Materials Literature
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Einzelmolekülmagnete: Ein quadratisch-pyramidaler Dysprosium-Cluster mit fünf Metallzentren (siehe Bild) zeigte langsames magnetisches Relaxationsverhalten bei Temperaturen bis 40 K. Die thermische Energiebarriere für die Magnetisierungsrelaxation dieses Einzelmolekülmagneten ist 530 K; es ist damit die höchste Barrie…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Facile Construction of Supramolecular Complex from Polyaniline and Cellulose in Aqueous SystemXingwei Shi†, Lina Zhang*†, Jie Cai†, Gongzhen Cheng†, Hongming Zhang‡, Ji Li‡, and Xianhong Wang‡View Author Information† Department of…
Graphene transistors are of considerable interest for radio frequency (rf) applications. High-frequency graphene transistors with the intrinsic cutoff frequency up to 300 GHz have been demonstrated. However, the graphene transistors reported to date only exhibit a limited extrinsic cutoff frequency up to about 10 GHz,…
Abstract The synthesis of ultrabright fluorescent mesoporous silica nanoparticles (UFSNPs) of various sizes loaded with different amounts of fluorescent dye (Rhodamine 6G) is reported here. The dye is physically entrapped inside the nanochannels of the silica matrix created during templated sol–gel self assembly. Due…
Abstract Transparent glass‐ceramics containing Ln 3+ ‐doped YF 3 nanocrystals are successfully obtained under adequate thermal treatment of precursor sol–gel glasses for the first time, to the best of our knowledge. Precipitation of YF 3 nanocrystals is confirmed by X‐ray diffraction and high‐resolution transmission e…
Alkylamines were recently found to be suitable ligands for CdSe quantum dots with respect to applications in polymer/nanoparticle solar cells. However, the physical origin of the superior performance with respect to more widely used pyridine-capped quantum dots still remains unclear. Here, we report about the details…
Kontrollierte Anregung: Das Anlegen einer relativ niedrigen Vorspannung an das Titelsystem führt zu einer deutlichen Verstärkung der Upconversion-Emission. Darüber hinaus kann die Photolumineszenz(PL)-Intensität durch ein elektrisches Wechselstromfeld moduliert werden (siehe Bild). Dieser Ansatz bietet eine dynamische…
Porous silicon samples have been reduced in nanometric particles by a well known industrial mechanical process, the ball grinding in a planetary mill; the process has been extended to crystalline silicon for comparison purposes. The silicon nanoparticles have been studied by X-ray diffraction, infrared spectroscopy, g…
The interaction between proteins and the surfaces of inorganic materials is of paramount importance in natural systems. In recent years, the scope of polypeptide–surface interactions has been enlarged in different directions also in synthetic systems toward technological contexts. Despite the pivotal role of protein–s…
Fusion reactions of size-selected linear polyyne molecules, C 10 H 2, in the ultrathin one-dimensional (1D) nanospace of double wall carbon nanotubes (DWCNTs) have been observed, leading to the formation of very long linear carbon chains. The formation and growth of long linear carbon chains is investigated by Raman s…
Hysteretic giant magnetoimpedance (GMI) of amorphous ribbons with a well-defined transversal domain structure is investigated by means of first-order reversal curves (FORC) analysis. The FORCs are not confined to the hysteretic area, exceeding the major curve amplitude. Irreversible switches of the transverse permeabi…
The use of nanostructured yolk-shell materials offers a way to discriminate support and particle-size effects for mechanistic studies in heterogeneous catalysis. Herein, gold yolk-shell materials have been synthesized and used as model catalysts for the investigation of support effects in CO oxidation. Carbon has been…
Carbon electronics based on carbon nanotube array field-effect transistors (AFETs) and 2-D graphene field-effect transistors (GFETs) have recently attracted significant attention for potential RF applications. Here, we explore the ultimate RF performance potential for these two unique devices using semiclassical balli…
We show using molecular dynamics simulation that spatial confinement of water inside carbon nanotubes (CNTs) substantially increases its boiling temperature and that a small temperature growth above the boiling point dramatically raises the inside pressure. Capillary theory successfully predicts the boiling point elev…
Just add water: Tl(TCNQ) polymorphs with very different charge-transport properties have been isolated, one of which undergoes a remarkable crystal-to-crystal phase transition to the second phase when exposed to ambient water vapor (see picture; TCNQ=tetracyanoquinodimethane).
Fundamental optical properties of thin films of the (Ga,Mn)As diluted ferromagnetic semiconductor with low ($1%$--$2%$) and high ($4%$--$6%$) Mn content and of a reference GaAs film, grown by low-temperature molecular-beam epitaxy, have been investigated by photoreflectance (PR) spectroscopy. In addition, the films we…
Nanoindentation techniques recently developed to measure the mechanical response of crystals under external loading conditions reveal new phenomena upon decreasing sample size below the microscale. At small length scales, material resistance to irreversible deformation depends on sample morphology. Here we study the m…
Some possible applications of the low-angle mid-IR-light scattering technique and some recently developed on its basis methods for non-destructive inspection and investigation of semiconductor materials and structures are discussed in the paper. The conclusion is made that the techniques in question might be very usef…
Based on recent advances in first-principles theory, we develop a general model of the band offset at metal/ferroelectric interfaces. We show that, depending on the polarization of the film, a pathological regime might occur where the metallic carriers populate the energy bands of the insulator, making it metallic. As…
We have studied the temperature dependence of crystal and magnetic structures of the Jahn-Teller distorted transition metal difluorides CrF$_2$ and CuF$_2$ by neutron powder diffraction in the temperature range 2-280 K. The lattice parameters and the unit cell volume show magnetoelastic effects below the Néel temperat…