Materials Literature
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Tungsten oxide powders with controlled micro‐to‐nanoscale features, i.e. from microspheres to mesoporous structure, have been synthesized using peroxopolytungstic acid (PTA) and thiourea. Using PTA alone, elliptical tungsten oxide microspindles are hierarchically assembled from rectangular nanoparticles (NPs) after he…
Resonant magnetic soft x-ray diffraction is used to study the magnetic order of the Mn sublattices in multiferroic ${\text{ErMn}}_{2}{\text{O}}_{5}$. Data were collected at the $\text{Mn}\text{ }{L}_{2,3}$ edges as a function of temperature, incident polarization, including the analysis of scattered polarizations for…
Resonance Raman spectroscopy measurements of lysozyme-bound single-walled carbon nanotubes have been made during different stages of the chemically and thermally induced misfolding and of the denaturation process of nanotube-bound lysozymes. Changes to the Raman intensity of single-walled carbon nanotubes (SWNTs) have…
Adsorption of the hydrocarbon radicals CH, ${\text{CH}}_{2}$, and ${\text{CH}}_{3}$ on finite single walled carbon nanotubes (SWNTs) of the (10,0) type is investigated by density-functional theory (DFT). Two classes of finite SWNTs are considered: truncated SWNTs, where admission is made for geometric reconstruction o…
Glass samples belonging to x Gd 2 O 3 ·(1− x )[0.857Bi 2 O 3 ·0.143GeO 2 ] system, with 0.005≤ x ≤0.1, have been prepared by the rapid quenching method. Glass–ceramics were obtained after heat treatment of the as‐prepared glasses at 600°C for 24 h. All samples have been structurally characterized by X‐ray diffraction…
Analytical expressions for dipole matrix elements describing interband optical transitions in carbon nanotubes are obtained for arbitrary light polarization and nanotube chiralities. The effect of the symmetry with respect to the time reversal on the dependences of the optical matrix elements on the quantum numbers of…
Taking advantage of the photobleaching and co-initiating properties of the dendritic thioxanthone (TX) photoinitiator, we developed a general and facile approach to fabricate patterned binary polymer brushes by combining photolithography and surface-initiated photopolymerization (SIPP). The dendritic TX photoinitiator…
The high‐yield synthesis of network‐like branched silicon nitride (Si 3 N 4 ) nanostructures by a simple template catalyst‐assisted pyrolysis of a polymer precursor, perhydropolysilazane, was reported. The templates were silicon wafers deposited with Fe films of 5–20 nm in thickness. The processes simply involved ther…
This work presents photoelectrochemical characteristics of TlVO 4, a previously uncharacterized candidate for photocatalytic water splitting. Additionally, a composite of InVO 4 and TlVO 4 was synthesized by a facile solution method using orthorhombic InVO 4 as a seed for growth of crystallographically similar orthorh…
We demonstrate a mechanism to intrinsically stabilize a hollow shell composed of individual nanoparticles. Using Monte Carlo simulations, we show that if nanoparticles that interact via short-range attraction and long-range repulsion are assembled on a template, the resulting shell can be stabilized upon the removal o…
Lead‐free piezoelectric ceramics with formula (Li 0.12 Na 0.88 ) (Nb 1− x % Sb x % )O 3 were prepared by the conventional solid‐state reaction method. The effects of Sb 5+ doped into (Li 0.12 Na 0.88 ) NbO 3 B site were studied. Within the selected compositional range, all the samples have a single perovskite structur…
Er 3+ /Yb 3+ ‐codoped Y 2 O 3 transparent ceramics were fabricated and characterized from the point of up‐conversion luminescence. All the samples exhibit high transparency not only in the near‐infrared band but also in the visible region. Under 980 nm excitation, the ceramics gave up‐conversion luminescence with very…
Tin‐doped indium oxide (ITO) nanopowders with 90±3 and 40±3 nm particle size were prepared by the urea‐based hydrothermal under a low‐pressure method. The sintering behavior of the as‐prepared ITO powder was studied at temperature from 1200° to 1500°C. The sintered ITO targets with large dimensions of 500 mm × 300 mm…
Infrared transparent glass–ceramics have been prepared in the system GeS 2 –Sb 2 S 3 –CsCl using spark plasma sintering in shorter times in comparison with conventional thermal treatments. The combined effects of pressure, time, and temperature allow the controlled crystallization of Cs‐based crystals. The different g…
The surface-enhanced Raman scattering (SERS) effect and sensor and biosensor analyses are widely applied to investigate drug-biomolecule interactions or to detect trace amount of analytes. In this work, surface-enhanced resonance Raman scattering (SERRS) and an electronic tongue system using impedance spectroscopy wer…
The synthesis of three novel thiophene-based conjugated molecules ( 1 − 3 ) is presented. We report the electronic and redox properties of these compounds along with the corresponding electrochemically prepared polymers. The structures of compounds 1 and 2 have been confirmed by single-crystal X-ray diffraction studie…
We present ultrawide flat-band reflectors enabled with multilevel resonant leaky-mode structures. The reflectors are designed using particle swarm optimization. We show that three-level silicon-on-insulator structures provide bandwidths of approximately 840 nm for TE polarization and approximately 835 nm for TM polari…
The conversion of silicon‐based polymers into a ceramic occurs by the release of small organic molecules at intermediate temperatures, and hydrogen at the higher temperatures. The conversion is accompanied by significant densification. In order for the body to emerge without fracture damage, the shrinkage must be acco…
The characteristics of suspended graphene membran structures formed by partial etching underneath SiC were revealed by using atomic force microscopy. The contact force dependence of topographic and electrical conductance images were measured with a metal (Rh) coated microprobe. The contact resistance value for locally…
Imaging with a layered superlens is a spatial filtering operation characterized by the point spread function (PSF). We show that in the same optical system the image of a narrow subwavelength Gaussian incident field may be surprisingly dissimilar to the PSF, and the width of the PSF is not a straightforward measure of…