Materials Literature
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Lithium and nitrogen dual-doped ZnO films [ZnO:(Li, N)] with Li concentrations of 0%–11.2% were grown on sapphire by plasma-assisted molecular beam epitaxy, and a stable p-type ZnO:(Li, N) film was obtained by doping 6.1% of Li. The p-type conductivity of ZnO:(Li, N) is attributed to the formation of the Lii–NO comple…
In this Note, we report a modified coaxial electrospinning process, in which an unspinnable concentrated polymer solution acted as a guide and a pure solvent was used as sheath fluid to facilitate the process and thin the fibers. Polyvinylpyrrolidone and Eudragit L100 are used as model polymers to demonstrate the modi…
Deep-cleaned hydrogen can be made available for fuel cells in one step. 1 vol % CO contained in hydrogen was removed to levels of less than 10 ppm over ruthenium-doped mesoporous Ni-Al oxides (see picture) by selective CO methanation, with a working temperature window greater than 50 °C that included the 200–250 °C ra…
On the double: When a poly(3-methylthiophene) (PT) film is doped on a bipolar electrode with Bu4NPF6 as supporting electrolyte, the film includes PF6− anions with a composition gradient along the potential gradient on the electrode. The use of Et4NCl results in partial chlorination of the PT film that reflects the pot…
The interaction among topological defects can induce novel phenomena such as disclination pairs in liquid crystals and superconducting vortex lattices. Nanoscale topological vortices with swirling ferroelectric, magnetic, and structural antiphase relationships were found in multiferroic h-YMnO(3). Herein, we report th…
In this paper we present a theoretical study of water sorption on cobalt spinel nanocrystals by means of plane-wave periodic density functional theory (DFT) calculations jointly with statistical thermodynamics. The three most stable (100), (110), and (111) planes exposed by Co 3 O 4 were considered, and their stabiliz…
The authors report on the dielectric, magnetic, and magnetoelectric (ME) properties of La and Ti codoped BiFeO3 (LBFTO). Codoping changes the structure of BiFeO3 from rhombohedral to tetragonal and the ferromagnetic properties of LBFTO are remarkably improved. More interestingly, the dielectric constant of LBFTO shows…
Quantum dot sensitized solar cells have the potentiality to emerge as viable third-generation photovoltaic devices. In these cells, the photoanode is constituted by a nanostructured oxide layer sensitized to the visible by suitable quantum dots (QDs). Here, we report on some aspects of the sensitization of titanium di…
We study combined effect of hydrostatic pressure and magnetic field on the magnetization of ${\text{La}}_{0.5}{\text{Ca}}_{0.5}{\text{MnO}}_{3}$. We do not observe any significant effect of pressure on the paramagnetic to ferromagnetic transition. However, pressure asymmetrically affects the thermal hysteresis across…
Superelasticity (SE) in bulk materials is known to originate from the structure-changing martensitic transition which provides a volumetric thermodynamic driving force for shape recovery. On the other hand, structure-invariant deformation processes, such as twinning and dislocation slip, which result in plastic deform…
The synthesis of Pd nanoparticles (NPs) in solution and on surfaces through a seed-mediated growth route is reported. For the Pd NPs synthesized in solution, the diameters of the Pd NPs can be readily tuned from 33 to 110 nm, maintaining good monodispersities by using different amounts of ca. 3 nm gold NPs as seeds. T…
We study the plasmons confined at the gap between silver nanospheres and silver planar surfaces by means of angle- and space-resolved spectral cathodoluminescence. Plasmons in individual nanoparticles are excited by an electron beam, giving rise to light emission that is analyzed as a function of photon-energy, emissi…
Dendrimers have several unique properties that make them attractive scaffolds for use in biomedical applications. To date, multivalent and multimodal dendritic structures have been synthesized predominantly by statistical modification of peripheral groups. However, the potential application of such probes in patients…
We discuss an efficient approach to excited electronic states within ab initio many-body perturbation theory (MBPT). Quasiparticle corrections to density-functional theory result from the difference between metallic and nonmetallic dielectric screening. They are evaluated as a small perturbation to the density-functio…
The interaction between plasmonic nanoparticles is investigated by means of transformation optics. The optical response of a dimer can be decomposed as a sum of modes whose resonances redshift when the nanoparticles approach each other. The extinction and scattering cross sections as well as the field enhancement indu…
Pillars of salts: By combining planar cations and planar anionic structures based on π-conjugated acyclic dipyrroles containing an anion, charge-by-charge assemblies could be formed (see picture). Not only crystals but also soft materials, such as supramolecular gels and thermotropic liquid crystals, could be made by…
We report the use of two different sizes of dogbone shaped gold nanoparticles as colloidal substrates for surface enhanced Raman spectroscopy (SERS) based detection of ultra-low levels of thiram, a dithiocarbamate fungicide. We demonstrate the ability to use a solution based, direct readout SERS method as a quantitati…
We report a self-powered ultraviolet photodetector based on a single Sb-doped ZnO nanobelt bridging an Ohmic contact and a Schottky contact. The photoresponse sensitivity and the response time of the fabricated device are as high as 2200% and less than 100 ms, respectively. The performance of the device dramatically d…
The fabrication of Schottky diodes withstanding breakdown voltages up to 10 kV is demonstrated. A corresponding electric field of 7.7 MV/cm at the center of the diode is evaluated with the help of a two-dimensional finite elements software. These properties result from a net shallow acceptor concentration below 1016 c…
A wide variety of coupled harmonic oscillators exist in nature1. Coupling between different oscillators allows for the possibility of mutual energy transfer between them2-4 and the information-signal propagation5,6. Low-energy input signals and their transport with low-energy dissipation are the key technical factors…