Materials Literature
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A submicron light-emitting device (LED) was fabricated from lithographically fabricated parallel indium-tin oxide (ITO) finger electrodes (0.9 mum wide) separated by a 1.1 mum gap. A single layer of an amorphous (a) Ru(bpy)3(ClO4)2 film ( approximately 100 nm thick) was spin-coated on the electrode array. Ga:In or car…
The actual ambiguity in the interpretation of the Raman-active vibrations of tetragonal ${\mathrm{ZrO}}_{2}$ is discussed as a factor impeding progress in long-standing investigations of the polymorphism of zirconia. The reliable symmetry assignment of these vibrations is proposed by analyzing a polarized light scatte…
peer reviewed
On the basis of extended irreversible thermodynamics [D. Jou, J. Casas-Vazquez, and G. Lebon, Rep. Prog. Phys. 51, 1005 (1988); 62, 1035 (1999)] an analysis of the solid-liquid interface motion is presented. In addition to the formalism of the classic irreversible thermodynamics of Onsager and Prigogine, a space of in…
Photoelectron spectra of ${\mathrm{Al}}_{12}{X}^{\ensuremath{-}}$ $(X=\mathrm{C},$ Ge, Sn, Pb) were measured to probe the electronic structure of ${\mathrm{Al}}_{12}X.$ These clusters, all possessing 40 valence electrons, were expected to be magic numbers with ${I}_{h}\ensuremath{-}X@{\mathrm{Al}}_{12}$ structures, cl…
A series of [2]-rotaxanes has been synthesized in which two Zn(II)-porphyrins (ZnP) electron donors were attached as stoppers on the rod. A macrocycle attached to a Au(III)-porphyrin (AuP+) acceptor was threaded on the rod. By selective excitation of either porphyrin, we could induce an electron transfer from the ZnP…
Phonon dispersion relations of a two-dimensional (2D) graphite are obtained by fitting dispersive Raman modes that originate from nonzone center phonons near the $\ensuremath{\Gamma}$ or K point in the Brillouin zone (BZ). A new set of 12 force constants of 2D graphite up to the fourth neighbor are determined by a sel…
Multicomponent M(II)/Al/Zr layered double hydroxides (LDHs) with M(II) = Mg, Ni, and Zn, exhibiting single hydrotalcite-like phases by XRD, were obtained by coprecipitation at constant pH = 10. The cationic contents were close to those of the solutions, excepted for Zr, for which 95, 70, and 65 mol % of the amount in…
In this work, we report the effectiveness of the NaY zeolite as a solid support for several photocatalytically active polyoxometalate (POM) salts (H 2 NaPW 12 O 40, H 4 SiW 12 O 40, or H 3 PMo 12 O 40 ) as indicated by the photodegradation kinetics of the probe compound 1,2-dichlorobenzene (DCB) in water. The photooxi…
The electric field directed layer-by-layer assembly (EFDLA) method is used to fabricate a pattern of two different types of CdTe nanocrystals on a structured indium−tin−oxide (ITO) substrate. Such a pattern can be used to fabricate pixel arrays of CdTe light-emitting devices that emit electroluminescence of different…
The polyoxomolydate of the Keggin structure, PMo12O403-, catalyzes, under anaerobic conditions, oxygen transfer from sulfoxides to alkylarenes such as xanthene and diphenylmethane to yield xanthen-9-one and benzophenone, respectively. With use of 17O and 18O labeled phenylmethylsulfoxide it was shown that the sulfoxid…
Poly(methacrylic acid- g -ethylene glycol) (P(MAA- g -EG)) has been studied extensively in our laboratory due to its extremely promising applications in the biomedical and pharmaceutical fields. It exhibits pH-responsive interpolymer complexes that make it a promising candidate as an oral carrier for peptide and prote…
Alternating copolymers of 9,9-dioctylfluorene and oxadiazole have been prepared by the tetrazole route or the Suzuki coupling reaction. In the polymers the oxadiazole units were evenly dispersed in the main chain at every one, P(F 1 - alt -Ox), three, P(F 3 - alt -Ox), or four, P(F 4 - alt -Ox), fluorene units. Anothe…
A series of Fe and Fe/Mo catalysts, supported on alumina, were examined for Single-Walled Nanotube (SWNT) growth by Chemical Vapor Deposition (CVD) in methane. Molybdenum (20 wt %) was found to provide a clear synergistic benefit, lowering the growth temperature and eliminating the need for catalyst activation in hydr…
We have measured magnetic and transport response on the polycrystalline ${\mathrm{La}}_{5/8\ensuremath{-}y}{\mathrm{Pr}}_{y}{\mathrm{Ca}}_{3/8}{\mathrm{MnO}}_{3}$ $(y=0.30,$ average grain size 2 microns) compound. In the temperature range where ferromagnetic metallic and insulating regions coexist, we observed a persi…
A thin film technology compatible with multilayer device fabrication is critical for exploring the potential of the 39-K superconductor magnesium diboride for superconducting electronics. Using a Hybrid Physical-Chemical Vapor Deposition (HPCVD) process, it is shown that the high Mg vapor pressure necessary to keep th…
Experimental observations of heteroepitaxial growth of Ge on Si(001) show a (2xn) reconstruction for sub-monolayer coverages, with dimer rows crossed by missing-dimer trenches. We present first-principles density-functional calculations designed to elucidate the energetics and relaxed geometries associated with this r…
We use density-functional theory to describe the initial stages of Fe film growth on GaAs(001), focusing on the interplay between chemistry and magnetism at the interface. Four features appear to be generic: (1) At submonolayer coverages, a strong chemical interaction between Fe and substrate atoms leads to substituti…
The recently discovered fine structure of the morphotropic phase boundaries in highly piezoelectric mixture compounds ${\mathrm{PbZr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ (PZT), $\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}{)}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ (PMN-PT), and $\…
The magnetic susceptibility and magnetization of two layered $S=\frac{1}{2}$ Heisenberg antiferromagnets with moderate exchange are reported. The two isostructural compounds, $(2\ensuremath{-}\mathrm{amino}\ensuremath{-}5\ensuremath{-}\mathrm{chloropyridinium}{)}_{2}{\mathrm{CuBr}}_{4}$ $[(5\mathrm{C}\mathrm{A}\mathrm…