Materials Literature
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Surfactants are widely used as templates to control the nucleation and growth of nanostructured metal oxides such as titania. To gain insight into the origin of the surfactant-titania interactions responsible for polymorph and orientation selection, we simulate the self-assembly of an anionic surfactant monolayer on v…
A new heteroarylene-vinylene donor-acceptor low bandgap polymer, the poly(DEHT-V-BTD), containing vinylene-spaced efficient donor (dialkoxythiophene) and acceptor (benzothiadiazole) moieties, is presented. Electropolymerization has been carried out by several electrochemical techniques and the results are compared. In…
Abstract Moderately functionalized graphenes, prepared by the thermal reduction of graphite oxide, were utilized to prepare electroconductive graphene/nylon 6 composites which exhibited a highest conductivity value of 6.84 × 10 −4 S cm −1 for a low carbon incorporation of 0.54 wt% and a lowest percolation threshold of…
Intraband splitting energies in graphene quantum dots are on the order of the fundamental phonon energies, creating a single-phonon relaxation pathway. Yet, charge carrier thermalization is slow. Our time-domain, ab initio computations demonstrate that the slow rate of electronic relaxation is due to quantum decoheren…
Using an external magnetic field, we have demonstrated room temperature control of the electric polarization of a ferroelectric polymer, polyvinylidene fluoride (PVDF), in an artificial multiferroic structure. For ferroelectric PVDF polymer thin films in an iron-PVDF-iron heterostructure, both the ferroelectric coerci…
Atomic structures of liquid and undercooled Cu55Hf45 and Cu62Hf38 alloys have been studied using first-principles molecular dynamics simulations. It is found that both chemical short-range order and icosahedral short-range order are more pronounced at xCu = 0.55. We also evidence differences with the atomic structures…
We report nuclear magnetic resonance data in the bilayer nickelate La${}_{3}$Ni${}_{2}$O${}_{6}$. This material belongs to a family of low valence nickel oxides with square planar coordination of the Ni ions and is isoelectronic to the high temperature superconducting cuprates. Although the three layer nickelate compo…
Residual defects after growth of semiconductors crystals is a hot issue to be solved for manufacturing new efficient electronic or optic devices. These defects can be conveniently observed using birefringence optical microscopy for extended defects that will create a local strain field which in turn can cause a nomina…
Graphene field effect transistors and capacitors that employ ultra-thin atomic layer deposited high-κ TiO2 dielectrics are demonstrated. Of the three TiO2 gate insulation schemes employed, the sequentially deposited HfO2:TiO2 gate insulator stack enabled the reduction of equivalent oxide thickness while simultaneously…
The anisotropic resistivities (AR) in La0.67Ca0.33MnO3 films grown on orthorhombic NdGaO3(100) substrates were investigated. In this epitaxial system, the large anisotropic misfit strain was demonstrated to induce an antiferromagnetic insulator (AFI) phase transition near ∼250 K, leading to phase separation (PS) with…
With extreme ultraviolet lithography (EUVL) emerging as one of the top contenders to succeed from optical lithography for the production of next generation semiconductor devices, the search for suitable resists that combine high resolution, low line edge roughness (LER) and commercially viable sensitivity for high vol…
On a nanosecond time scale, solid insulators abnormally fail in bulk rather than on surface, which is termed as the “worm-hole” effect. By using a generator with adjustable output pulse width and dozens of organic glass (PMMA) and polystyrene (PS) samples, experiments to verify this effect are conducted. The results s…
A three-layer graded-refractive-index antireflection coating is designed and prepared on the one surface of the Bi3Ge4O12 scintillator by sol-gel technology. The emission intensity of the Bi3Ge4O12 with a graded-refractive-index antireflection coating exhibits a broadband and omnidirectional enhancement of 15.9% compa…
The structure development during the drawing of PTT films immediately above the glass transition temperature at two different strain rates (8.33 × 10 –3 and 8.33 × 10 –4 s –1 ) has been investigated using differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy. It was found that both…
For quantum dots (QDs) synthesized in solvents that are immiscible in water, dietary, rather than aqueous, exposure is expected to be the primary route of uptake. The estuarine snail Peringia ulvae was presented with mats of simulated detritus spiked with oleic acid capped cadmium sulfide (CdS; 3.1 ± 0.4 nm) or cadmiu…
The compressive response of nanoporous (np) Au with different porosities and ultrathin ligaments of widths 0.5–16 nm is investigated through molecular dynamics (MD) simulations. From the results of the uniaxial compressive loading, it was found that these materials behave in a ductile manner and possess characteristic…
Abstract Electroactive polyimide ( EPI ) nanocomposites with amino‐capped aniline trimer and 4′‐(4,4′‐isopropylidene‐diphenoxy)bis(phthalic anhydride) as monomers, and functionalized with carboxyl‐graphene nanosheets, were prepared by thermal imidization. The as‐prepared electroactive polyimide/graphene nanocomposite…
ABSTRACT A novel flame retardant composed of montmorillonite (MMT) and hexachlorocyclotriphosphazene (HCCP) was prepared in this study. MMT was chemically bonded with HCCP via a 3‐aminopropyltriethoxysilane (KH‐550) coupling agent. The structure was characterized by Fourier transform infrared spectroscopy, X‐ray diffr…
Abstract We present work on the fabrication and the characterization of ohmic contacts on single zinc oxide nanowires grown by metalorganic chemical vapour deposition. We demonstrate pre‐positionning of single nanowires before electronic‐beam lithography for 2 point metallic contacts. We characterize single nanowires…
Transition metal oxide cluster anions M(m)(18)O(n)(-) (M = Fe, Co, Ni, Cu, and Zn) were prepared by laser ablation and reacted with H2S in a fast flow reactor under thermal collision conditions. A time-of-flight mass spectrometer was used to detect the cluster distributions before and after the interactions with H2S.…