Materials Literature
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Abstract Er‐doped ZnO nano‐ and microstructures have been grown by thermal treating of compacted mixtures of ZnO and Er 2 O 3 powders and their optical properties have been studied by cathodoluminescence (CL). Annealing the pressed samples leads to the growth of nanoneedles and nanoneedle networks, as well as rods. CL…
This paper presents the calculated and experimental interference colors of liquid crystal (LC) films due to the optical retardation of two orthogonal electromagnetic components at different surface anchoring conditions and applied voltages. We simulate the deformation of LC director using finite element method and con…
Abstract We report Ge nanocrystals (NCs) based dual functional light emitting and metal insulator semiconductor (MIS) flash memory devices, fabricated by rf sputtering. Transmission electron micrographs revealed the formation of spherically shaped Ge NCs. We have observed broad electroluminescence (EL) around 760 nm,…
It is often assumed that single-walled carbon nanotubes grown via catalytic chemical vapor deposition are free of defects, particularly when suspended over a trench. Here we show that semiconducting nanotubes grown in this manner can contain a surprisingly large number of states within the band gap. High-resolution ph…
A lubrication model is used to study the dynamics of nanoscale droplets on wettability gradient surfaces. The effects of the gradient size, size of the nanodroplets and the slip on the dynamics have been studied. Our results indicate that the position of the center of mass of the droplets can be well described in term…
This study proposes in situ optical microspectroscopy as a means for the investigation of particle growth and metal transport in nanocomposite systems based on the temperature- and time-dependent optical response of the material. The technique has been successfully employed for the real-time monitoring of the growth o…
We performed a systematic investigation of the physical properties of CeFeAs${}_{1\ensuremath{-}x}$P${}_{x}$O${}_{0.95}$F${}_{0.05}$ (0 $\ensuremath{\leqslant}x\ensuremath{\leqslant}$ 1) by measuring electrical resistivity, magnetization, and specific heat. Superconductivity (SC) was observed in a wide range of P dopi…
In the present work, we show that a porous alumina template can easily be filled with magnetic nanoparticles and then be sealed by a hot water treatment (by forming an aluminium oxyhydroxide (AlOOH) sealant layer). The porous layer then can be separated from the substrate by an etch to form free magnetic AlOOH nano-ca…
Inelastic neutron scattering was used to study a quantum $\mathcal{S}=1/2$ antiferromagnetic Heisenberg system--- Bis(2-amino-5-fluoropyridinium) Tetrachlorocuprate(II). The magnetic excitation spectrum is shown to be dominated by long-lived excitations with an energy gap of $\ensuremath{\Delta}=1.07$(3) meV. The meas…
Hydrothermal synthesis (and other soft chemistry based thermal conversion routes) has emerged as one of the thriving methods for high quality one-dimensional (1D) nanostructures. However, it is still a great challenge to repair the pores and preserve the 1D morphology during the thermal conversion. The effects of the…
Filling the pores: A two-layer anodized alumina template consists of two sorts of parallel pores—through-pores and capped-pores. By selectively filling only the through-pores by various techniques, and then wet-chemically etching the walls between the capped-pores, a generic synthetic approach to alumina-sheathed nano…
We investigate field enhancements in two-dimensional 800 nm periodic arrays of (108–121 nm deep) V-grooves (opening angles 38°–75°) fabricated using focused ion beam milling in a 190 nm thick gold film on top of a fused silica substrate. Simulated and experimental reflectio…
The EtMe(3)P and EtMe(3)Sb triangular organic salts are distinguished from other Pd[(dmit)(2)] based salts, as they display valence bond and no long-range order, respectively. Under pressure, a superconducting phase is revealed in EtMe(3)P near the boundary of valence bond order. We use slave-rotor theory with an enla…
A series of thermo-responsive shape memory polymers were developed from commercially available polyalkenamer by balancing competitive crystallinity and elasticity via a monofunctional peroxide based crosslinking process. The main thermomechanical and shape memory properties of covalently crosslinked samples were chara…
While yttrium and impurity segregation at interfaces of yttria-stabilized zirconia (YSZ) has been intensively studied experimentally, the mechanisms governing the propensity for segregation are still not fully understood. The segregation energetics of yttrium and aluminum, another common segregant at interfaces of YSZ…
The knowledge of intramolecular dynamics, geo-metric confinement, and structure of surface-bound ligands are important factors for understanding surface chemistry, catalysis, and design of catalytically optimized nanoparticles. In this report, intramolecular dynamics of perdeuterated triphenylphosphine ligands, d 15 -…
We report on theoretical calculations of the optical conductivity of Ba(Fe${}_{1\ensuremath{-}x}$Co${}_{x}$)${}_{2}$As${}_{2}$, as obtained from density functional theory within the full-potential linear augmented plane-wave method. A thorough comparison with experiment shows that we are able to reproduce most of the…
Nano-sphere lithography technique was used to fabricate nano-patterned Si substrates with various depths by controlling the etching time. The depth-dependent broadband anti-reflection was observed and the reflectivity could be reduced to 5%. By depositing Si quantum dots/SiO2 multilayer on nano-patterned substrate, th…
The recent observation of high flexibility in buckled boron nitride nanotubes (BNNTs) contradicts the pre-existing belief about BN nanotube brittleness due to the partially ionic character of bonding between the B and N atoms. However, the underlying mechanisms and relationships within the nanotube remained unexplored…
Superhydrophobic surfaces based on polydimethyl siloxane (PDMS) were fabricated using a 50:50 PDMS-poly(ethylene glycol) (PEG) blend. PDMS was mixed with PEG, and incomplete phase separation yielded a hierarchic structure. The phase-separated mixture was annealed at a temperature close to the crystallization temperatu…