Materials Literature
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Nanocrystalline diamond films have been deposited on silicon nitride substrates by hot filament chemical vapor deposition. Gas mixtures of CH4–H2–Ar were used with variation of the Ar∕H2 ratio in order to study the influence of the Ar content on the formation of nondiamond phases at the grain boundaries and thus in th…
Honeycomblike network of vertically aligned AlN nanoplatelets was synthesized on etched Si substrate via a simple vapor phase method without catalyst. The nanoplatelets are hexagonal wurtzite AlN and their thickness is 10–100nm. Field emission (FE) measurements showed that this nanostructure has a low turn-on field of…
Thin films of scandium oxide were epitaxially deposited on GaN via molecular beam epitaxy using elemental Sc and an oxygen plasma. After growth, the Sc2O3 films were annealed at a temperature of 800°C for 5min in the growth chamber. The structural quality of Sc2O3 films, before and after annealing, was characterized u…
The results pertaining to luminescence enhancement due to high-temperature amalgamation of nanometer-sized silica powder and the oxide mixture of calcium, zinc, titanium, and praseodymium are presented. The (Ca,Zn)TiO3:Pr3+ phosphor showed an intense and narrow band emission at ∼614nm under ambient light/ultraviolet e…
The electronic transport properties of Cs-encapsulated single-walled carbon nanotubes (Cs@SWNTs), which are created by a plasma ion irradiation method, are experimentally investigated at both room and low temperatures by fabricating field-effect transistor devices with these modified SWNTs. It is found that Cs@SWNTs e…
The authors report surface charge retention and enhanced ferroelectric polarization effect on ferroelectric thin films by Kelvin probe force microscope (KFM). Since high electric field is induced at scanning probe microscope tip during domain switching and the sign of surface charge induced by this high electric field…
Abstract Ruthenium nanoparticles have been prepared by hydrogenation of the complex Ru(COD)(COT) (COD = 1,5‐cyclooctadiene, COT = 1,3,5‐cyclooctatriene) in the presence of i) heavily fluorinated solid compounds as stabilizers ( para ‐bis(perfluorooctyl)benzene, 2,4,6‐tris(perfluorooctyl)aniline, and the non‐functional…
The suspense of dispersion! Nanoparticle clusters with a hydrolyzable interparticle barrier have been synthesized. These clusters are able to disperse into a stable colloid at a rate dependent upon the pH of the surrounding solution (see figure). This method could enable novel applications for colloidal clusters paire…
Electronic transport properties of Cs-encapsulated double-walled carbon nanotubes (DWNTs) synthesized via a plasma irradiation method are investigated by fabricating them as field-effect transistor devices. The authors’ results indicate that Cs-encapsulated DWNTs exhibit a high performance n-type characteristic in con…
An electron emitter composed of discontinuous gold-carbon compound conducting film on etched porous aluminum oxide (PAO) layer is proposed in this letter. The PAO layer is located between two 30μm spaced cathode and grid electrode, and is etched in diluted phosphoric acid to introduce roughness on the soda lime glass…
Heteroepitaxy of strained Mg0.37Zn0.63O layers on ZnO (0001) substrates introduces a transition from two-dimensional to Stranski-Krastanov growth accompanying lattice relaxation at a critical thickness, as indicated by the nanodots formation on the growing planar layer. Due to differences in the atomic size of Mg and…
ZnTe and Cr doped ZnTe crystals have been synthesized using a solvothermal process. The characterizations by x-ray diffraction and transmission electron microscopy show that the synthesized ZnTe:Cr crystals have a cubic structure and Cr is incorporated into ZnTe. The magnetic properties of ZnTe:Cr are investigated. A…
Abstract Summary: It is well known that poly(propylene)/clay (PP/clay) nanocomposite forms an exfoliated structure when mixed with maleic anhydride‐functionalized polypropylene (MAPP). This can be easily achieved by melt processing, however, the use of functionalized chemicals like MAPP costs a lot preventing its comm…
Enhanced electroluminescence (EL) of ITO∕SiOx∕Si-nanopyramid/p-Si∕Al diode is investigated. By using low-power plasma enhanced chemical vapor deposition at high substrate temperature, anomalous (100)-oriented Si nanopyramids with a surface density of 1.6×1010cm−2 are synthesized at SiOx∕Si interface prior to grow Si-r…
The 90° domain switching in single crystalline BaTiO3 under an external static electric field has been investigated by in situ transmission electron microscopy using a special homemade transmission electron microscope stage. With the initial domains gradually disappearing, new domains that are 90° away from the initia…
The authors have found that the directionality of the orbital populated following core-level x-ray absorption of a hexagonal nanostructure has a strong influence on the resulting optical luminescence yield spectra. For ZnO, there is an enhancement of the band gap exciton luminescence following O 1s to 2pz relative to…
Thermoelastic martensitic transformation from a face-centered-cubic austenite phase to tetragonal martensite phase has been established in a new ternary ferromagnetic alloy system Ni–Fe–Al (“prepared” in different states of site disorder) based on the results of a detailed neutron diffraction, electrical resistivity,…
A general route to patterning crystal growth is described. Structured polymer templates are employed as substrates on which to support crystal growth, resulting in translation of the polymer-film pattern into the crystal nucleation face (see figure). Continued crystal growth results in the formation of polymer–inorgan…
A comprehensive study of the mechanisms of heating and cooling originated by an electrical current in semiconductor devices is reported. The authors studied the Peltier, Joule, and Thomson phenomena self-consistently and found that the magnitudes of all of them were commensurable. A new formulation and interpretation…
Scanning transmission x-ray microscopy (STXM) has been used to study isolated carbon nanotubes for the first time. STXM and transmission electron microscopy were applied to the same type of nanotubes, providing unique information about their composition, and electronic and structural properties. The carbon 1s near-edg…