Materials Literature
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We study the optical spectra and electromagnetic field enhancements around cylindrical and triangular Ag nanowire dimers, allowing for a spatially nonlocal dielectric function that partially accounts for quantum mechanical effects. For the triangular structures, we pay particular attention to how these properties depe…
We report on the exchange biasing of self-assembled ferromagnetic GeMn nanocolumns by GeMn-oxide caps. The x-ray absorption spectroscopy analysis of this surface oxide shows a multiplet fine structure that is typical of the Mn2+ valence state in MnO. A magnetization hysteresis shift |HE|~100 Oe and a coercivity enhanc…
ZnO nanoparticles (NP) of size less than around 20 nm inside a chamber exhibits complete reduction in their visible photoluminescence (PL) intensity when partial pressure of oxygen in the surrounding gaseous environment is decreased by evacuation. However the visible PL from ZnO nanoparticles are insensitive to the ga…
This paper has been withdrawn by the author.
We show that silicon nitride can provide uniform coverage of graphene in field-effect transistors while preserving the channel mobility. This insulator allowed us to study the maximum channel resistance at the Dirac (neutrality) point as a function of the strength of a perpendicular electric field in top-gated devices…
Abstract NaCaPO 4 :Ce 3+ ,Tb 3+ phosphors were prepared by a solid‐state reaction. Their luminescence properties reveal that an efficient energy transfer from the Ce 3+ to Tb 3+ ions occurs, and its mechanism is a resonant type by means of a dipole–quadrupole reaction. The critical distance of the energy transfer has…
Particular strain geometry in graphene could lead to a uniform pseudomagnetic field of order 10T and might open up interesting applications in graphene nanoelectronics. Through quantum transport calculations of realistic strained graphene flakes of sizes of 100 nm, we examine possible means of exploiting this effect f…
Treatment of 1-amino-1,2,3-triazole with sodium dichloroisocyanurate led to isolation of 1,1'-azobis-1,2,3-triazole, which was well characterized. Its structure was determined by X-ray crystallographic analysis, and its thermal stability and photochromic properties were investigated.
The local atomic structure of graphene oxide (GO) and reduced annealed graphene oxide (raGO) is determined via ultra-high-resolution transmission electron microscopy. We find that the proposed and desired return to graphene from GO is not possible through the synthetic route employed. The detailed structure of GO, pre…
North Carolina State University Theses Chemistry.
Foi construida uma casa experimental em um terreno da UFRN a partir de blocos confeccionados com um composito constituido de cimento, gesso, EPS, borracha triturada e areia. Foram confeccionados diversos blocos a partir de composicoes variadas e foram efetuados testes preliminares de resistencia mecânica e termica, es…
Surface faceting is used to prepare a nanoscale model Ir catalyst. The cover picture illustrates a schematic of the faceting process on Ir(210) and single three-sided pyramid on faceted Ir(210) exposing (311), (31) and (110) facets. Clean planar Ir(210) and clean faceted Ir(210) are then used to study reduction of NO…
The use of layered …︁ …︁ chalcogenide nanoparticles in composite materials was facilitated by a better binding of the nanoparticles to the chalcogenide/matrix interface. In their Communication on page 7578 ff. W. Tremel et al. present a strategy for the reversible functionalization and formation of MS2/MOx nanoparticl…
Abstract We derive an anisotropy energy VA, a spin‐atomic vibration interaction VSA, and a spin‐flip Hamiltonian VSF of a single atomic spin system, “Fe2+ (3d6) in a crystal field of tetragonal symmetry”. The perturbation theory is here applied to the system with the spin‐orbit interaction and the kinetic and potentia…
Abstract Fluorescence from quantum dots (QDs) sandwiched between colloidal gold nanoparticles and lithographically created metal nanoarrays is studied using engineered peptides as binding agents. For optimized structures, a 15‐fold increase is observed in the brightness of the QDs due to plasmon‐enhanced fluorescence.…
Natural silk fibers provide the raw material to constitute biocompatible films with ideal properties for device integration, as reported by Xin Zhang, Richard D. Averitt, Fiorenzo G. Omenetto, and coworkers on p. 3527. The image shows a metamaterial structure patterned directly onto a 2 cm × 2 cm freestanding silk fil…
Mit dem Strom schwimmen: Der Transport von Salzionen und einzelsträngiger DNA durch einzelne einwandige Kohlenstoffnanoröhren (CNTs) markiert den Beginn einer neuen Art von Festphasennanoporen. Der Transportprozess hängt deutlich von den elektronischen Eigenschaften der CNTs ab: Zwei CNTs mit gleichem Durchmesser, abe…
Two new types of interdigital capacitors (IDC) are proposed to be used in a novel Composite Right/Left-Handed Transmission Line (CRLH-TL) structure. The LC parameters of the traditional and novel IDC are respectively extracted for comparisons with Ansoft HFSS9 full-wave simulation. In contrast with traditional structu…
Abstract In addition to constructional requirements in civil engineering stainless steels often have to fulfil high visual demands. Unexpected impairments of the visual appearance of stainless steels under low corrosive conditions are a widespread problem today. Frequently it is supposed that this is caused by changes…
The picture shows the results of a temperature-programmed desorption experiment after methanol adsorption on pure ZnO nanoparticles. Two distinguishable methoxy species assigned to ZnO(10-10) and ZnO(000-1) facets are thermally converted into two different formate species. The influence of Au decoration of ZnO is inve…