Materials Literature
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We have demonstrated operation of an all-optical liquid crystal (spatial light modulator) used for steering a laser beam over large angles. Continuous steering over ±12.4° is achieved, controlled by the power of an infrared pump beam; This is a very large steering angle for a nonmechanical nondiffractive system.
Most carbon nanotube transistors work as Schottky barrier transistors. We show that chemical treatment of operational p-type nanotube transistors by trifluoro-acetic acid (TFA) leads to the drastic improvement of all the key device parameters. This effect is due to the highly polar nature of the TFA molecule which, on…
Epitaxial PbTiO3 thin films of various thicknesses were prepared by pulsed laser deposition on Pt(001)/MgO(001) substrates. Their ferroelectric domain structures and switching behavior were then investigated mainly using scanning force microscopy as a function of film thickness. Direct evidence of a-domain switching w…
Piezoresponse force microscopy (PFM) technique has been utilized to study the evolution of domain structure with varying Pb(Zr,Ti)O3(PZT) thickness on GaN substrate. Sol-gel PZT films were deposited on the GaN∕sapphire substrate with PZT thickness of 100, 200, and 300nm. The films exhibit ferroelectric properties that…
Abstract Summary: A series of organic‐inorganic nanoparticles were synthesized by nitroxide‐mediated polymerization (NMP) of butyl acrylate initiated by a self‐assembled monolayer of an azo initiator. The azo initiator was immobilized on silica particles in the presence of a stable nitroxide radical, SG1 (an acyclic β…
Deposition of a hydrothermal method has a number of advantages; low deposition temperature, high-purity, deposition on a three-dimensional structure, and a large thickness. The present paper investigates the improvement of an epitaxial lead zirconate titanate (PZT) thin film deposited via hydrothermal synthesis. The c…
The crystal structure of polyhedral graphite particles (“G balls”) has been investigated under pressure up to 43 GPa and at room temperature by x-ray powder diffraction measurements. The polyhedra maintain the graphite phase under pressure higher than 40 GPa. A 29% compression in volume at 43 GPa involves an unusual d…
Three new copper(II)–manganese(II) heterobinuclear complexes bridged by N,N′‐bis[2‐(dimethylamino)ethyl]oxamido dianion (dmoxae) and end‐capped with 5‐nitro‐1,10‐phenanthroline (NO2phen), 2,9‐dimethyl‐1,10‐phenanthroline (Me2phen) or 5‐phenyl‐1,10‐phenanthroline (Phphen), respectively; namely, [Cu(dmoxae)Mn(NO2phen)2]…
Photoluminescence (PL) and resonant Raman scattering (RRS) excited by the 351.1nm line of an Ar+ laser were studied in highly conductive ZnO layers deposited by thermal decomposition of Zn(C5H7O2)2 metalorganic compound on porous InP substrates. The emission spectra consist of multiphonon RRS lines superimposed on a b…
Single wall carbon nanohorns (SWNHs) were fluorinated to form more attractive nanohorns that have characteristic structural and adsorptive properties. Nitrogen adsorption, XPS, and TEM studies elucidated the surface states and the morphologies of fluorinated SWNHs (F−SWNHs). The XPS results of F−SWNHs showed that the…
In recent years unexpected magnetic field effects have been observed in dielectric measurements on insulating glasses at very low temperatures. Polarization echo experiments have indicated that atomic tunneling systems are responsible for these effects and that the nuclear properties of the tunneling particles are of…
Nanoscale islands of Cu2O have been synthesized on single-crystal SrTiO3 (100) substrates using oxygen plasma-assisted molecular-beam epitaxy (MBE). Island growth location has been controlled by using an ex situ Ga+ focused ion beam (FIB) to modify the growth surface in discrete locations prior to island synthesis. Th…
Biocomposite thin films assembled on colloidal particles by means of layer-by-layer adsorption have been suggested as drug carriers and diagnostic devices. Protamine (PRM)/dextransulfate (DXS) and protamine/bovine serum albumine (BSA) multilayers were fabricated on colloidal silica and subsequently investigated by mea…
Thin films of ${\mathrm{Pb}}_{0.76}{\mathrm{Ca}}_{0.24}{\mathrm{TiO}}_{3}$ (PTC), which is a classical ferroelectric as a bulk material and of the relaxor material $\mathrm{Pb}({\mathrm{Sc}}_{0.5}{\mathrm{Nb}}_{0.5}){\mathrm{O}}_{3}$, have been produced to find out whether nanocrystalline ferroelectric films show a gr…
The first singlet excited state lifetimes (τs) of asymmetric pentaazadentate porphyrin-like complexes, [(R-APPC)M]Cln, were measured by the time-correlated single photon counting method. Fluorescent decays of the first singlet excited state for all [(R-APPC)M]Cln were found to be shorter than 0.5ns. The intersystem cr…
This article describes a novel biomimetic strategy for the synthesis of CaCO 3 crystals with different structures by a supported liquid membrane containing a mobile carrier, and first reports the abnormal structure conversion of CaCO 3 from calcite to vaterite. Furthermore, we found that the sub-micron-sphere vaterite…
A novel poly(vinyl chloride)-based polymer ( 1 ) containing Mo−Mo bonds along the backbone was prepared by the reaction of carboxylated PVC (ca. 1.8 wt % −COOH) with (HOCH 2 CH 2 Cp) 2 Mo 2 (CO) 6 . When irradiated with visible light, this polymer photodegrades, even in the absence of oxygen. Infrared spectroscopic an…
[structure: see text] Novel porphyrin perylene dyad and triad dyes have been prepared by the coupling of aminophenyltrisphenylporphyrin and tetraphenoxy-substituted perylenetetracarboxylic acid bisanhydrides in a one-step synthesis. Fluorescence spectra of these compounds reveal features that are attributable to emiss…
UV-ozone cleaning prior to metal deposition of either e-beam Pt contacts or sputtered W contacts on n-type single-crystal ZnO is found to significantly improve their rectifying characteristics. Pt contacts deposited directly on the as-received ZnO surface are Ohmic but show rectifying behavior with ozone cleaning. The…
The selective oxidation of styrene on clean and modified Ag(100) surfaces has been studied by synchrotron fast XPS and temperature-programmed reaction spectroscopy. By following the time dependence of surface species, it is unequivocally demonstrated that the necessary and sufficient conditions for epoxide formation a…