Materials Literature
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Lack of a bandgap is one of the significant challenges for application of graphene as the active element of an electronic device. A bandgap can be induced in bilayer graphene by application of a potential difference between the two layers. The simplest geometry for creating such a potential difference is two overlayed…
We separate localization and interaction effects in epitaxial graphene devices grown on the C face of an ${8}^{\ifmmode^\circ\else\textdegree\fi{}}$-off-axis 4$H$-SiC substrate by analyzing the low-temperature conductivities. Weak localization and antilocalization are extracted at low magnetic fields, after eliminatio…
We introduce a model comprehensively describing the optical features of amorphous silicon dioxide ($a$-SiO${}_{2}$) in the spectral range from $~$8 up to $~$11 eV. Our model is grounded on the critical analysis of the temperature dependence of Kramers-Kronig-derived absorption spectra in the range from $~$8 up to $~$1…
A mechanism of dual enlargement of gold nanoparticles (AuNPs) comprising two steps is described. In the first step, the AuNPs are enlarged by depositing Au atoms on their crystalline faces. In this process, the particles are not only enlarged but they are also observed to multiply: new Au nuclei are formed by the budd…
The synthesis of the nanoscaled bismuth oxido clusters [Bi(38)O(45)(NO(3))(20)(DMSO)(28)](NO(3))(4)·4DMSO (1a) and [Bi(38)O(45)(OH)(2)(pTsO)(8)(NO(3))(12)(DMSO)(24)](NO(3))(2)·4DMSO·2H(2)O (2) starting from the basic bismuth nitrate [Bi(6)O(4)(OH)(4)](NO(3))(6)·H(2)O is reported herein. Single-crystal X-ray diffractio…
Irradiations are known to decrease the thermal conductivity of ceramics. This phenomenon is tackled by molecular dynamics simulation of the thermal resistance of point defects in cubic silicon carbide. The additional thermal resistivity due to point defects proves to vary linearly with their concentration. Large varia…
Aerogel materials have myriad scientific and technological applications due to their large intrinsic surface areas and ultralow densities. However, creating a nanodiamond aerogel matrix has remained an outstanding and intriguing challenge. Here we report the high-pressure, high-temperature synthesis of a diamond aerog…
The magnetic entropy change (ΔSM), temperature of peak ΔSM (Tpk) and refrigerant capacity (RC) in Fe(RE)80B12Cr8 (RE=La, Ce, or Gd) alloys were studied. Increasing La, Ce, and Gd content led to relatively constant, decrease, and increase in Tpk, respectively. Both the phenomenologically constructed universal curve for…
Shiny, HAp(py) crystals: Luminescent, colloidal, F-substituted, hydroxyapatite (FHAp) nanocrystals have been synthesized by rare-earth-ion doping, which showed green emission in solutions and films and red emission in a polymer matrix. Due to the wide availability and excellent mechanical and biologically compatible p…
The development of biosensors using electrochemical methods is a promising application in the field of biotechnology. High sensitivity sensors for the bio-detection of proteins have been developed using several kinds of nanomaterials. The performance of the sensors depends on the type of nanostructures with which the…
Catalytic performances and the reaction mechanism of Co(3)O(4)/AC (AC=activated carbon) for aerobic oxidation of alcohols carried out in the liquid phase were investigated. Co(3)O(4)/AC shows a high activity for aerobic oxidation of benzyl alcohol, comparable to noble metal catalysts (e.g., Au/AC) even in the absence…
Nerve-gas detection: An azo dye with pyridine and aniline moieties can selectively detect diethylcyanophosphonate (DCNP) from diisopropylfluorophosphate (DFP) and diethylchlorophosphate (DCP) by colour changes. Upon addition of DFP and DCP a phosphorylation in the pyridine occurs with a colour change from orange to ma…
We present a $^{77}\mathrm{Se}$ NMR study of the newly discovered iron selenide superconductor ${\mathrm{K}}_{y}{\mathrm{Fe}}_{2\mathrm{\text{\ensuremath{-}}}x}{\mathrm{Se}}_{2}$, in which ${T}_{c}=32\text{ }\text{ }\mathrm{K}$. Below ${T}_{c}$, the Knight shift $^{77}K$ drops sharply with temperature, providing stron…
Two europium complexes with bis(bipyridine) azamacrocyclic ligands featuring pendant arms with or without π-conjugated donor groups are synthesized and fully characterized by theoretical calculations and NMR spectroscopy. Their photophysical properties, including two-photon absorption, are investigated in water and in…
Abstract A simple and efficient method for synthesizing a range of hybrid nanocomposites based on a core of silica nanospheres (160, 330, and 660 nm in diameter) covered by an outer shell of superparamagnetic nanoparticles, either iron oxide or heterodimeric FePt‐iron oxide nanocrystals, is presented. The magnetic and…
Solution blowing of soy protein (sp)/polymer blends was used to form monolithic nanofibers. The monolithic fibers were blown from blends of soy protein and nylon-6 in formic acid. The sp/nylon-6 ratio achieved in dry monolithic nanofibers formed using solution blowing of the blend was equal to 40/60. In addition, solu…
We have studied the changes in the ferromagnetic behavior of graphite powder and graphite flakes after treatment with diluted sulphuric acid. We show that this kind of acid treatment enhances substantially the ferromagnetic magnetization of virgin graphite micrometer size powder as well as in graphite flakes. The anis…
The lowest electronic excitations of benzene and a set of donor-acceptor molecular complexes are calculated for the gas phase and on the Al(111) surface using the many-body Bethe-Salpeter equation (BSE). The energy of the charge-transfer excitations obtained for the gas phase complexes are found to be around 10% lower…
Using a combination of local-spin-density and Hubbard 1 approximations, we study the mechanism of exchange interaction in Eu$X$ ($X=\text{O}$, S, Se and Te). We reproduce known experimental results with regard to bulk modulus, critical pressure for structural phase transition, magnetic ordering temperature, spin-wave…
A new compound based on the Wells–Dawson polyoxometalate, Ag 7 (bbi) 5 (OH)(P 2 W 18 O 62 ) (bbi = 1,1′-(1,4-butanediyl)bis(imidazole)) ( 1 ), has been hydrothermally synthesized and characterized by the normal physical methods and single-crystal X-ray diffraction. Compound 1 represents the first interpenetrating fram…