Materials Literature
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The phosphorescence emission of ruthenium complexes was applied to the optical imaging of physiological hypoxia. We prepared three complexes with hydrophobic substituents on the phenanthroline ligand and characterized their emission, which was quenched by molecular oxygen. Among the complexes synthesized in this study…
A photoemission study of the electronic structure of a single graphene layer on nickel shows that the electrons in the graphene layer with a broken lattice symmetry still move like massless particles, contrary to what is expected.
A novel polyamine microsphere, prepared from the water-in-oil emulsion of polyethylenimine, was characterized. The investigation of scanning electron microscopy showed that the polyamine microsphere is a regular ball with a smooth surface. The diameter distribution of the microsphere is 0.37-4.29 μm. The isoelectric p…
A composite of manganese hexacyanoferrate (MnHCF) coated by an amorphous manganese dioxide layer was synthesized by a facile co-precipitation method and a further step called “deep electro-oxidation”. The structure and components of the resulting MnHCF/MnO2 composites were characterized by scanning electron microscopy…
Nanoparticles ( NP s) are increasingly recognised for their utility in biological applications including nanomedicine and food safety. The present study investigated the antibacterial activity of zinc oxide (ZnO) when tested against the Gram‐negative bacteria E scherichia coli as well as the Gram‐positive bacterium S…
Inspired by the promising thermoelectric properties of chalcopyrite-like quaternary chalcogenides, here we describe the synthesis and characterization of the solid solution Cu(2)Zn(1-x)Fe(x)GeSe(4). Upon substitution of Zn with the isoelectronic Fe, no charge carriers are introduced in these intrinsic semiconductors.…
A self-consistent theory involving Maxwell equations and a density-matrix linear-response theory is solved for an electromagnetically-coupled doped graphene micro-ribbon array and a quantum-well electron gas sitting at an interface between a half-space of air and another half-space of a doped semiconductor substrate w…
One of the key requirements for good thermoelectric materials is a low lattice thermal conductivity. Here we present a combined neutron scattering and theoretical investigation of the lattice dynamics in the type I clathrate system Ba-Ge-Ni, which fulfills this requirement. We observe a strong hybridization between ph…
We report an experimental assessment of surface kinetic roughening properties that are anisotropic in space. Working for two specific instances of silicon surfaces irradiated by ion-beam sputtering under diverse conditions (with and without concurrent metallic impurity codeposition), we verify the predictions and cons…
Electrospinning is a promising method to mimic the native structure of the extracellular matrix. Collagen is the material of choice, since it is a natural fibrous structural protein. It is an open question how much the spinning process preserves or alters the native structure of collagen. There are conflicting results…
Phases of the Mn2O3: Two new phases of Mn2O3—corundum-type ε-Mn2O3 and perovskite-type ζ-Mn2O3—were obtained by high-pressure high-temperature synthesis. Manganese atoms were found to completely occupy the A- and B-positions of perovskite simultaneously. The perovskite-type ζ-Mn2O3 has an A-site-ordered perovskite str…
The variable range hopping theory, as formulated for exponentially localized impurity states, does not necessarily apply in the case of graphene with covalently attached impurities. We analyze the localization of impurity states in graphene using the nearest-neighbor, tight-binding model of an adatom-graphene system w…
Heteroleptic (C(^)N)(2)Ir(acac) (C(^)N = 4-CBppy (1); 5-CBppy (2), 4-fppy (4) CB = ortho-methylcarborane; ppy = 2-phenylpyridinato-C(2),N, 4-fppy = 2-(4-fluorophenyl)pyridinato-C(2),N, acac = acetylacetonate) complexes were prepared and characterized. While 1 exhibits a phosphorescence band centered at 531 nm, which i…
The development of flexible electronics operating at radio-frequencies (RF) requires materials that combine excellent electronic performance and the ability to withstand high levels of strain. In this work, we fabricate graphene field-effect transistors (GFETs) on flexible substrates from graphene grown by chemical va…
Four novel polyoxometalate-based copper(I)-organic frameworks, namely, [Cu(I)(2)(cis-L1)(2)][Cu(I)(2)(trans-L1)(2)Mo(6)O(18)(O(3)AsPh)(2)] (1), [Cu(I)(4)(L2)(4)Mo(6)O(18)(O(3)AsPh)(2)] (2), [Cu(I)(4)(L3)(4)Mo(6)O(18)(O(3)AsPh)(2)] (3), and [Cu(I)(4)(L4)(2)Mo(6)O(18)(O(3)AsPh)(2)] (4) (L1 = 1,3-bis(1,2,4-triazol-1-yl)p…
Brain cancer tumors cause disruption of the selective properties of vascular endothelia, even causing disruptions in the very selective blood-brain barrier, which are collectively referred to as the blood-brain-tumor barrier. Nanoparticles (NPs) have previously shown great promise in taking advantage of this increased…
Crystallographic data, Seebeck coefficient, electrical resistance and thermal conductivity are reported for a large number of rare-earth compounds, manifestations of the Kondo effect being discussed. In more detail, thermoelectric properties of Yb3Co4Ge13 and Yb3Co4Sn13 compounds and Yb2CeCo4Ge13 and Yb2.3La0.7Co4Ge13…
From the perspective of perturbation theory, we propose a systematic procedure for the evaluation of the derivative discontinuity (DD) of the exchange-correlation energy functional in Kohn-Sham density functional theory (KS-DFT), wherein the exact DD can in principle be obtained by summing up all the perturbation corr…
Resistivity, the Hall effect, the Seebeck coefficient, thermal conductivity, heat capacity, and magnetic susceptibility data are reported for CrSb${}_{2}$ single crystals. In spite of some unusual features in electrical transport and Hall measurements below 100 K, only one phase transition is found in the temperature…
We report the observation of weak magnetism in superlattices of ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ using $\ensuremath{\beta}$-detected nuclear magnetic resonance. The spin lattice relaxation rate of $^{8}\mathrm{Li}$ in superlattices with a spacer layers of 8 and 6 unit cells of ${\mathrm{LaAlO}}_{3}$ exhibit…