Materials Literature
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The preferential penetration of a liquid metal along grain boundaries (GBs) in polycrystalline metals is a well-known phenomenon. Gallium-decorated GB networks in rolled aluminium alloys have been visualized three-dimensionally using the high-resolution synchrotron radiation computer tomography (SRCT). The distributio…
A heart of gold: The reaction of silylated arsenic derivatives with gold(I) phosphine complexes produces gold–arsenic clusters, such as [Au19(AsnPr)8(dppe)6]3+ (dppe=Ph2P(CH2)2PPh2). This complex cation (see picture; Au gold, As blue, P violet) can be described as two crossing Au9As4 chains (red and green), and contai…
Poly(vinyl alcohol) (PVA) nanofibers containing bimolecular ferritin nanoparticles exhibited the enhancement of elastic modulus as compared to pure PVA nanofibers due to chemical interactions between the ferritin and the PVA matrix. The elastic modulus of the nanofibers was measured using a three-point bending test em…
Carrier transport characteristics in the chiral nematic phase of 2-[5-(4-[(S)-2-methylbutoxy]phenyl)-3-methyl]-2′′′-propyl-2:5′-2′:5′′-2′′:5′′′-quaterthiophene, a liquid-crystalline semiconductor (see picture), are determined with a time-of-flight technique. A non-dispersive transient photocurrent is observed in the c…
Optoelectronic characterization of transparent and conducting single-wall carbon nanotube thin films is reported. By eliminating the influence of voids and bundle-bundle interactions within the effective medium theory, we show that the complex dielectric response of the individual nanotube varies with its density in t…
We fabricated metal-insulator-metal (MIM) thin film capacitors with Bi1.5Zn1.0Nb1.5O7 (BZN) dielectric films. The BZN films were deposited at room temperatures by pulsed laser deposition and annealed below 200°C which is compatible with the used polymer-based substrates. The dielectric constant of BZN films increases…
The early stage of barium titanate (BaTiO 3 ) nanoparticle formation is investigated by in situ X‐ray diffraction (XRD) and X‐ray absorption near‐edge structure (XANES) using synchrotron radiation. BaTiO 3 nanoparticles are synthesized via dissolution of barium hydroxide octahydrate and hydrolysis of titanium (IV) iso…
Abstract The synthesis, characterization, and structure regulation of hyperbranched polycarbosiloxane with dendritic boron cores were realized in this paper. First, dendritic boron core was synthesized via hydroboration with borane dimethylsulfide and bis(allyloxy)dimethylsilane. Then, the hyperbranched polycarbosilox…
One-dimensional (1D) CdSe nanostructures, including nanowires, nanotubes, nanorods, nanobelts, and even nanostructures resembling saws and tree branches, have been synthesized by sublimation of CdSe powders under various experimental conditions. These 1D CdSe nanostructures were characterized by scanning electron micr…
The onset of cracking during drying of alumina suspensions cast onto a substrate has been studied experimentally. It is shown that the capillary pressure would impose a compressive stress on the particle array and cannot itself cause cracking. Based on experimental observations, it is proposed that the driving force f…
Carbon nanotube powders were synthesized by arc discharge method and incorporated into the paste to be applied in the screen printing process. It was investigated that the field emission image uniformity was efficiently improved by laser treating carbon nanotube powders. The laser energy burned out carbon particles to…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Gunn Kim, Byoung Wook Jeong, Jisoon Ihm; Deep levels in the band gap of the carbon nanotube with…
In situ neutron diffraction was performed on Cu∕Nb nanocomposite wires composed of a multiscale Cu matrix embedding Nb nanofilaments with a diameter of 267nm and spacing of 45nm. The evolution of elastic strains and peak profiles versus applied stress evidenced the codeformation behavior with different elastic-plastic…
( La 0.7 Sr 0.3 Mn O 3 ) 0.5 : ( Zn O ) 0.5 nanocomposite thin films were deposited on c-cut sapphire substrates via pulsed laser deposition. The as-grown films were composed of fine grains of 20–50nm size. The epitaxial orientation relationships between the La0.7Sr0.3MnO3 (LSMO) and the sapphire was (111)LSMO∕∕(0003)…
Pb Ti O 3 nanowires have been successfully fabricated by a hydrothermal method at 200°C. X-ray diffraction result shows that the PbTiO3 nanowires have a tetragonal perovskite structure without any other impurity phase. Scanning electron microscopy and transmission electron microscopy investigations exhibit that the as…
Abstract Recent models of plasmon localization and local electromagnetic (EM) field distribution in silver‐on‐glass films at the percolation threshold (Shalaev and collaborators) have successfully modelled the scanning near‐field optical microscopy (SNOM) pictures. The clearly visible so‐called hot spots are believed…
ZnO nanotetrapods with hexagonal crown were synthesized on a silicon wafer by vapor transport process at a low temperature of 630°C and normal pressure without the presence of catalysts. The results demonstrated that the as-synthesized products with slender legs and regular hexagonal crown are single crystal with wurt…
Coalescence of particulates accompanied with crystal growth upon annealing at/above 200°C, found for hydrous RuO2 (RuO2∙nH2O) prepared by a sol-gel process, is effectively inhibited by the formation of RuO2∙nH2O nanocrystallites in a hydrothermal process. This thermal stability, attributable to the barrier originated…
The ferroelectric properties of 500Å thick strained, epitaxial SrTiO3 films grown on DyScO3 substrates by reactive molecular-beam epitaxy are reported. Despite the near 1% biaxial tensile strain, the x-ray rocking curve full widths at half maximum in ω are as narrow as 7arcsec (0.002°). The films show a frequency-depe…
Domain wall motion during polarization switching in ferroelectric thin films is fundamentally important and poses challenges for both experiments and modeling. We have visualized the switching of a Pb(Zr, Ti)O(3) capacitor using time-resolved x-ray microdiffraction. The structural signatures of switching include a rev…