Materials Literature
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The adsorption states and growth process of the first water (D2O) layer on Rh(111) were investigated using infrared reflection absorption spectroscopy, temperature programed desorption, and spot-profile-analysis low energy electron diffraction. Water molecules wet the Rh(111) surface intact. At the early stage of firs…
Field electron emission properties of individual diamond cone were investigated using a customized double-probe scanning electron microscope system. The diamond cone was formed by maskless ion sputtering process in bias-assisted hot filament chemical vapor deposition system. The as-formed sharp diamond cone coated wit…
Sensitive to TNT vapor: Porphyrin-doped silica films with bimodal porous structures, fabricated using a dual template approach, exhibit remarkable sensitivity towards traces of TNT vapour. These hierarchically structured nanocomposites serve as useful chemosensory materials for rapid detection of explosives (see pictu…
A lack of dependence of the Raman frequency of optical vibrational modes on excitation wavelength in polar nanosemiconductors was observed. This is in contrast to the earlier observed dependence in nonpolar nanomaterials: carbon nanotubes and Si nanowires. This difference has been ascribed to the different crystallogr…
Abstract Two Eu III mixed‐ligand complexes, namely [Eu(TTA) 3 (PBO)]and [Eu(TTA) 3 (PBT)] [TTA = 1,1,1‐trifluoro‐3‐(2‐thenoyl)acetonato, PBO = 2‐(2′‐pyridyl)‐1,3‐benzoxazole, and PBT = 2‐(2′‐pyridyl)‐1,3‐benzothiazole], have been synthesized. [Eu(TTA) 3 (PBO)] has been structurally characterized by single‐crystal X‐ra…
We have fabricated a composite thin film that exhibits intense photoactivated fluorescence of silver oxide at 522 and 529nm under the irradiation of a 488nm laser. This film consists of a silver coated polymeric periodic array on indium tin oxide glass substrate. By adjusting the column diameters and lattice constants…
The specific heat of some alkyl-cyclohexanes in their liquid, supercooled liquid, crystalline, and (for the first time) glassy states has been measured by quasiadiabatic calorimetry. Thermodynamic properties as well as the glass forming ability have been studied as a function of systematic changes of the molecular str…
In order to explore the fundamental properties of one-dimensional nanostructured high-temperature superconductors and enhance their promising applications, a universal and general method for the synthesis of high-quality YBa(2)Cu(3)O(7-δ) (YBCO) nanowire arrays is developed, which involves the combination of a novel s…
Ordered porous structures for photonic application were fabricated on p- and n-type silicon by means of masking against ion implantation with Langmuir-Blodgett (LB) films. LB films from Stöber silica spheres [J. Colloid Interface Sci. 26, 62 (1968)] of 350nm diameter were applied in the boron and phosphorus ion-implan…
Abstract Platinum nanocrystals with sizes smaller than 10 nm are obtained by H 2 ‐reduction of aqueous K 2 PtCl 6 in the presence of different concentrations of poly ( N ‐vinyl‐2‐pyrrolidone; PVP: M w ≈ 360 000) at pH = 2.5–7.0. Tetrahedral Pt nanocrystals (3–10 nm) are produced with high selectivity (73–83% by number…
β-PbF 2 single crystals doped with YbF 3 (0.2% and 2%) were studied by x-ray diffraction (XRD), electron paramagnetic resonance (EPR) and optical spectroscopy. EPR revealed the presence of only one kind of paramagnetic ion Yb 3+ , in a cubic symmetry site. The optical absorption, emission and excitation spectra enable…
Material with the phase sequence $\mathrm{Sm}A\text{\ensuremath{-}}\mathrm{Sm}AP\text{\ensuremath{-}}\mathrm{Sm}CP$ is studied as an example of a system in which the spontaneous electric polarization and the molecular tilt develop independently at the $\mathrm{Sm}A\text{\ensuremath{-}}\mathrm{Sm}AP$ and the $\mathrm{S…
The Curie temperature TC of La1−zCez(Fex−yMnySi1−x)13 is decreased by adjusting the composition, and hence the itinerant-electron metamagnetic transition is observed at 5K in La0.75Ce0.25(Fe0.850Mn0.035Si0.110)13 after zero-field cooling. As a result, the La1−zCez(FexMnySi1−x)13 compounds exhibit strong magnetocaloric…
Self-assembled thin films of gold nanoparticles of 4–5nm, prepared on glass using aliphatic dithiols of different hydrocarbon chain lengths as interparticle linker molecules, have been studied by x-ray methods and dc conductivity. X-ray data revealed small spacer-dependent cluster size variations in the films. Conduct…
Shelling out: A replica technique is demonstrated for fabricating hollow SiC nanostructures of any shape (see figure) as defined by templates of pregrown ZnO nanostructure templates. The technique is based on plasma-enhanced chemical vapour deposition (PECVD) at a temperature of ≈250–300 °C. The SiC-shell nanostructur…
In the present work, microstructural transformation of carbon nanotubes (CNTs) from the “herringbone” into highly crystalline structure in an electric field was experimentally observed by using a high-resolution transmission electron microscope and the growth mechanism was modeled and discussed by using a finite eleme…
Bi 3.15 Nd 0.85 Ti 3 O 12 thin films of two different preferred orientations were sol-gel grown on Pt∕Ti∕SiO2∕Si. Using different heating rates during crystallization, either films containing 65% columnar grains with (104)∕(014) orientation or fine-grained films with a predominant c-axis orientation were obtained. Ani…
A series of first principles calculations have been carried out to investigate structural, electronic, and optical properties of BexZn1−xTe alloys for five beryllium compositions. Our results show that the lattice constant scales linearly with beryllium composition and there is a direct-to-indirect band gap crossover…
Cobalt-doped ZnO (Co2+:ZnO) films were studied by magnetic circular dichroism (MCD) spectroscopy. A broad 300K ferromagnetic MCD signal was observed between 1.4 and 4.0eV after exposure of paramagnetic Co2+:ZnO films to zinc metal vapor, attributed to low-energy photoionization transitions originating from a spin-spli…
The authors present a charge-dipole model for the calculation of the polarization of fullerenes and carbon nanotubes. By expressing the electrostatic interactions in terms of normalized propagators, the technique achieves a better consistency and an improved stability. In its most elementary form, the model depends on…