Materials Literature
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Abstract Nanocrystalline diamond (NCD) films were deposited on microscopic glass slides using the MW PECVD method (20 Torr, 710 °C, 0.8–1% CH 4 ). After the growth period, the films were oxidized and subsequently hydrogenated, and some of them were doped with boron (NCD‐B; 3,000–30,000 ppm B:C; leading to ρ ∼ 10 –1 Ω…
High-quality CdSe quantum dots (QDs) were synthesized in a mixture of paraffin liquid and oleic acid (OA), and the effects of the synthetic conditions, including the growth temperature, precursor concentration, and initial OA:Cd molar ratio, on the optical properties of the as-prepared CdSe QDs were systematically inv…
A new reaction leading to porphyrins bearing fused rings is described. Novel N-arylquinolino[2,3,4-at]porphyrins 2 were obtained by thermal oxidative cyclization of beta-arylaminoporphyrins 1. The starting beta-arylaminoporphyrins were prepared by two routes: (i) nucleophilic displacement of the nitro group from 2-nit…
Superhydrophobic surfaces with high reflectivity might provide a promising self-cleaning approach in a wide variety of optical applications ranging from traffic to solar energy industries. However, the contradiction between the hierarchical micronanostructure and the high reflectivity is a challenge for superhydrophob…
Newly prepared CdTe quantum dots ( QD) bearing shells of water solubility providing capping agents (i.e., thioglycolic acid ( TGA) and 2-(dimethylamino)ethanethiol hydrochloride (DMAET) were subjected to electrostatic assays with several proteins (i.e., cytochrome c (cyt c) and human serum albumin (HSA). In particular…
Colloidal InAs quantum wires having diameters in the range of 5-57 nm and narrow diameter distributions are grown from Bi nanoparticles by the solution-liquid-solid (SLS) mechanism. The diameter dependence of the effective band gaps (DeltaE(g)s) in the wires is determined from photoluminescence spectra and compared to…
First-principles-based effective Hamiltonians are combined with nonequilibrium molecular dynamics to determine the electric-field-induced change in temperature in ferroelectrics. As a result, (i) the applied field can be ac in nature with a wide frequency range, (ii) bulks and nanostructures (with homogeneous or highl…
The definition of edge stress is introduced in order to quantify the energy cost to deform a pre-existing edge in a two-dimensional crystal. Using density-functional ab initio calculations, edge stresses, as well as edge energies, are determined for the armchair and zigzag edges in graphene. It is found that both edge…
A new class of benzimidazole-substituted 8-hydroxyquinoline ligands has been prepared that contain a monoanionic tridentate N,N,O-coordinating unit. These ligands form charge-neutral lanthanide complexes of the type [Ln(L-R) 3]. nH 2O or [Ln 2(L2) 3]. nH 2O ( n = 1-3) with early lanthanides from La (III) to Gd (III) i…
We study the distribution of vacuum polarization charge induced by a Coulomb impurity in massive graphene. By analytically computing the polarization function, we show that the charge density is distributed in space in a nontrivial fashion and on a characteristic length-scale set by the effective Compton wavelength. T…
Cuprous oxide (Cu 2 O) with controlled morphology was synthesized via a hydrothermal method by reducing copper nitrate with formic acid. Reactant concentration, reaction temperature, and time show strong effects on the phase formation and morphology of the products. The products were characterized by X-ray power diffr…
An irreversible structural transformation from the cubic phase to a hexagonal high-pressure phase was verified in ${\text{Gd}}_{2}{\text{O}}_{3}$ between 7.0 and 15 GPa. The compressibility and bond distances of both phases were determined by the refinement of the x-ray diffraction data. The high-pressure phase of ${\…
A straightforward experimental procedure was developed for the synthesis of highly crystalline InSb quantum dots (QDs). Spherical QDs were obtained via transsilyation of In(O2CCH3)3 with tris(trimethylsilyl)-antimony in the presence of coordinating ligands.
Using a large polymer chain cluster, we have examined entanglement densities of the polymer chains in the bulk and in the surface by molecular dynamics simulation. The entanglement density was measured by the interchain contact fraction (ICF), which was developed as a structural parameter of the entanglement. It was f…
A database with details of the geometry of metal sites in proteins has been set up. The data are derived from metalloprotein structures that are in the Protein Data Bank [PDB; Berman, Henrick, Nakamura & Markley (2006). Nucleic Acids Res. 35 , D301–D303] and have been determined at 2.5 Å resolution or better. The…
Silver nanocrystals with tetrahedral shapes and {111} faces have been synthesized by the light-driven growth method in an aqueous solution. The nanocrystals of T(d) symmetry were formed under the effect of tartrate and citrate as the structural-directing reagents at the appropriate stages of reaction. Further, the nan…
Ultralow thermal conductivity ($1.1\text{ }\text{ }\mathrm{W}/\mathrm{m}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{K}$, $1000\text{ }\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$) in anion-deficient ${\mathrm{Ba}}_{2}R{\mathrm{AlO}}_{5}$ ($R=\mathrm{Dy}$, Er, Yb) compounds was reported. The low thermal conduct…
The dependences of the maximum and the half-width of near band-edge photoluminescence of semi-insulating undoped GaAs crystals at 77K on the concentration of background acceptor impurities and the level of excitation in the range from 3x1021 to 6x1022 quantum/(cm2/s) are investigated. The observed dependences are expl…
We present a set of criteria to optimize photodetectors based on n-type metal oxide nanowires and a comparison methodology capable of overcoming the present lack of systematic studies dealing with such devices. The response of photoconductors is enhanced following different fabrication strategies, such as diminishing…
We examine an intrinsic graphene connected to the phonon thermostat at temperature T under irradiation of thermal photons with temperature T_r, other than T. The distribution of nonequilibrium electron-hole pairs was obtained for the cases of low and high concentration of carriers. For the case when the interparticle…