Materials Literature
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Judd–Ofelt (J–O) analysis is used to estimate the magnitude of the forced (4f–4f) transition probabilities of Er 3+ ions in double-doped (Er,Yb) : CaF 2 crystals. The studied crystals were grown in our crystal research laboratory using the vertical Bridgman method. The J–O intensity parameters Ω 2 , Ω 4 and Ω 6 were c…
We present the fabrication and characterization of a guided-mode resonance-based high reflector operating in transverse-electric (TE) polarization. This reflector consists of a single periodic layer of amorphous silicon on a glass substrate. It is fabricated by silicon sputtering, holographic interference patterning,…
Abstract The mechanical and orientational properties of IOENs consisting of integrated ellipsoidal SCH spindle‐type nanoparticles within an elastomeric matrix are reported. The influence of the SCH surface chemistry, leading either to dispersed nanoparticles or crosslinked nanoparticles within the surrounding elastome…
Chromium-doped gallium sesquiselenide, Cr:Ga${}_{2}$Se${}_{3}$, is a member of a new class of dilute magnetic semiconductors exploiting intrinsic vacancies in the host material. The correlation among room-temperature ferromagnetism, surface morphology, electronic structure, chromium concentration, and local chemical a…
BACKGROUND: The antitubercular drug, isoniazid (INH), has been conjugated with a bifunctional polyethylene glycol derivative (MW 575) with the objective of designing a novel drug-delivery system that has reduced toxicity compared with the neat drug, without compromising its biological activity. The polyethylene glycol…
Abstract The nonlinear optical (NLO) semiorganic crystals barium thiourea chloride (BTC), bis(thiourea)barium chloride (BTBC) and barium(tetrakisthiourea) chloride (BTTC) were grown by the slow evaporation technique. FT‐Raman and IR spectra of the crystallized NLO materials were recorded and analyzed. The equilibrium…
An in situ optical microspectroscopy study of the surface plasmon resonance (SPR) evolution of Ag nanoparticles (NPs) embedded in thick SiO(2) films deposited on soda-lime glass has been conducted during thermal processing in air. The temperature and time dependences of the SPR were analyzed in the context of Mie exti…
Silver nanowires with diameters of about 100 nm and lengths up to several micrometres have been synthesised by a developed polyol process with the assistance of polyvinyl pyrrolidone (PVP) and sodium chloride (NaCl) on a large scale. Transmission electron microscopy, high-resolution transmission electron microscopy, s…
A method is introduced to measure the effective constitutive parameters of metamaterials having negative permittivity, negative permeability, or negative permeability and negative permittivity simultaneously. The method is based on the strip line topology, thus offering low cost and low setup complexity in comparison…
Lu-modified (Ca 2.94− x Lu x Ce 0.06 )(Sc 2− y Mg y )Si 3 O 12 (CLSMS : Ce 3+ ) yellow emitting phosphors are prepared by a solid-state reaction. Controllable luminescent intensity and emitting colour are studied as a function of Lu and Mg contents. Fixing the Mg content to be 1, the effect of Lu content on crystal ph…
Synthesis of nanomaterials via 'molecular self-assembly' allows one to define the properties of the nanomaterial by rational design of the individual constituents. Use of peptides for self-assembly offers the ease of design and synthesis, and provides higher biofunctionality and biocompatibility to nanomaterials. Our…
We report the electronic structure studies of well-characterized La 0.8 Bi 0.2 Fe 1− x Mn x O 3 (LBFM, 0.0 ⩽ x ⩽ 0.4) multiferroic samples investigated by soft x-ray absorption spectroscopy at O K-, Mn L 3,2 -, Mn K-, Fe L 3,2 - and La M 4,5 -edges along with the spectra of reference compounds. The investigations are…
ZnO grain‐growth kinetics was studied in the ZnO+1 mol% Bi 2 O 3 system with the addition of 0.1 and 0.5 mol% SnO 2 between 950° and 1300°C. It was found that inversion boundaries (IBs) are the major factor influencing the ZnO grain growth in this system. After the nucleation of the IBs in the ZnO grains, these grains…
In this paper, we discuss the development of a bulk negative refractive index metamaterial made of cascaded “fishnet” structures, with a negative index existing over a broad spectral range. We describe in detail the design of bulk metamaterials, their fabrication and characterization, as well as the mechanism of how c…
Biofilm formation on implant materials causes a common problem: resistance to aggressive pharmacological agents as well as host defenses. Therefore, to reduce bacterial adhesion to implant surfaces we propose to use silver(I) coordination networks as it is known that silver is the most powerful antimicrobial inorganic…
Abstract In this study, the particle morphology development at the very initial stage of propylene polymerization using a spherical Mg(OEt) 2 ‐based ZN catalyst was precisely tracked by applying stopped‐flow and short‐time slurry polymerizations. Electron microscope observation and mercury porosimetry derived a compre…
Four ferric phosphate compounds were identified in the Fe 2 O 3 –P 2 O 5 system and the liquidus surfaces in the subsystems Fe 3 PO 7 –FePO 4 , FePO 4 –Fe 4 (P 2 O 7 ) 3 , and Fe 4 (P 2 O 7 ) 3 –Fe(PO 3 ) 3 were determined. The results are significantly different from those presented by Wentrup in 1935. Fe 3 PO 7 is t…
Laterally electrically-pumped Si light-emitting diodes (LEDs) based on truncated nanocrystalline-Si (nc-Si)/SiO2 quantum wells are fabricated with complementary-metal-semiconductor-oxide (CMOS) process. Visible electroluminescence (EL) can be observed under a reverse bias larger than ~6 V. The light emission would pro…
We present a study that identifies the ideal bandgap value in graphene devices, e.g., through size quantization in graphene nanoribbons (GNRs), to enable graphene-based high-performance RF applications. When considering a ballistic graphene GNR-LNA, including aspects like stability, gain, power dissipation, and load i…
Photoluminescence excitation and transmission spectra of Si nanocrystals of different diameters embedded in a SiO${}_{2}$ matrix have been investigated in the broad visible-vacuum ultraviolet spectral range using synchrotron radiation. The dependence of the photoluminescence excitation spectra on the nanocrystals size…