Materials Literature
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Saturable and reverse saturable absorption at longitudinal surface plasmon resonance (SPR) in gold nanorods (Au NRs) have been observed using Z-scan and transient absorption techniques with femtosecond laser pulses. At lower excitation irradiances, the wavelength dispersion of saturable absorption has been determined…
Optical Kerr nonlinearity (n2) in n-type indium tin oxide (ITO) films coated on glass substrates has been measured using Z-scans with 200-fs laser pulses at wavelengths ranging from 720 to 780 nm. The magnitudes of the measured nonlinearity in the ITO films were found to be dependent on the carrier concentration with…
Abstract The electronic structure and equilibrium geometry of La 2/3 Sr 1/3 MnO 3 are studied theoretically by means of density functional calculations. The doping is treated by introducing holes and a compensating jellium background. The results for the local density approximation (LDA) agree with previous LDA calcul…
Uniform V(2)O(5)· xH(2)O nanobelts with high aspect ratios and ultra-long V(2)O(5)· xH(2)O nanorolls with novel scroll-like structures were synthesized on a large scale by a simple hydrothermal growth route using NH(4)VO(3) as the raw material in the presence of different acids at 180 °C for 24 h. Their morphologies w…
Cubic boron nitride ($c$-BN) is the second (only to diamond) hardest material with superior thermal stability. Despite its wide range of applications as a superhard material, the structural deformation modes of $c$-BN at the atomistic level are still not well understood. In this paper, we report first-principles calcu…
Molecular self-assembly offers unique directions for the fabrication of novel supramolecular structures and advanced materials. The inspiration for the development of such structures is often derived from self-assembling modules in biology, as natural systems form complex structures from simple building blocks such as…
We present a new class of artificial materials which exhibit a tailored response to the electrical component of electromagnetic radiation. These electric metamaterials (EM-MMs) are investigated theoretically, computationally, and experimentally using terahertz time-domain spectroscopy. These structures display a reson…
The crystal and magnetic structures of the orthorhombic e-Fe2O3 have been studied by simultaneous Rietveld refinement of X-ray and neutron powder diffraction data in combination with Mossbauer spectroscopy, as well as magnetisation and heat capacity measurements. It has been found that above 150 K the e-Fe2O3 polymorp…
A quantum leap in glucose sensing: Commercially available fluorescent quantum dots are used in combination with boronic acid modified viologens to sense glucose in aqueous solution. The signal response is optimized by adjusting the ratio of quantum dots to viologen quencher.
Abstract Summary: Dispersing surface‐modified zinc oxide nanoparticles (ZnO) in methyl methacrylate (MMA) improves the free radical bulk polymerization process as well as the thermal stability of the formed polymer. Hydroxy groups available on the ZnO surface may induce a degenerative transfer. This suppresses the gel…
Abstract Highly uniform single‐crystal Na‐OMS‐2 (OMS: octahedral molecular sieve), pyrolusite, and γ‐MnO 2 nanostructures with an interesting 3D urchinlike morphology have been successfully prepared using a hydrothermal method based on a mild and direct reaction between sodium dichromate and manganese sulfate. The cry…
High performance organic light-emitting diodes (OLEDs) were implemented on transparent and conductive single-wall carbon nanotube sheets. At the maximum achieved brightness of 2800cdm−2 the luminance efficiency of our carbon nanotube-based OLED is 1.4cdA−1 which is comparable to the 1.9cdA−1 measured for an optimized…
We investigate the flowing behavior of dense suspensions of noncolloidal particles, by coupling macroscopic rheometric experiments and local velocity and concentration measurements through magnetic resonance imaging (MRI) techniques. We find that the flow is localized at low velocities, and that the material is inhomo…
As a first step towards gaining microscopic understanding of copper-based catalysts, e.g., for the low-temperature water-gas shift reaction and methanol oxidation reactions, we present density-functional theory calculations investigating the chemisorption of oxygen, and the stability of surface oxides on $\mathrm{Cu}(…
The polymer‐based synthesis of ceramics such as SiCO (and SiCN) leads to the incorporation of significant amounts of carbon into their molecular structure. A key feature of the nanostructure of these polymer‐derived ceramics is the revelation of persistent, 1–5 nm size domains by small‐angle X‐ray scattering. Here we…
Recent material developments of fast solid oxide and lithium ion conductors are reviewed. Special emphasis is placed on the correlation between the composition, structure, and electrical transport properties of perovskite-type, perovskite-related, and other inorganic crystalline materials in terms of the required func…
Worthy of merit: The new class of nanostructured p-type thermoelectrics Na1−xPbmSbyTem+2 is reported. The exceptionally high thermoelectric figures of merit ZT of these materials (see graph), which exceed those of the state-of-the-art materials PbTe and (GeTe)1−x((Ag2Te)1−y(Sb2Te3)y)x (TAGS), derive from their very lo…
Electrospinning is a remarkably simple method for generating nanofibers of polymers. When combined with conventional sol–gel processing, it provides a versatile technique for producing ceramic nanofibers with either a solid, porous, or hollow structure. This article presents a brief overview of recent progress in prep…
Nanocrystalline Ni–NiAl 2 O 4 –YSZ cermet with a possible application as anode in solid oxide fuel cells (SOFCs) has been developed. The powders were prepared by using an alternative solid-state method that includes the use of nickel acetylacetonate as an inorganic precursor to obtain a highly porous material after si…
Low-frequency Raman spectra of densified silica glasses, annealed at different temperatures and possessing various densities, are studied. The dependence of the fast relaxation intensity versus the density can be described by linear laws below and above the density 2.26 g cm −3 , but the slope of the linear law below…