Materials Literature
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We report on the formation of good Pt Schottky contacts on the Zn-terminated n-type ZnO (0001) surfaces (∼2×1017cm−3) using surface treatment with a hydrogen peroxide solution. The Pt contacts on organic solvent-cleaned ZnO (0001) show leaky behavior with a high leakage current of ∼−0.05A under −5V reverse bias voltag…
Single-dot luminescence spectroscopy was used to study the emission linewidth of individual silicon nanocrystals from low temperatures up to room temperature. The results show a continuous line narrowing towards lower temperatures with a linewidth as sharp as 2 meV at 35 K. This value, clearly below the thermal broade…
X-ray diffraction experiments were performed on MnO confined in mesoporous silica SBA-15 and MCM-41 matrices with different channel diameters. The measured patterns were analyzed by profile analysis and compared to numerical simulations of the diffraction from confined nanoparticles. From the lineshape and the specifi…
We demonstrate that high transmission through sharp bends in photonic crystal waveguides can be described by a simple model of the Fano resonance where the waveguide bend plays a role of a specific localized defect. We derive effective discrete equations for two types of the waveguide bends in two-dimensional photonic…
We investigate excitonic polaron states comprising a local exciton and phonons in the longitudinal optical (LO) mode by solving the Schrödinger equation. We derive an exact expression for the ground state (GS), which includes multi-phonon components with coefficients satisfying the Huang-Rhys factors. The recombinatio…
A model describing the asymmetric giant magnetoimpedance (GMI) in field-annealed amorphous ribbons is proposed. It is assumed that the ribbon consists of an inner amorphous core and surface hard magnetic crystalline layers. The model is based on a simultaneous solution of linearizied Maxwell equations and Landau-Lifsh…
Results are presented of studying the stochastic resonance (SR) in conductors with bcc lattice and narrow conduction band. In such materials, SR has a feature, namely, the weak-signal gain as a function of the additive and non-correlated noise level can have two maxima, i.e., double SR takes place.
A novel type of ruthenium oxide (RuO(2))-modified multi-walled carbon nanotube (MWNT) nanocomposite electrode (RuO(2)/MWNT) for supercapacitors has been prepared. The nanocomposites were formed by depositing Ru by magnetic-sputtering in an Ar/O(2) atmosphere onto MWNTs, which were synthesized on Ta plates by chemical…
We report the first observation of third-harmonic signals from individual gold colloids down to 40 nm diameter. Excited with 1-ps pulses at 1500 nm, the colloids generate 500-nm light, close to the plasmon resonance. The third-harmonic intensity varies as the square of the colloid surface area. Although weak, the thir…
Halloysite, a naturally occurring, 50-nm-diameter tubular material, has been utilized as a new biomineralization nanoreactor to form urease-catalyzed CaCO3. The CaCO3 synthesis occurs exclusively inside the halloysite nanotubes, with no carbonate found on the outer surface of the nanotubes or in solution. Precipitated…
Monte Carlo simulations have been performed, aimed at finding a critical fractional volume (CFV) associated with the onset of percolation for randomly oriented nanotubes (or, indeed, any conductive particles with large aspect ratios) that are randomly dispersed in a low thermo- or electroconductive medium. The nanotub…
The initial stages of etching the monoclinic (I) and the orthorhombic (II) polymorphs of paracetamol crystals by a series of agents (10%-solutions of acetic anhydride, pyridine, 1,4dioxane, morpholine, N-methylmorpholine in carbon tetrachloride) were studied and the corresponding etching patterns were compared. For th…
We propose a quantitative model of electronic transport on the basis of a conductivity characterization of diamond-based sensors exposed to $\ensuremath{\beta}$ radiation. Some of the investigated samples have been irradiated with neutron up to a fluence of $2\ifmmode\times\else\texttimes\fi{}{10}^{15}∕{\mathrm{cm}}^{…
Ultraviolet and x-ray excited luminescence of fluorescein and rhodamine-6G doped sol-gel glasses were studied at room temperature with the aim of characterizing and understanding the scintillation performance of such materials. Fast energy transfer from the glass host to the dye luminescent centers was found. While th…
The magnetic behaviour of the even-electron [Ni16Pd16(CO)40]4- cluster, in its [NnBu4]+ salt, has been investigated by magnetometry and muon spin rotation/relaxation (muSR) spectroscopy. The susceptibility measurements show an exceptionally high magnetic moment corresponding to a total spin value J=2. This suggests a…
We demonstrated the fabrication of electrically anisotropic thin films of alternating polymeric layers and metallic layers in nanometer thickness by utilizing self-assembled nanodomains of symmetric diblock copolymers. Nanometer-thick metal layers macroscopically parallel to the film plane were synthesized by electrol…
Intermolecular interactions between fluorene groups of propargylallenes define the solid state photochromic response of these materials. Examination of crystal structures of both photoresponsive and nonresponsive forms (including solvates) indicates that all compounds that are photochromic in the solid state exhibit d…
The frequency response of a carbon nanotube field effect transistor (CNFET) biased in the common-source and common-gate configurations has been measured up to 200 MHz for the first time using a direct measurement technique. In this frequency range there is no observed degradation in the measured AC response of the CNF…
Vastmanlandite-(Ce), ideally (Ce,La) 3 CaAl 2 Mg 2 [Si 2 O 7 ][SiO 4 ] 3 F(OH) 2 , is a new mineral species from the Vastmanland county, Bergslagen region, Sweden. Together with more Fe-rich, F-poor members, it forms solid solutions that are important for lanthanide sequestration in the Bastnas-type skarn deposits in…
The micrometer-scale self-assembly behaviour of MCM-41-type mesostructured silica is revealed through the study of a family of vesicular mesostructured silica with topology genus from 1 to 0 (see Figure and inside cover). The topological transformation and assembly kinetics demonstrate that the formation of the vesicu…