Materials Literature
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Highly efficient up-conversion luminescence in BaCl2:Er3+ phosphors via simultaneous multiwavelength excitation, Chen, Zhi, Zhang, Xiaowen, Zeng, Shengfeng, Liu, Zhengjun, Ma, Zhijun, Dong, Guoping, Zhou, Shifeng, Liu, Xiaofeng, Qiu, Jianrong
Abstract: Nano-sized Y2Mo4O15:Eu3+ was synthesized by the pechini method. The crystalline phase was confirmed by the structural refinements. The photoluminescence (PL) excitation and emission spectra, and decay lifetimes were investigated. The phosphors can be efficiently excited by near-ultraviolet light and exhibit…
The modal method based on Gegenbauer polynomials (MMGE) is extended to the case of bidimensional binary gratings. A new concept of modified polynomials is introduced in order to take into account boundary conditions and also to make the method more flexible in use. In the previous versions of MMGE, an undersized matri…
Thermally reduced graphene modified with cationic ammonium ions (AAG)—affording a stable dispersion in water—self‐assembles well by electrostatic interaction on the surface of anionic poly(methyl methacrylate) (PMMA) particles of various sizes, by simple mixing in water. An interconnected 3D electrically conductive ne…
Thermal oxidation (TO) treatments were performed at 873 K, 898 K, 923 K, 948 K, 973 K, 998 K and 1023 K for 10 h in air to improve the wear and corrosion resistance of Ti 6 Al 4 V alloy. The effect of TO temperature on microstructural characterizations and surface properties of the obtained TO layers were investigated…
The conductivity of carbon nanotube thin films is mainly determined by carbon nanotube junctions, the resistance of which can be reduced by several different methods. We investigate electronic transport through carbon nanotube junctions in a four-terminal configuration, where two metallic single-wall carbon nanotubes…
Near-infrared light-emitting devices based on chirality-sorted (8,3), (8,4) enriched carbon nanotubes (CNTs) are fabricated on transparent and flexible substrate. The devices emit near-infrared light with well-defined wavelength, narrow peak width and high intensity. 500 times bending test also shows that the electric…
An amphiphilic basket of type 1 (339 Å(3)) has been found to assemble into unilamellar vesicles in water. The assembled host encapsulates organophosphonates (OPs) (119-185 A(3)) with a particularly high affinity (Ka ∼ 10(5) M(-1)) toward dimethyl phenylphosphonate (185 Å(3)) whose size and shape resemble that of soman…
In this paper, we report on the development of a versatile compact model for graphene FETs (GFETs). Aging studies have been performed on the GFETs via bias stress measurements and aging laws were implemented in the compact model, including failure mechanisms in the GFETs. The failure mechanisms are identified to be or…
Presented here is the first effort to study the formation and dynamics of the triruthenium cluster (Ru 3 O) pyrazine-bridged dimer mixed-valence state. Femtosecond transient absorption spectroscopy was implemented to follow photoinduced electron-transfer reactions in a series of asymmetric porphyrin-coordinated dyads,…
UNLABELLED: We report the design, testing, and in vivo application of pH-sensitive contrast agents designed specifically for Cerenkov imaging. Radioisotopes used for PET emit photons via Cerenkov radiation. The multispectral emission of Cerenkov radiation allows for selective bandwidth quenching, in which a band of ph…
We investigated the occurrence and nature of superconductivity in single crystals of grown out of Sn flux by employing X-ray diffraction, electrical resistivity and specific heat measurements. We found that the residual resistivity ratio (RRR) of single crystals can be greatly improved, reaching as high as , by decant…
We study tunneling of quasiparticles through potential barriers in a graphene monolayer with the mass gap using a semiclassical (WKB) approach. The main equations are derived in a way similar to the WKB theory for the Schr\"odinger equation, which allows for explicit solutions at all orders. The analog of the classica…
Materials with embedded nanoparticles are of considerable interest for thermoelectric applications. Here, we experimentally characterize the effect of nanoparticles on the recently discovered Lévy phonon transport in semiconductor alloys. The fractal space dimension α ≈ 1.55 of quasiballistic (superdiffusive) heat con…
Chemical vapor deposition (CVD)-grown single-layer graphene samples, transferred onto a transmission electron microscope (TEM) grid and onto a quartz plate, were studied using polarized Raman spectroscopy with differing angles of laser incidence (θ). Two different polarization configurations are used. In an in-plane c…
Abstract The combination of a bent diamino(nickel(II) porphyrin) with 2‐formylpyridine and Fe II yielded an Fe II 4 L 6 cage. Upon treatment with the fullerenes C 60 or C 70 , this cage was found to transform into a new host–guest complex incorporating three Fe II centers and four porphyrin ligands, in an arrangement…
Two types of amorphous functional materials, based on lightsensitive inorganic compounds like Se and As20Se80 chalcogenide glass (ChG) were investigated with the aim to establish the influence of plasmonic fields, excited by the band-gap light in nanocomposite layers made of these compounds and gold nanoparticles on t…
Recently, the paraelectric response of water was investigated in the range 0–100 °C. It showed an almost perfect Curie–Weiss behaviour up to 60 °C, but a slight change in slope of 1/εd versus T at 60 °C was overlooked. In this work, we report optical extinction measurements on metallic (gold and silver) nanoparticles…
We demonstrate that the electrical conductivity of metal/semiconductor oxide heterojunctions can be increased over 7 orders of magnitude by inserting an ultrathin layer of LaAlO3. This counterintuitive result, that an interfacial barrier can be driven transparent by inserting a wide-gap insulator, arises from the larg…
Ultrafast thermalized and hot-hole-transfer processes have been investigated in CdSe quantum dot (QD)/catechol composite systems in which hole transfer from photoexcited QDs to the catechols is thermodynamically favorable. A series of catechol derivatives were selected with different electron-donating and -withdrawing…