Materials Literature
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A comparative study of the adsorption of an O2 molecule on pure Au(n+1)+ and doped MAu(n)+ cationic gold clusters for n = 3-7 and M = Ti, Fe is presented. The simultaneous adsorption of two oxygen atoms also was studied. This work was performed by means of first principles calculations based on norm-conserving pseudo-…
Single-crystalline cerium carbonate hydroxide (CeCO 3 OH) with shuttle morphology has been successfully synthesized by a facile hydrothermal method with the aid of polyvinyl alcohol (PVA). The typical diameters of CeCO 3 OH shuttles (middle part) are about 800 nm, and the typical lengths are about several micrometers.…
Exact solutions are obtained for all the modes of wave propagation along an anisotropic cylindrical waveguide. Closed-form expressions for the energy flow on the waveguide are also derived. For extremely anisotropic waveguide where the transverse permittivity is negative $({\ensuremath{\epsilon}}_{\ensuremath{\perp}}&…
We apply fast field cycling NMR to study the dispersion of the 1 H spin−lattice relaxation time T 1 (ω) of linear 1,4-polybutadienes with molecular weight M (g/mol) ranging from M = 355 to 817 000. By this, the crossover from glassy dynamics through Rouse to reptation becomes accessible. Analyzing the data in the susc…
Novel CdIn 2 S 4 hollow spheres with small bipyramids aggregating on their surface had been successfully synthesized via a facile hydrothermal process without any template or surfactant. The crystal structure, morphology, and optical properties of the products were characterized by X-ray diffraction, X-ray photoelectr…
Photoelectron spectroscopy and scanning tunneling microscopy have been used to investigate how the oxidation state of Ce in CeO 2− x (111) ultrathin films is influenced by the presence of Pd nanoparticles. Pd induces an increase in the concentration of Ce 3+ cations, which is interpreted as charge transfer from Pd to…
Poly( L-lysine) (PLL)/hyaluronic acid (HA) multilayers are films whose thickness increases exponentially with the number of deposition steps. Such a growth process was attributed to the diffusion, in and out of the whole film, of at least one of the polyelectrolytes constituting the film. In the case of PLL/HA, PLL is…
The electronic and magnetic properties of many strongly-correlated systems are controlled by a limited number of states, located near the Fermi level and well isolated from the rest of the spectrum. This opens a formal way for combining the methods of first-principles electronic structure calculations, based on the de…
We study the effects of octadecanethiol on the photoluminescence intensity and blinking dynamics of single CdSe nanocrystal quantum dots. The number of luminescent nanocrystals per unit area, the intensity histograms of the luminescent nanocrystals, and the single nanocrystal blinking behavior are analyzed in samples…
The low-field electron mobility in rectangular silicon nanowire (SiNW) transistors was computed using a self-consistent Poisson-Schrödinger-Monte Carlo solver. The behavior of the phonon-limited and surface-roughness-limited components of the mobility was investigated by decreasing the wire width from 30 nm to 8 nm, t…
A novel route has been developed for surfactant-free synthesis of highly fluorescent gold quantum dots (GQDs) in N, N -dimethylformamide (DMF). The as-prepared GQDs show instinctive fluorescence and good solubility in water. The formation mechanism and functionalization of GQDs were investigated by UV−vis spectra, flu…
Highly aligned electrospun micro- and nanoscale fibers and pseudowoven mats were produced via electrospinning by incorporating an auxiliary counter electrode to create an electric field of controlled geometry and magnitude. Two polymers were examined using this technique: a polyimide (CP2) and a biodegradable polymer,…
We report experimental evidence for the generation of ferroelectric polarization in an organic conductor α-[bis(ethylenedithio)tetrathiafulvalene] 2 I 3 obtained by optical second-harmonic generation. The spontaneous polarization emerges along with a metal-to-insulator transition that is driven by the Wigner crystalli…
We show that a generalized Landau theory for the smectic-A-smectic-C (Sm- A -Sm- C ) phases exhibits a biaxiality induced Sm- A -Sm- C tricritical point. Proximity to this tricritical point depends on the degree of orientational order in the system; for sufficiently large orientational order the Sm-A-Sm-C transition i…
We review how a magnetic resonance force microscope (MRFM) can be applied to perform ferromagnetic resonance (FMR) spectroscopy of \emph{individual} sub-micron size samples. We restrict our attention to a thorough study of the spin-wave eigen-modes excited in permalloy (Py) disks patterned out of the same 43.3 nm thin…
We have realized and measured a GaAs nanocavity in a slab photonic crystal based on the design by Kuramochi et al. [Appl. Phys.Lett., \textbf{88}, 041112, (2006)]. We measure a quality factor Q=700,000, which proves that ultra-high Q nanocavities are also feasible in GaAs. We show that, due to larger two-photon absorp…
Dislocation and grain-boundary melting are studied in three dimensions using the phase field crystal method. Isolated dislocations are found to melt radially outward from their core, as the localized excess elastic energy drives a power-law divergence in the melt radius. Dislocations within low angle to intermediate a…
We have studied the formation of graphene on the Si face of SiC(0001)-6H and -4H using in situ electron microscopy. By imaging the nucleation and growth of the $6\sqrt{3}$ ``buffer layer'' during annealing in vacuum we identify key factors responsible for the appearance of deep pits during graphene formation. Pits for…
We use a recently developed self-consistent GW approximation to present first principles calculations of the conduction band spin splitting in GaAs under [110] strain. The spin orbit interaction is taken into account as a perturbation to the scalar relativistic hamiltonian. These are the first calculations of conducti…
The (TiO2)n clusters and their anions for n = 1-4 have been studied with coupled cluster theory [CCSD(T)] and density functional theory (DFT). For n > 1, numerous conformations are located for both the neutral and anionic clusters, and their relative energies are calculated at both the DFT and CCSD(T) levels. The CCSD…