Materials Literature
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The conformational complexity of chain-like macromolecules such as proteins and other linear polymers is much larger than that of point-like atoms and molecules. Unlike particles, chains can bend, twist, and even become knotted. Thus chains might also display a much richer phase structure. Unfortunately, it is not ver…
A major issue in the synthesis of ferrites using the co-precipitation technique is the refinement in the crystal structure. We report in this work for the first time the use of a pulsed Nd:YAG (1064 nm) laser to refine the structure of spinel ferrite using pre-digestion irradiation of the sample. In view of the techno…
Carbon atoms can form structures in one, two and three dimensions due to their unique chemical versatility. In terms of thermal conductivity, carbon polymorphs cover a wide range from very low values with amorphous carbon to very high values with diamond, carbon nanotubes and graphene. Schwarzites are a class of three…
Au+ ions have been successfully incorporated into the lattice of ZnxCd1−xS quantum dots as luminescent centers via an aqueous method. The dopant emission can be tuned in the range of 445 to 570 nm, and the highest quantum yield can reach as high as 30%. Our results showed that Au+ ions can be used as an excellent lumi…
Various carbon based nanostructures (graphene, graphene-CNTs hybrid and three-dimensional (3D) carbon network) have been grown separately on low-temperature (600 ?C) substrates by using a chemical vapor deposition system with a two-heating reactor. The two-heating reactor is utilized to offer sufficient, well-proporti…
Metglas 2826 MB having a nominal composition of Fe40Ni38Mo4B18 is an\nexcellent soft magnetic material and finds application in sensors and memory\nheads. However, the thin-film forms of Fe40Ni38Mo4B18 are seldom studied,\nalthough they are important in micro-electro-mechanical systems/nano-electromechanical\nsystems…
Faceted three-dimensional (3D) AlGaN/AlN multiple quantum wells (MQWs) with semipolar {1￣101} and polar (0001) planes are fabricated by a regrowth technique based on metalorganic vapor phase epitaxy (MOVPE) on trench-patterned AlN templates. Similar 3D microfacet structures with different height are formed on top of a…
A p-i-n solar cell is best suited for strong absorbers with poor collection capabilities. However, the absorption naturally decreases at photon energies close to the electronic bandgap of the semiconductor. We hypothesized that a quasi-periodic surface textures in the role of diffraction gratings at the back contact c…
We report dynamic Monte Carlo simulation on conformational transition of H-shaped branched polymers by varying main chain (backbone) and side chain (branch) length. H-shaped polymers in comparison with equivalent linear polymers exhibit a depression of theta temperature accompanying with smaller chain dimensions. We o…
In this paper we present a dual-wavelength fiber mode-locked laser based on CVD-graphene saturable absorber (SA). The laser setup is based on two ring cavities connected by a common branch with a graphene SA. As a gain media erbium (Er) and thulium (Tm) doped active fiber were used. The laser generate optical pulses c…
Ga-doped ZnO grown at 200 °C by pulsed-laser deposition in Ar ambient and annealed face-down on Zn foil at 500 °C in forming gas can attain near-record electrical characteristics for ZnO: resistivity ρ = 1.23 × 10-4 Ω-cm, mobility μHall = 34.1 cm2/V-s, and free-electron concentration n = 1.4 x 1021 cm-3, leading to a…
Lithium is usually added into the solution to improve ZnO hydrothermal growth; however, lithium doping affects the properties of the resulting crystals. Optical and electrical properties of hydrothermal ZnO bulk crystals without lithium, have been studied by photoluminescence and Hall-effect measurements. High quality…
GaN/AlN quantum dots (QDs) have been observed to emit in deep ultra violet (UV) regime. The emission wavelength can be tuned from 270 nm to 238 nm using GaN growth time and Ga flux. In this work, tunnel injection GaN/AlN QD UV LEDs have been fabricated utilizing polarization doped p-n junctions grown on AlN templates…
Solar energy converters based on organic semiconductors are inexpensive, can be layered onto flexible surfaces, and show great promise for photovoltaics. In bulk heterojunction polymer solar cells, charges are separated at the interface of two materials, an electron donor and an electron acceptor. Typically, only the…
New Yb3+, Er3+ and Tm3+ triply doped fluoro-phosphate glasses belonging to the system NaPO3-YF3-BaF2-CaF2 have been prepared by the classical melt-casting technique. Glasses containing up to 10 wt.% of rare-earth ions fluorides have been obtained and characterized by using differential scanning calorimetry (DSC), UV-v…
Recently, there has been a great amount of interest in nanoparticles which are able to provide a platform with high contrast for multiple imaging modalities in order to advance the tools available to biomedical researchers and physicians. However, many nanoparticles do not have ideal properties to provide high contras…
This work demonstrates metamaterial (MM) selective thermal emitters for potential use with energy harvesting photodiodes, such as thermophotovoltaic cells. Preliminary structures have been designed, simulated, and fabricated using CST Microwave Studio and microfabrication techniques including electron beam evaporation…
The dependence of surface-enhanced fluorescence of the semiconducting polymer poly (3-hexylthiophene) on the diameter of silver nanoparticles was studied. Particle suspensions with a high degree of monodispersity, ranging in diameter from 15 to 153 nm, were synthesized. Polymer films were spin-cast onto substrates con…
We propose and demonstrate a new polarized backlight unit (BLU) configuration to enhance light transmission in a twisted nematic (TN) mode liquid crystal (LC) panel. By adding an optimized phase retardation film (PRF) to the BLU, we efficiently controlled the polarization state of the light from the light guide plate…
In the framework of hot-carrier solar cell absorber material design, we revisit the LO-phonon decay processes in a wide variety of III-V and group IV binary semiconductors. We present a detailed description of the two-phonon final states, from the exact dispersion relation calculated within the Density Functional Pert…