Materials Literature
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Self-assembled Ge quantum dots were formed by in-situ thermal annealing of a thin amorphous Ge layer deposited by molecular beam epitaxy on a thin porous TiO2 layer grown on SiO2 on Si(001). For samples with dot diameters ranging from 10 to 35 nm, the dot photoluminescence (PL) appeared primarily as a wide near-infrar…
In electrochemical impedance spectroscopy which is commonly used to study the behavior of titanium and its alloy in simulated body fluid solution, high frequency artifacts are commonly observed. Two parameters that may augment the high frequency artifacts including the electrochemical cell design and the solution are…
Metal-assisted HF etching of Si has attracted considerable attention as a new electroless method that can produce porous Si by immersing metal-modified Si in a HF solution without bias. Such etching generally uses not only metal-modified Si but also an oxidizing agent. Palladium exhibits high activity in assisted etch…
Mesoporous silicate (MCM-41) and 2, 5-distyrylpyrazine photo- polymer (poly-DSP) were used as corrosion protective coatings for 304 stainless steel, copper and nickel metals. Films on metal surfaces were prepared by dip-coating and vapor deposition (CVD, PVD) methods. Poly-DSP thin films formed by vapor deposition are…
We report on a study of molecular modifications of the electronic characteristics of single-walled carbon nanotube (SWNT) field-effect transistors (FETs) through insertion of different organic self-assembled monolayers (SAMs) between the SWNT and an electrode. The changes induced by the molecular interface were elucid…
In this manuscript we are reporting on the electrodeposition of ZnO nanowires on potentiostatically and galvanostatically prepared ZnO 2D layers (called buffer layers) on glass substrates covered with transparent conductive oxide (TCO). It is shown that the buffer layer morphology and thickness could be used as parame…
We report the microfluidic chip-based assembly of colloidal silanol-functionalized silica nanoparticles using monodisperse water-in-oil droplets as templates. The nanoparticles are linked via silica bridges, thereby forming superstructures that range from doublets to porous spherical or rod-like micro-objects. Adding…
Fractal study was used to the analysis of the fractured surface of commercial N50-type Nd-Fe-B sintered magnets. The strain-stress properties of the specimens indicate that the elastic and plastic deformations occur simultaneously during intergranual cracking. The microfractography of the specimens exhibits typical br…
The aim of this study was to compare the reactivity of three lanthanum-based phases in presence of methane CH4 or carbon monoxide CO gases. The hydroxycarbonate LaOHCO3 was synthesized from a new specific precipitation route. From this hydroxycarbonate phase, the dioxycarbonate La2O2CO3 and the oxide La2O3 were prepar…
A comparative analysis of Raman spectra from poly-domain PbTiO3 thin films with poly-domain and single-domain PbTiO3 crystals is presented. Raman spectroscopy reveals that the profiles of A1-symmetry modes can be significantly modified by the existence of the domain structure. The possible origins of these complex pro…
The traditional Cu interconnect barrier/seed process consisting of PVD-Ta based barrier/Cu-seed will reach its limit between 20 nm and 30 nm wide trench dimension. To extend Cu interconnect technology further, possible solutions such as PVD-RuTa, PEALD-Ru-based, CVD-Co, PVD/CVD-self-formed-MnSixOy and self-assembled m…
A study of the dyeing behavior of male silk fibers (obtained from silk cocoons spun by male worms) was undertaken. Normal silk (composed of filaments made by male and female worms) was also dyed for comparison purposes. Physical and chemical characteristics of silk which may affect dyeing behavior were also investigat…
In order to achieve a continuous tuning of laser emission, the authors designed and fabricated three types of cholesteric liquid crystal cells with pitch gradient, a wedge cell with positive slope, a wedge cell with negative slope, and a parallel cell. The length of the cholesteric liquid crystal pitch could be elonga…
Abstract A capacitively coupled parallel‐plate reactor has been used to deposit plasma‐polymerized pyrrole (PPPy), plasma‐polymerized N,N,3,5‐tetramethylaniline (PPTMA), and plasma‐polymerized pyrrole‐N,N,3,5‐tetramethylaniline (PPPy‐PPTMA) bilayer thin films on to glass substrates at room temperature. To deposit the…
The oxidation products of NaAlH 4 were studied using solid-state nuclear magnetic resonance experiments combined with X-ray diffraction (XRD) experiments. We studied the coordination of aluminum with oxygen using single-pulse 27 Al experiments. 27 Al−{ 1 H} rotational echo double-resonance, 23 Na−{ 27 Al}/ 27 Al−{ 23…
Abstract Soil contamination by metals is a common problem encountered in many industrialized countries. In this work we present a new approach for heavy metals detection by using surface-enhanced Raman scattering (SERS) spectroscopy. Zn(II) can be clearly determined by SERS in contaminated soil by using 4-(2-pyridylaz…
The surface potential decay on low-density polyethylene (LDPE) has been studied after negative charge deposition by corona effect as a function of initial potential Vo and charging time tc. It was found that the decay rate increases with initial potential and charging time. For high charging level, cross over phenomen…
A novel immersion process was carried out to improve the electrical stability of ZnO varistors under a dc electrical field. It was performed by dipping the conventionally sintered ZnO varistor samples in a bismuth nitrate solution with a subsequent heat treatment. The results showed that this process could improve the…
Abstract Nax−yHyTi2−xFexO4·nH2O nanosheets with lepidocrocite-like layered structure were produced through alkaline hydrothermal treatment at very low temperatures (130°C) from ilmenite sand. The crystal structure, morphology and optical properties were investigated by X-Ray diffraction, transmission electron microsco…
A new Auger electron spectrometer probe designed to monitor the surface composition during growth is presented. The device is able to operate without impairing the deposition process and is compatible with the environmental constraints of deposition chambers. Auger electron excitation can be generated by the electron…