Materials Literature
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We investigate the electronic transport characteristics of an electrolyte-gated conducting polyaniline (PANI) nanowire field-effect transistor (FET) assembled between two Au electrodes on SiO2/Si substrate using nanochannel-assisted chemical oxidative polymerization. This is the first demonstration that the current-vo…
This work presents a study of tellurite glasses doped with Eu 3+ and Au nanoparticles. Luminescence of Eu 3+ ions in the yellow–red region was examined as a function of Au nanoparticles concentration, while the thermal lens technique furnished the thermal diffusivity of the samples. The influence of the nanoparticles…
Multilayer superlattices consisting of multiferroic Bi(2)NiMnO(6) (BNMO) and La(2)NiMnO(6) (LNMO) have been grown heteroepitaxially on pure and Nb-doped SrTiO(3) substrates using the pulsed laser deposition technique. In a series of superlattice structures grown with a fixed BNMO layer thickness of ten unit cells, we…
Anomalous dependencies of the dynamic (pulse) and static tunability [k(U)=C(0)/C(U)] as a function of permittivity (ε) were observed in ferroelectric varactors based on doped paraelectric state (Ba,Sr)TiO3 ceramics. The reduction of the relatively high permittivity value from ε≅810 down to ε≅260 by introducing various…
Metal enhanced/quenched luminescence was explored in the vicinity of Ag x Cu 100- x alloy nanoparticles at different compositions ( x = 100, 67, 50, 30, and 0). These Ag−Cu nanoparticles were synthesized using the polyol process. It was observed that the luminescence of dyes was strongly dependent on the Ag−Cu nanopar…
Mg 0.9 Mn 0.1 In x Fe 2− x O 4 ( x = 0.1 and 0.2) and Mg 0.9 Mn 0.1 Al y Fe 2− y O 4 ( y = 0.1, 0.5 and 0.7) ferrites, with improved initial permeability and extremely low relative loss factor (RLF), were synthesized by the citrate precursor technique. Structural studies were made by using the x-ray diffraction techni…
Two kinds of epitaxial structures were grown by standard pulsed laser deposition on (001) Si, namely La(0.7)Sr(0.3)MnO(3)/Bi(4)Ti(3)O(12)/CeO(2) /YSZ/Si (BTO-based), and La(0.7)Sr(0.3)MnO(3)/SrTiO(3)/CeO(2) /YSZ/Si (STO-based) multilayers. The samples were investigated by means of x-ray diffraction, transmission elect…
Ba x Sr 1 − x TiO 3 is ideally suited as a tunable medium for radio frequency passive component. In this context we have studied the effect of biaxial strain on the dielectric and ferroelectric properties of Ba0.5Sr0.5TiO3 thin films grown epitaxially on SrTiO3 (001) substrates. The lattice parameters of the films det…
Thermopower (Sn) of compacted nanocrystalline Ni of average particle size D=38, 32, and 25 nm at low temperatures (5–300 K) is reported here. Sn exhibits striking deviations from bulk thermopower Sbulk behavior revealing evolution of Sn with change in D. As D decreases, there is significant decrease in Sn, gradual dis…
PURPOSE: Previously, we have shown that the amphiphilic oligopeptide SA2 (Ac-Ala-Ala-Val-Val-Leu-Leu-Leu-Trp-Glu-Glu-COOH) spontaneously self-assemble into nano-sized vesicles in aqueous environment. Relative weak individual intermolecular interactions dominate such oligopeptide assemblies. In this study we aimed at i…
We computed thermoelectric properties of nanoporous Ge (np-Ge) with aligned pores along the [001] direction through a combined classical molecular dynamics and first-principles electronic structure approach. A significant reduction in the lattice thermal conductivity of np-Ge leads to a 30-fold increase in the thermoe…
Electronic states of graphenes, whose carbon atoms are terminated by hydrogen atoms (hydrogenated graphene, denoted H-graphene) and defective graphene (one carbon atom was removed from H-graphene, denoted D-graphene) have been investigated by density functional theory. The sizes of graphenes examined in the present st…
Effects of multiwalled carbon nanotubes (MWCNTs) and Ni 2 O 3 on the flame retardancy of linear low density polyethylene (LLDPE) have been studied. A combination of MWCNTs and Ni 2 O 3 showed a synergistic effect in improving the flame retardancy of LLDPE compared with LLDPE composites containing MWCNTs or Ni 2 O 3 al…
The chemical instability of line patterned Ge2Sb2Te5 was studied by transmission electron microscopy after electrically inducing melt and solidification. Compositional analysis showed elemental separation of Te to the anode side, while Ge and Sb mutually separated at the cathode side. Such elemental separation of Ge2S…
We report on structural, magnetic, and transport properties of LaxMnO3−δ (LMO) thin films, epitaxially grown on SrTiO3 substrates by molecular beam epitaxy. Transport properties were investigated as a function of the La/Mn stoichiometry and the oxygen content. Optimal oxygenated LMO films (with stoichiometry ratio La/…
We report a lateral metal-semiconductor-metal (MSM) photodetector (PD) based on an amorphous selenium (a-Se). The PD exhibits a dark current below 200 fA under electric fields ranging from 6 to 12 V/μm, a responsivity of up to 0.45 A/W, a photogain of 1.2 near short wavelengths of 468 nm, and a high-speed photorespons…
We report a simple route to generate nonequilibrium nanostructures combining two known block copolymer (BCP) morphologies by first templating the spatial arrangement of BCP in thin films using a supramolecule. The BCP subsequently assembles within the morphological framework established by the supramolecule, leading t…
Well-defined polymers incorporated BODIPY dyes into the PMMA side chain, and the block copolymers were synthesized by the RAFT process. The controlled/living character of the polymerization of MMA monomers with pendant BODIPY dyes was confirmed by the formation of the narrow molecular weight distribution products, the…
Assemblies of CdSe nanoparticles (NPs) on a dithiol-coated Au electrode were created, and their electronic energetics were quantified. This report describes the energy level alignment of the filled and unfilled electronic states of CdSe nanoparticles with respect to the Au Fermi level. Using cyclic voltammetry, it was…
The crystallographic observation of a hydrophobic, empty channel (diameter approximately 5.2 A) in the peptide Boc-(D)Pro-Aib-Leu-Aib-Val-OMe, prompted the investigation of the analog Boc-(D)Pro-Aib-Val-Aib-Val-OMe in which the side chain at position 3 was shortened, resulting in the structure of a channel (diameter a…