Materials Literature
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The ability to tune the thermal resistance of carbon nanotube mechanical supports from insulating to conducting could permit the next generation of thermal management devices. Here, we demonstrate fabrication techniques for carbon nanotube supports that realize either weak or strong thermal coupling, selectively. Dire…
An experimental microkinetic approach of the catalytic oxidation of diesel soots is developed considering mechanical mixtures of ceria and soot (ceria/soot weight ratio R ) to mimic the situation of a catalyst-coated filter. Three ceria/soot mixtures denoted as TC- R = 10, TC- R = 1, and LC- R = 10 have been prepared…
Stable field emission currents and low fluctuations are important feasibility requirements for the application of materials in field emission devices and displays. The current stability and current fluctuations of field emitted electrons from graphene films are investigated for the periods of 24 and 100 h. The graphen…
Strongly luminescent and highly loaded CdSe quantum dot (QD)−silica composite films are prepared by a simple one-step method. QDs are grown in situ as the silica matrix forms from spin-on-glass organosiloxane polymers. The nucleation and growth of QDs in the silica matrix is directly observed using TEM. The QD composi…
We present a detailed study of the (110) surface of the $\ensuremath{\gamma}{\text{-Al}}_{4}{\text{Cu}}_{9}$ crystal using both experimental methods and first-principles calculations based on density-functional theory. Our experimental approach, using low-energy electron diffraction, scanning tunneling microscopy (STM…
The present study is dedicated to an experimental microkinetic approach of the catalyst oxidation of the diesel soot using a filter coated with ceria. To mimic the situation encountered in this process, mechanical ceria/soot mixtures have been prepared according to the tight and loose contact concepts described in the…
The kinetics of photoinduced variations in surface profile in chalcogenide glass films under illumination is described. It is demonstrated that the competition between the stress-induced atomic flux (toward irradiated regions of the film) and the diffusion flux induced by an increase in the bulk energy due to broken b…
In order to better understand when man-made structures may be considered as metamaterials with effective properties at optical frequencies, we study the scattering (reflection, transmission) of light at a single interface between a uniform half-space and a bulk metamaterial, i.e., a semi-infinite three-dimensional per…
Computational and experimental investigations of angle-dependent light transmission through nanometric cross-shaped aperture arrays in thin metal films are presented. It is shown that high-transmission associated with the excitation of localized surface plasmons within the apertures can be tailored to exhibit polariza…
The authors report on the high current density n-ZnO/p-Si heterojunction diode that has been fabricated by atomic layer deposition (ALD) of 70 nm thin ZnO on a p-Si substrate. While the diode was formed at four different ALD temperatures of 80, 100, 150 and 200 °C, the 100 °C processed diode showed an optimal behaviou…
We present a method to separately tune the multiphoton absorption (MPA) and multiphoton excited photoluminescence using semiconductor core/enlarged-shell quantum dots (QDs), where the enlarged shell greatly enhances the MPA cross-sections while varying the core size facilitates emission wavelength selectivity. Followi…
Powders of isolated and well-dispersed oxide nanocubes are promising components for photoelectronic applications that benefit from tunable optical properties, surface reactivity and the ease of realization of their controlled assembly. Here, we demonstrate that combustion of zinc and magnesium metal vapors at reduced…
By hybrid density functional theory, we have investigated anisotropies in the electronic, optical, and mechanical properties of the body centered tetragonal C4 phase of carbon. We predict a strong electronic anisotropy associated with the in-plane carbon-carbon covalent bonds and the zigzag carbon chains along the c-d…
Carpet cloaking is proposed to hide an object on a dielectric half-space from electromagnetic (EM) detection. A two-dimensional conformal transformation specified by an analytic function is utilized for the design. Only one nonsingular material parameter distribution suffices for the characterization. The cloaking cov…
We present here a structure with just a single slit covering the planar anisotropic metamaterial. The metamaterial has hyperbolic dispersion and can be realized using metal-dielectric multilayers. The structure combines the focusing performance of the zone plates and subwavelength resolution of the anisotropic metamat…
Recent experiments have measured exchange bias in ferromagnetic/${\text{BiFeO}}_{3}$ systems. Bias strength scales with the length of $109\ifmmode^\circ\else\textdegree\fi{}$ ferroelectric domain walls in the multiferroic ${\text{BiFeO}}_{3}$ and only a small training effect is observed. In this paper these unusual be…
Hollow ZnO microspheres were prepared using poly(methyl methacrylate) (PMMA) as a template with the assistance of supercritical CO 2 -ethanol solution. A precursor solution of zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) was dissolved in supercritical CO 2 /ethanol mixtures and was impregnated on the surface of the PMMA templat…
With an ever increasing interest in the combined functionality and versatility of materials, increasing demands are placed on synthetic methodologies by which to produce such materials. This work demonstrates the preparation of block copolymers having fluorocarbon content, pyrrolidinone units, and alkene groups as com…
The electronic properties of low-κ interlayer dielectric and etch stop layers are important issues in ultralarge scale integrated circuits development. Leakage currents are critical problems that are not well understood. A topic of current interest is ultraviolet curing of these films. We report on electron spin reson…
Pt(II) and Pt(IV) porphyrin pincer complexes were synthesized and characterized. Their structures and electronic properties were influenced by the valence state of platinum at the outer coordination site. The considerable distortion in the porphyrin core of the Pt(II) complex was relieved in the Pt(IV) complex, due to…