 cm−3). It is shown that the as-deposited Al/Pt contacts produce a specific contact resistivity of 1.2×10−5 Ω cm2. Auger electron spectroscopy and x-ray photoelectron spectroscopy depth profile results show interdiffusion between oxygen…
Nanostructured graphitelike carbon films are prepared through a simple pyrolysis method. The as-prepared films are superhydrophobic for not only pure water but also corrosive liquids, such as acidic and basic solutions. The picture shows water droplets with pH values of 1.07 (left) and 13.76 (right) in contact with a…
A combined hot filament/direct current (dc) plasma approach to chemical vapor deposition of carbon nanofibers (CNFs) using an acetylene/ammonia feedstock has been explored. As a part of the study, the impact of filament usage and substrate holder design has been examined by scanning electron microscopy imaging of depo…
A mixed-valence polyoxomolybdate cluster [H2MoVI12MoV4O52]10− was isolated by a new “shrink-wrapping” approach to trap clusters that display low symmetry and nonspherical topology (see scheme; HMTAH=protonated hexamethylenetetraamine). The unprecedented cluster topology results from the restriction of the reorganizati…
Kontrollierte Formgebung: Eindimensionales mesostrukturiertes Siliciumdioxid wird mithilfe von Aluminiumoxidmembranen aufgebaut. Die Benetzungseigenschaften der porösen Aluminiumoxidschicht sind dabei entscheidend für die gezielte Herstellung von Nanofasern und Nanoröhren; die Konzentration eines Tensides bestimmt die…
Taking control: One-dimensional mesostructured silica materials and their arrays are prepared in anodic alumina membranes. By adjusting the wettability of the alumina pore wall, nanofibers and nanotubes are prepared in a controlled way. The mesostructured silica morphology (see picture) can be adjusted by changing the…
A long-lived charge-separated state, SWNT.−–Fc.+, is formed by photoinduced electron transfer in a novel single-wall carbon nanotube–ferrocene (SWNT–Fc) nanohybrid. The presence of SWNT.−, detected by laser flash photolysis, was confirmed by time-resolved pulse radiolysis and steady-state bulk electrolysis.
The effects of processing conditions and crystallographic orientation of growing dendrites on stray grain formation have been investigated in welds of single crystal Ni-base superalloys. The degree of constitutional supercooling (CS) at the solidification front has been used as a metric to quantify the effects. Numeri…
Eine bequeme Art der Energiespeicherung sind Lithium-Batterien, allerdings sind ihre Anoden aus natürlichem Graphit nicht vereinbar mit Elektrolyten auf Carbonat-Basis. Die Randflächen werden vom Elektrolyt angegriffen, wohingegen die Basisflächen inert bleiben. Durch Anwendung einer neuen Technik erhält man sphärisch…