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。
The properties of photovoltaic donor/acceptor blend organic solar cells are highly influenced by several parameters, such as the thickness of the active layers, the morphology of the film due to the solvent, the mobility of the free charge carriers and the electrodes used. In this work, the open-circuit voltage (Voc)…
This paper presents a review of the environmental possibilities of using carbon nanotubes (CNTs) for extracting metals, taken into account the characteristics of carbon nanotubes to be used as adsorbents and the influence of different factors on the adsorption processes, among them: kind of carbon nanotubes used as ad…
CdO thin films have been deposited at different concentration of SnO2 (x= (0.0, 0.05, 0.1, 0.15 and 0.2)) Wt. % onto glass substrates by pulsed laser deposition technique (PLD) using Nd-YAG laser with λ=1064nm, energy=600mJ and number of shots=500. X-ray diffraction (XRD) results reveal that the deposited (CdO)1-x(SnO…
In the present investigation, bromoborosilicate glass of composition 6Na2O-19K2O-10BaBr2- 2Al2O3-15B2O3-48SiO2 (mole %) added with 0.2 wt% SnO, co-doped with 0.001 wt% Ag and 0.7 wt% Er2O3 in excess amount, was prepared by melt-quench technique. The metal-glass nanocomposites were derived involving a single-step in-si…
The aim of this study was to investigate the photocatalytic activity of polycrystalline phases of bismuth tungstate of formula Bi2WO6. Polycrystalline samples were elaborated using a coprecipitation technique followed by a calcination process at different temperatures (300, 400, 600 and 900°C). The obtained polycrysta…
The Spectral Characterization of (E)-5-(2-phenyldiazenyl)-2-hydroxy benzaldehyde (PDHB) were carried out by using FT-IR, FT-Raman and UV-Vis spectroscopic techniques. All the recorded spectral results were compared with calculated results. The optimization has been performed on the title compound using B3LYP/6-311++G(…
When a particle beam travels through an accelerator structure like the LHC, energy is lost to the structure itself. This phenomenon is described through the beam-coupling impedance and is ideally reduced to improve beam quality and energy efficiency. In this paper, the use of metamaterials with negative permeability i…
We have studied the effect of a high photonic density of states provided by a metamaterial environment on the dynamics of nanodiamond based nitrogen-vacancy (NV) centers. We have experimentally demonstrated the broadband enhancement of single-photon emission from nanodiamond NV centers coupled to a planar multilayer m…
Recently, split-ring resonators (SRRs) have been studied as the receiving element for electromagnetic energy harvesting, or RF energy harvesting, for its electrically small size and electric field concentration at resonance. However, traditional single-ring SRR studied in literature possesses intrinsic single bandwidt…
We examine the excitation of resonant modes inside eccentrically layered cylindrical active nano-particles. The nano-particle is a three-layer structure comprised of a silica core, a free-space middle layer, and an outer shell of silver. It is shown that a concentric configuration, initially designed to excite e.g., a…
A numerical technique for modeling of devices based on graphene nanostructures at microwave, THz and IR frequency ranges by using rigorous mathematical models to solve the 3D diffraction boundary problems is developed. The models are based on the solution of full set of Maxwell`s equations with electrodynamic boundary…
We present a complete methodology for the design of Huygens metasurfaces (HMS), structures combining electric and magnetic polarizable particles to tailor the fields on their aperture based on the equivalence principle. This includes a semianalytical spectral formalism to design metasurface radiators for a variety of…
In this paper we present our recent work on plasmonic color printing using metallic nanostructures. This is a new form of structural color where colors arise due to the local resonances of metallic nanostructures instead of diffractive effects. These metal nanostructures combined with a backreflector support plasmon r…
By combining the zoning technique with the strong dispersion of the fishnet metamaterial, a broadband fishnet diffractive optical element is designed, fabricated and measured at millimeter-waves. Diffraction-limited full width at half maximum ~0.8λ0is demonstrated experimentally when the focal properties of the lens a…
We report on the results of numerical simulation of the effect of electric field redistribution in the insulating gap of the open TiN–SiO 2 –W metal–insulator–metal “sandwich” structure upon the formation of an insulating film layer with an elevated permittivity at the free end as a result of absorption of moisture by…
Abstract In this paper, we demonstrate an alternative approach to fabricating an electrically tunable holographic polymer‐templated blue phase liquid crystal grating. This grating is obtained by preforming a polymer grating template, and then refilling it with the blue phase liquid crystal. Compared with conventional…
When reflectarray antennas are designed under the local periodicity assumption, the problem of the scattering of plane waves by multilayered periodic structures has to be solved many times. The Method of Moments (MoM) in the spectral domain is the numerical technique usually employed for the analysis of these multilay…
Abstract Temperature dependence of dielectric properties of nematic liquid crystals are investigated for two types of devices: wide temperature range liquid crystal displays and capacitor temperature sensor.
A truly 3D “miniature optical lab” for molecule detection is achieved by S. Feng, Y. Zhang, and co-workers on the tip of an optical fiber. It is designed like a radar configuration: excited light is focused on the globular “cactus” by a parabolic mirror to excite the SERS of the molecules. On page 1232, these SERS sig…
O uso de plantas na medicina popular é amplamente expandido no Brasil, tendo sua base na tradição familiar durante muito tempo como a única alternativa para o tratamento de várias doenças, cujas plantas são consumidas com pouca ou nenhuma comprovação de suas propriedades farmacológicas. São cada vez mais frequentes es…