Materials Literature
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The surface structural characteristics and electronic behavior of three platinum nanoparticle (NP) samples prepared with tertiary amine (Pt-TA), primary amine (Pt-PA), and thiol (Pt-SR) molecules were studied using Pt 4f, 5d, and S 2p x-ray photoelectron spectroscopy (XPS), Pt L(3)-edge x-ray absorption spectroscopy (…
Schiff bases bearing an intramolecular hydrogen bond are known to undergo excited-state intramolecular proton transfer and E-Z isomerization, which are related to their thermochromism and solvatochromism properties. In this study, we explored these ultrafast photoinduced processes for two doubly hydroxylated Schiff ba…
Eine neue Klasse von Cumarin-Rhodamin-Systemen, die auf dem Energietransfer über Bindungen (TBET) beruhen und minimale Überlappung zwischen Donoremission und Akzeptorabsorption aufweisen, zeichnet sich durch große Pseudo-Stokes-Verschiebungen (bis 230 nm) und Emissionsverschiebungen (bis 170 nm) aus. Die Nützlichkeit…
The spontaneous emission rate of erbium ions is enhanced by coupling to localized plasmonic resonances in subwavelength annular apertures in a Au film. The Er3+ ions, embedded in SiO2, are selectively located inside the apertures. The annular apertures act as nanocavities, enhancing the local density of optical states…
Silver dendritic (“fractal”) structures exhibit very high fluorescence enhancement, but their nonuniformity limits practical applications. Here, we present a novel, electroless deposition approach to produce uniform silver dendritic nanostructures on silicon for enhanced fluorescence. These metal-modified surfaces wer…
Amorphous carbon nanofibers (ACNFs) have been synthesized by a thermal chemical vapor deposition technique. The ACNFs grow as two branches perpendicular to {111} facets of a catalytic copper nanoparticle. The carbon nanofibers are composed of disordered localized nanofragments which in turn consist of several graphene…
The electronic states of the graphite surface with platinum clusters have been investigated at the atomic scale by scanning tunneling spectroscopy. The distinct local density of states were observed near the Fermi level for carbon atoms around the Pt clusters, which has been ascribed as nonbonding $\ensuremath{\pi}$ e…
This paper presents recent developments in crystal plasticity modelling to incorporate a non-local crack nucleation criterion and the comparison of experimental observations and model predictions for deformation and crack nucleation in a near-alpha titanium (Ti) alloy polycrystal. The model polycrystal was established…
An Fe,H-ZSM-5 sample (Si/Al ratio of 13.5, Fe concentration of 1.18 wt %) was prepared by liquid ion exchange from solution of FeCl 2 under nitrogen atmosphere at 370 K. When the sample is treated with oxygen at 673 K, iron is mainly in the Fe 3+ state, including (i) Fe 3+ −OH hydroxyl groups monitored in the IR spect…
Phase-change InSbTe (IST) single crystalline nanowires were successfully synthesized at a low temperature of 250 degrees C by metalorganic chemical vapor deposition (MOCVD). The growth of IST nanowires by MOCVD, at very high working pressure, was governed by supersaturation. The growth mechanism of the IST nanowires b…
Ein kleiner Schritt für Ammoniak-Boran: Die einfachste Aminoboranverbindung H2BNH2, die bei der Dehydrierung von Ammoniak-Boran entsteht, wurde mit einem Rutheniumkomplexfragment in Form eines Bis(σ-BH)-Aminoborankomplexes abgefangen. Auch die analogen Komplexe mit H2BNHMe und H2BNMe2 wurden synthetisiert. (Bild: Rut…
It is shown that, within the tight-binding approximation, Fermi-level ballistic conduction for a perimeter-connected graphene fragment follows a simple selection rule: the zero eigenvalues of the molecular graph and of its subgraph minus both contact vertices must be equal in number, as must those of the two subgraphs…
MoO(3) has a unique rigid double-layer structure, which makes it a real challenge to prepare nanotubular structures. The controlled synthesis of MoO(3) single-walled nanotubes (SWNTs) is achieved through a cluster-based self-assembly route on the dodecanethiol/water interface. Various factors are studied at length, in…
Mass transport in liquids and glass is intimately connected to the structure and topology of the disordered network. To investigate this problem, we measure the ionic diffusivity and fragility of a series of iron-bearing alkali-alkaline earth silicate glasses, substituting different types of alkali and alkaline earth…
LaF 3:Ce 3+ -doped nanoparticles were synthesized at different temperatures in dimethyl sulfoxide (DMSO) by the chemical reaction of lanthanum nitrate hydrate and cerium nitrate hexahydrate with ammonium fluoride. The formation of Ce 3+ -doped LaF 3 nanoparticles is confirmed by X-ray diffraction and high-resolution t…
The physical properties of nanoscale materials often vary with their size, unlike the corresponding bulk material properties, which can only be changed by modifying the material composition. In particular, it is believed that hydration phenomena are length scale dependent. The manifestation of hydrophobicity over mult…
The electronic structure of amorphous ZnO film (a-ZnO) was examined by O K- and Zn L3-edge x-ray absorption spectroscopy and valence band photoemission spectroscopy. Comparative studies of a-ZnO and a wurtzite ZnO (w-ZnO) revealed a decrease in Zn 4s-O 2p hybridization strength and the localization of Zn 4s band as a…
Highly oriented tin oxide (SnO 2 ) nanowire network (nanonets) based devices fabricated through photolithography-free techniques are studied. These nanowire networks are studied at submillimeter scales for their utilization as the active material in thin film transistors for macroelectronics. The SnO 2 nanowire networ…
Hexa-peri-hexabenzocoronene derivatives show a record high negative volumetric thermal expansion coefficient within the crystalline phase. Responsible for the negative thermal expansion is the increase of the tilt angle and the improved packing of the discotic cores with temperature and this has implications in the de…
The red to green ratio from upconversion in Yb 3+ and Ho 3+ codoped LaF 3 nanoparticles embedded in a silica matrix can be controlled by careful tuning of the sol−gel process. Red to green ratios of 1:2.3 to 23:1 were observed from the samples that had the same composition of Yb 3+ and Ho 3+ ions codoped LaF 3 nanopar…