Materials Literature
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We report the synthesis and chemical, structural, and transport properties characterization of Ba8Ga16SixGe30−x type I clathrates with similar Ga-to-group IV element ratios but with increasing Si substitution (4<x<14). Substitution of 20 at. % Si within the Ga-Ge lattice framework of the type I clathrate…
The adsorption of adenine, thymine, and their radicals on the surfaces of metallic and semiconducting single-wall carbon nanotubes are studied by local density approximation within density functional theory. The energies and equilibrium distances for several configurations are obtained after relaxation of the entire s…
Peroxide-cross-linked ethylene−propylene−(diene) rubbers, EP(D)M, have complex network structures with various types of chemical cross-links as well as both temporary and trapped chain entanglements. To obtain a detailed picture of the respective contributions of these different types of cross-links and entanglements…
The magnetization of single-molecule magnets (SMMs) in non-crystalline materials is probed using high-sensitivity magneto-optical techniques. The environment strongly influences the magnetic properties and dramatically changes the spin dynamics. Comparison between different materials indicates the phonon bath as a pos…
Perovskite-type rare-earth manganites $R\mathrm{Mn}{\mathrm{O}}_{3}$ ($R=\mathrm{Tb}$ and Dy) undergo the ferroelectric transitions concomitantly with the collinear to noncollinear magnetic transitions of Mn $3d$ spins, in which the electric polarization direction can be controlled by an external magnetic field. To cl…
We use time-resolved x-ray photon correlation spectroscopy to investigate the slow dynamics of colloidal gels made of moderately attractive carbon black particles. We show that the slow dynamics is temporally heterogeneous and quantify its fluctuations by measuring the variance chi of the instantaneous intensity corre…
A novel assembly technique is used to construct organized single-walled carbon nanotube (SWNT) networks. The assembly mechanisms are studied and the electrical and structural characterization of the fabricated micro- and nanoscale SWNT structures (see image) are performed. This approach is simple, scalable, and compat…
Through the tight-binding calculation, we demonstrate that magnetic and quantum confinements have a great influence on the low-energy band structures of one-dimensional (1D) armchair graphene ribbons. The magnetic field first changes 1D parabolic bands into the Hall-edge states which originate in the Landau wavefuncti…
The blending of carbon nanotubes (CNTs) into polymer matrices leads to intrinsically nonequilibrium materials whose properties can depend strongly on flow history. We have constructed a rheodielectric spectrometer that allows for the simultaneous in situ measurement of both the electrical conductivity $\ensuremath{\si…
We fabricated ${\mathrm{Fe}}_{3\ensuremath{-}x}{M}_{x}{\mathrm{O}}_{4}$ $(M=\mathrm{Mn},\mathrm{Zn})$ thin film by pulsed laser deposition technique and investigated their electronic structure by hard x-ray photoemission spectroscopy (HX-PES) and x-ray magnetic circular dichroism (XMCD). HX-PES and XMCD revealed that…
We have investigated the ultrafast spin and charge dynamics in the course of a photoinduced phase transition from an insulator with short-range charge order and orbital order (OO) to a ferromagnetic metal in perovskite-type Gd0.55Sr0.45MnO3. Transient reflectivity changes suggest that the metallic state is formed just…
The synthesis and liquid crystalline behavior of peptide nanowire is presented. An aromatic dipeptide rapidly assembles into robust one-dimensional nanowires having a large aspect ratio in a volatile organic solvent. The stable dispersion of rigid nanowires shows a colloidal nematic liquid crystalline phase over a bro…
By introducing different long rigid ligands into polyoxometalate (POM) systems, four novel inorganic–organic hybrids containing multitrack Cu−N coordination polymeric chain-modified POMs, {[Cu(4,4′-bipy)] 3 [HGeMo 12 O 40 ]}·0.5H 2 O ( 1 ), [Cu(4,4′-bipy)]{[Cu(4,4′-bipy)] 2 [W 6 O 19 ]}·4H 2 O ( 2 ) (bipy = bipyridine…
We studied the influence of silver nanoparticles (NPs) in the luminescence properties of TeO2–PbO–GeO2 glass doped with trivalent praseodymium (Pr3+) ions. The experiments were performed with samples containing different concentrations of NPs controlled by heat treatment of the glass. The enhancement of the Stokes lum…
The hybrid diamond-graphite nanowires with lengths up to a few hundred nanometers have been identified as structural units in UNCD films synthesized by chemical vapor deposition with nitrogen gas added. This hybrid material consist of a single crystalline diamond core of 5–6 nm in diameter oriented along the [110] pri…
One-dimensional (1D) Cu(OH) 2 nanowires are converted into to two-dimensional (2D) CuO nanoleaves on a large scale, in which hierarchical-oriented attachment is involved. The whole transition process is captured and studied with the assistance of transmission electron microscopy (TEM) and high-resolution TEM images. P…
By a stepwise growth process, an axial-fan-like and high-nuclearity [Gd 6 Cu 12 ] cluster compound ( 1 ) was obtained, in which six [Cu 2 ] blade fragments encapsulate a “hollow” [Gd 6 (μ 3 -OH) 8 ] octahedral core. Without the support of a centered μ 6 -O ligand for the octahedral core, its mean Gd−μ 3 -O−Gd bridging…
We recently demonstrated a new process for the formation of partially spherical structures as an omnidirectional antireflection coating (omni-AR). In this paper, we report the simulation results of the angular and spectral dependences of the total reflectivity on various microstructured surfaces based on the rigorous…
TiFe x Co 1 − x Sb half-Heusler materials with randomly distributed TiO2 particles have been synthesized by arc melting and annealing. Thermoelectric properties were measured in the temperature range of ∼300–850 K. TiCoSb shows n-type conduction, while TiFexCo1−xSb transfers to p-type conduction when x≥0.01. The elect…
We show both gas pressure and species sensing capabilities based on the electrothermal effect of a multiwalled carbon nanotube (MWCNT). Upon exposure to gaseous environments, the resistance of a heated MWCNT is found to change following the conductive heat-transfer variances of gas molecules. To realize this mechanism…