Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We present a Raman scattering study of wurtzite $\mathrm{ZnO}$ over a temperature range from 80 to $750\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Second-order Raman features are interpreted in the light of recent ab initio phonon density of states calculations. The temperature dependence of the Raman intensities allows t…
Layered graphite oxide is used as host material for the synthesis of conducting polymer intercalated nanocomposites. Powder X-ray diffraction, Fourier transform infrared, and UV-VIS absorption spectra indicate the formation of polyaniline within the interlamellar spaces of graphite oxide. The red shift of UV-VIS absor…
Bimetallic Ag-Au nanoparticles are synthesized by sequential deposition of Au and Ag on amorphous silica by Radio Frequency (RF)-sputtering under mild conditions. Specimens are thoroughly characterized by a multi-technique approach, aimed at investigating the system properties as a function of the Ag/Au content, as we…
Practical protocols are presented to reproducibly prepare micrometer-sized Au(111) substrates. Au(111) terraces of micrometer dimensions and atomic smoothness were crystallized by flame-annealing vacuum-deposited gold films on glass and on millimetric amorphous gold shots. Gold films and shots that were slowly cooled…
Electronic structure and magnetic properties of CoS2 with a cubic-pyrite-type structure have been studied by a first-principles density functional theory (DFT) calculation using a linear muffin-tin orbital method within the framework of the generalized gradient approximation for the treatment of exchange-correlation e…
Ferromagnetic III–Mn–V semiconductors such as GaMnAs represent systems in which electronic and magnetic properties are closely intertwined, which results in entirely new effects in electrical transport. We illustrate this by the unique and somewhat unexpected magnetotransport phenomena observed in GaMnAs films grown o…
Novel composites for supercapacitors: Carbon–Ru nanocomposites with mesoporous structures and homogeneously dispersed Ru nanoparticles in the carbon matrix (see SEM and TEM images), obtained by a simple pyrolysis procedure, display capacitive properties for supercapacitors.
We have investigated the fluorescence properties of dendrimers (Gn is the dendrimer generation number) containing four different luminophores, namely terphenyl (T), dansyl (D), stilbenyl (S), and eosin (E). In the case of T, the dendrimers contain a single p-terphenyl fluorescent unit as a core with appended sulfonimi…
The praseodymium-aluminum perovskite−praseodymium oxide, PrAlO 3 −Pr 2 O 3, eutectic has been studied. The growth of the eutectic by the micro-pulling down method is presented. The PrAlO 3 −Pr 2 O 3 is not air-stable. The cause of the eutectic instability is the instability of the Pr 2 O 3 phase. When exposed to air,…
In this work, we present the size-controlled preparation of silica-filled micelle cores and their self-assembly behavior, which is dependent on the block lengths, different coating techniques, and substrates. Furthermore, we present a way to use these structures as templates for highly ordered magnetic nanostructures,…
Polyaniline (Pani) thin films doped with camphor sulfonic acid (CSA) have been deposited on glass substrates using the spin coating technique. Pani is chemically synthesized by an oxidation method at ∼0 °C. Pani-CSA films show a hexagonal structure in scanning electron micrographs, which occurs due to the crystalline…
Chitosan was used to encapsulate both CdSe/ZnS quantum dots (QDs) and the magnetic resonance imaging (MRI) contrast agent gadolinium-diethylenetriaminepentaacetate (Gd-DTPA), forming multi-functional nanoparticles that can be used in a wide range of in vitro or in vivo studies as fluorescent biological labels as well…
High Resolution Image Download MS PowerPoint Slide The growth of single-walled carbon nanotubes (SWNTs) in a chemical vapor deposition (CVD) system is a complex process. In a typical growth mechanism, the process includes the nucleation stage, the growth stage, and the termination stage. However, most nanotube growth…
High Resolution Image Download MS PowerPoint Slide Recent experimental observations of multiexciton recombination in colloidal CdSe quantum dots have revealed a high-energy emission band that has been attributed to the radiative recombination of a p-like electron with a p-like hole in a triexciton complex (three holes…
To understand the roles of hydroxyl-containing biomolecules in biosilicification, theoretical and experimental studies of silica formation utilizing biological and model organic additives have been undertaken. However, the role of hydroxyl functionalized biomolecules in silica formation is still not fully understood.…
The charge state and local ordering of Mn doped into a pulsed laser deposited single-phase thin film of ZnO are investigated by using x-ray absorption spectroscopy at the O K-edge, Mn K-edge and L-edge, and x-ray emission spectroscopy at the O K-edge and Mn L-edge. This film is ferromagnetic at room temperature. EXAFS…
A variety of density functional methods have been evaluated in the computation of electronic g-tensors and molybdenum hyperfine couplings for systems ranging from the Mo atom through MoIIIN, [MoVOCl4]-, and [MoVOF5]2- to two larger MoV complexes MoXLCl2 (X=O, S; L=tris(3,5-dimethylpyrazolyl)hydroborate anion). In part…
Our first-principles computations show that the ground state of PbTiO3 under hydrostatic pressure transforms discontinuously from P4mm to R3c at 9 GPa. Spontaneous polarization decreases with increasing pressure so that the R3c phase transforms to the centrosymmetric Rc phase at around 27 GPa. The first-order phase tr…
Two biosynthetic routes for the synthesis of pyridoxal 5'-phosphate (PLP), the biologically active compound of vitamin B6, have been characterized. The major pathway leads to direct formation of PLP from a pentasaccharide and a trisaccharide and is operative in plants, fungi, protozoa, and bacteria. This reaction is c…
A simple, direct route to preparation of surface immobilized hydrogel films is described. Specifically, low pressure RF pulsed plasma polymerization of 1-amino-2-propanol and 2-(ethylamino)ethanol monomers produced thin hydrogel films deposited on substrates located in the plasma reactor. The successful syntheses were…