Materials Literature
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It is shown that epitaxial ZnO/(0001) sapphire films grown by pulsed laser deposition have defect-free Zn-polar nanorods protruding from a continuous O-polar underlayer containing high densities of threading dislocations (TDs). By continuing the ZnO growth hydrothermally, the nanorods grew laterally over the O-polar l…
We have determined the particle size distribution profiles of octane-terminated silicon nanoparticle suspensions, produced using the sonication of electrochemically etched Si wafers. Small-angle neutron scattering data was analyzed separately in high (0.4 nm(-1)<q<3.0 nm(-1)) and low (q<0.4 nm(-1)) scattering vector r…
Zinc oxide (ZnO) thin films were prepared under different conditions on glass substrates using a sol–gel process. The microstructure of ZnO films was investigated by means of diffraction analysis, and plan‐view and cross‐sectional scanning electron microscopy. It was found that the preparation conditions strongly affe…
The evolution of both the occupied and unoccupied states for Cs-doped copper phthalocyanine (CuPc) has been investigated with photoemission and inverse photoemission spectroscopy. As the Cs doping ratio increases, the lowest unoccupied molecular orbital (LUMO) of CuPc shifts downwards, reaching the Fermi level. After…
Abstract The morphology of polyvinylidenefluoride (PVDF) and the copolymer of tetrafluoroethylene with ethylene (CTE) were investigated by thermomechanical analysis. Both granules and highly dispersed powders of the polymers have similar morphology. Polymer granules contain amorphous and crystalline regions. The morph…
Polyimide nanofoamed films have been prepared from the polyimide precursors (PMDA-ODA) and poly(ethylene oxide) (PEO) in N,N-dimethylacetamide. The dielectric properties of the films were studied over the temperature range of −150–150°C and a frequency range of 1Hz–10MHz. The frequency dependence of the dielectric con…
Cellular polypropylene ferroelectrets were subjected to vacuum and high air pressures. The capacitance of the samples was measured as a way to monitor their thickness. It was found that both in vacuum and in high-pressure air, the thickness of the samples recovers to its original value after a sufficient storage time…
Abstract Poly(L‐lactide) (PLLA) on poly(2‐hydroxyethyl methacrylate) (PHEMA) backbone was prepared by a combination of atom transfer radical polymerization (ATRP) and ring‐opening polymerization (ROP). The structure of the comb polymer was analyzed by wide angle X‐ray diffraction (WAXD), small angle X‐ray scattering (…
The purpose of this study was to immobilize inorganic layered double hydroxides (LDHs) on the poly(methylmethacrylate) substrate as the media to extract the specific DNA molecules through fluidic system to enhance the efficiency of extract specific DNA molecules from extremely low concentration in sample solution. LDH…
Water-soluble photoluminescent (PL) silicon quantum dots (SiQDs) can be obtained by surface modification with small organic molecules, while still leaving some sites uncovered by the employed organic molecules due to steric repulsion. Using a density-functional tight-binding method, we show the possibility of fully ca…
Novel 4H structure silver nanowires (4H-AgNWs) have been reported to coexist with the usual face-centered cubic (FCC) ones. Here we report the electrical properties of these polytypic AgNWs for the first time. AgNWs with either 4H or FCC structures in the diameter range of 20-80 nm were measured in situ inside a trans…
We demonstrate a reproducible layer engineering technique for multilayer graphene through controllable oxidation via a SiO2 capping layer. The oxidation method is able to reduce the thickness of few layer graphene to a single layer, as determined by a combination of contrast and Raman spectroscopies. We have also stud…
A detailed study of the carrier absorption (CA) mechanism in multilayered silicon-nanocrystals (Si-nc) rib waveguides is reported. A pump (532nm) and probe (1535nm) technique is used to assess two loss mechanisms due to optical excitation of the system: one characterized by slow (seconds) dynamics related to heating a…
A nonconventional phase-field model is developed to predict ferroelectric domain structures. It employs a set of field variables motivated by multirank laminates to represent energy-minimizing domain configurations, giving rise to an explicit expression of the energy-well structure. The framework is applied to domain…
Abstract Advanced instrumentation at synchrotron beamlines facilitates considerable reduction of the exposure required for the recording of low‐noise small‐angle X‐ray scattering (SAXS) patterns. Concerning the monitoring of tensile tests on polymer materials by SAXS means that change‐over from the stretch‐hold techni…
The behavior of p-type conductivity in nitrogen-doped ZnO prepared by thermal oxidation of zinc oxynitride thin film was investigated. The sample exhibited a stable p-type characteristic in the darkness over a 1yr period after deposition. However, when the p-type sample was irradiated by 2.72eV photons, it underwent a…
Complex core-shell architectures are implemented within LaF3 nanoparticles to allow for a tailored degree of energy transfer (ET) between different rare earth dopants. By constraining specific dopants to individual shells, their relative distance to one another can be carefully controlled. Core-shell LaF3 nanoparticle…
Low-frequency (100Hz⩽f⩽1MHz) dielectric properties of La0.8Sr0.2MnO3∕Nb-doped SrTiO3 heterojunctions were investigated in detail at room temperature. Negative capacitance was observed at low frequencies under positive dc biases. This phenomenon was found to result from the combinational contributions from the Maxwell–…
We study the aging behavior of aqueous laponite suspension, a model soft glassy material, in creep. We observe that the viscoelastic behavior is time dependent and is strongly influenced by the deformation field; the effect is known to arise due to aging and rejuvenation. We show that irrespective of the strength of t…
We report on the effect of nanodot (ND) areal density and period on cross-plane thermal conductivity κ⊥ in SiGe∕Si nanodot superlattices (NDSLs). For all ND areal densities considered, we found that κ⊥ in SiGe∕Si NDSLs decreased monotonically with decreasing period and reached values lower than those in typical SiGe a…