Materials Literature
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Work function engineering of graphene facilitates its application as a transparent electrode material in organic electronic devices. Toward this end, we demonstrate the dependence of the work function of plasma-fluorinated epitaxial graphene on the polarity of carbon-fluorine bonds which is controlled by the nature of…
Organization studies leading to reorganizing companies, divisions, and functions have been one of the more spectacular ‘growth industries’ of the last few decades. Everybody, whether business, government department or armed service, research laboratory, Catholic diocese, university administration or hospital seems to…
Abstract Raman scattering from binary Ge x Se 100 − x glasses excited using 1064 nm radiation display vibrational modes whose linewidths significantly exceed those observed using 647 nm radiation. In these glasses, 1064 nm radiation excites midgap states while 647 nm radiation excites conduction band tail states. Pres…
We report a study on the desorption properties, crystallography and chemical state of MgH2 and 1 mol% Nb2O5 ball-milled composites. Desorption temperatures of the composites decreased with increase of ball-milling time. Size of MgH2 crystallites decreased during ball-milling. Reduction of Nb2O5 after ball-milling was…
Abstract The aim of this study was to prepare polyvinyl alcohol/carbon nanotube (PVA/CNT) conductive nanofibers by the electrospinning process. Prior to composite preparation, carbon nanotubes are dispersed homogeneously in N-methyl-2-pyrrolidone (NMP) and mixed with a PVA solution. A series of PVA/CNT films and nanof…
Lanthanum doping for calcium in CaFe${}_{2}$As${}_{2}$ results in negative thermal expansion that can be exceptionally large. The behavior is unusual among Fe-As materials, and is presumably associated with the close proximity of CaFe${}_{2}$As${}_{2}$ to a structural phase instability.
We experimentally investigate the nonlinear response of two-dimensional periodic arrays composed of gold nanopatches on silicon substrate, functionalized by means of a conjugated rigid thiol. The surface-enhanced Raman scattering (SERS) response is empirically evaluated using a laser source operating in the visible sp…
The development of quasi-1D Co 3 O 4 /ZnO nanocomposites by a two-step plasma enhanced-chemical vapor deposition (PE-CVD) process is presented. Arrays of ⟨001⟩ oriented ZnO nanorods were first grown on Si(100) and subsequently used as templates for the PE-CVD of Co 3 O 4, whose amount was tailored as a function of dep…
A new series of asymmetric bent-core compounds were synthesised using azo linkages with equal as well as unequal terminal alkyl chains and their photo and electrical switching properties investigated. The mesomorphic properties were characterised using polarised optical microscopy, X-ray diffraction and differential s…
Antiferroelectric Pb(Zr, Nb, Ti)O3 (PZNT) films were deposited via a sol-gel process on Pt(111)/Ti/SiO2/Si, LaNiO3- and La0.5Sr0.5CoO3-buffered Si substrate. The scaling behavior of the energy density W of antiferroelectric films was investigated. The scaling behavior of W against frequency f of PZNT on LaNiO3-buffere…
Aiming to explore strain effects on the dielectric permittivity of ultrathin films of oxides with spinel structure, we report here on the thickness (4--160 nm) dependence of the dielectric response of CoFe${}_{2}$O${}_{4}$ (CFO) epitaxial films grown on La${}_{2/3}$Sr${}_{1/3}$MnO${}_{3}$ buffered SrTiO${}_{3}$(001) s…
We present the results of polarized Raman spectroscopy of hexagonal BaFe 12 O 19 single crystal. The spectra, recorded from 200 to 800 cm –1 and 1100 to 1700 cm –1 in the 20–250 K temperature range, are analyzed on the basis of both crystal vibrations and spin‐waves. In the low wavenumber range, the Γ‐point phonons ar…
Here, we report direct experimental evidence for the presence of flat bands, close to the Fermi level, in one-dimensional topological defects of graphite. The flat bands are manifested by a pronounced peak in the tunnelling density of states. Our ab initio calculations indicate that the flat bands with vanishing Fermi…
Abstract The crystallization kinetics of Ge–Sb–Se chalcogenide glasses prepared by melt‐quenching method was investigated using differential scanning calorimetry under non‐isothermal conditions with several different heating rates. Kissinger's equation and Matusita model were employed to analyze kinetic crystallizatio…
Carbon nanotube networks in thin-film type transistors were studied experimentally, comparing the use of pre-separated semiconducting enriched nanotubes (90% and 99% purity) to examine how topology affects the properties of the devices. Measurements are reported for two deposition methods used for network formation: r…
Luminescent nanophase europium-doped ZrO 2 precursors are subjected to pyroprobe heating with nominal heating rates of 20 000 °C/s for 1 and 10 s to various temperatures. When heated above the crystallization temperature, the material forms tetragonal and monoclinic polymorphs. Optical spectroscopy is used to measure…
Abstract Sisal fiber (SF)‐reinforced poly(lactic acid) (PLA) biocomposites were prepared from biodegradable PLA and surface‐untreated or ‐treated short SF by melt mixing and subsequent compression molding. It is found that the surface treatments facilitate good adhesion between SFs and PLA matrix, which is consistent…
A simple method to fabricate centimeter-sized thin films of graphene oxide (GO) is developed via drying the relative liquid film supported by a rigid frame. After reduction, centimeter-sized thin reduced GO films are obtained, and the maximum transparency is 75.8% while the minimum sheet resistance is 920 Ω □(-1) .
Ferromagnetic thin films of the A-site nano-ordered double perovskite LaBaCo(2)O(5.5+δ) (LBCO) were grown on (001) MgO, and their structural and magnetic properties were characterized. The as-grown films have an excellent epitaxial behavior with atomically sharp interfaces, with the c-axis of the LBCO structure lying…
Many anticancer drugs have been established clinically, but their efficacy can be compromised by nonspecific toxicity and an inability to reach the desired cancerous intracellular spaces. In order to address these issues, researchers have explored the use of folic acid as a targeted moiety to increase specificity of c…