Materials Literature
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Uniformly-sized cylindrical pores on polycarbonate thin membranes were prepared using the nuclear fission reaction (nf) and chemical etching methods. A triuranium octoxide (U3O8)-coated plate was attached to commercial polycarbonate sheets before being bombarded with thermal neutrons (flux of 8.9 × 109 n cm-2 s-1) fro…
We have observed the formation of periodic surface structures on Ni-Fe film irradiated by a single femtosecond laser pulse. We propose that this is due to the modulated transient permittivity and the surface plasmon.
We have investigated the influence of the modes of adaptive pulse-arc welding and surfacing on the structure and physical-mechanical properties of welded joints of steel 09Mn2Si and the surfaced composition of this steel coated with a modified powder material of chromium carbide with the submicrocrystalline structure.…
In this paper, a high efficient and accurate impact tester for measuring the dynamic strength of diamond grit is presented. The tester uses drop-hammer impact energy to automatically break the diamond grit, and to detect the broken energy and return signals. Compared with the original tester, the newly developed teste…
Synthesis of carbon fibers of cotton by chemical vapor deposition (CDV) method is the main focus of this study. Having ferocene as the catalyst, the study explored effects of synthesis process at different temperatures (750°C, 850°C and 950°C). Analysis of size, shape and structure were conducted using scanning electr…
Tensile strain of Ge-on-Si with post-growth annealing was analyzed using micro-Raman for optical sources in interconnection system. Tensile Stain in epi-Ge distributed non-linearly with SiGe alloy formation at the interface after annealing.
We designed a high-transmittance dielectric/Ag/ITO electrode for high-efficiency GaN-based light-emitting diodes by using the scattering matrix method. The optimized multilayer dielectric/Ag/ITO electrode yielded a transmittance of > 0.90 with an approximately 10-nm-thick Ag layer.
We report an efficient Förster resonance energy transfer (FRET) realized in biopolymer thin films. Via FRET, shorter wavelengths of solar light are down-shifted which may result in enhanced light absorption by Si solar cells.
Synthesis of nanoCu/ZnO catalyst for LPG production was prepared by ultrasonic spray pyrolysis (USP). Hollow spherical particles were obtained by USP technique using an aqueous solution of Cu (NO3)3.6H2O and Zn (NO3)3.3H2O with different concentration of 0.05, 0.1 and 0.5 molar under the pyrolysis temperatures of 600,…
We performed photoluminescence (PL) and Raman spectroscopy for Cl2and H2plasma modified monolayer MoS2(1L-MoS2) crystals. We demonstrated that PL intensities in 1L-MoS2can be tuned by treating Cl2and H2plasma.
A low-loss all-semiconductor metamaterial-based optical circuit board with optical inductors, capacitors, insulators and conductors at the microscale is proposed, which can always hold band-stop filtering function for various polarized waves.
This study examined the electrical and optical characteristics of GaN-based vertical-injection light-emitting diodes (VI-LEDs) with various numbers of via holes.
The paper describes the optimization procedure supporting the designing process of geometry of gradient coatings basing on numerical simulation of internal stress and strain distributions in the coating and substrate. In mathematical model the gradient coating is represented by the so-called transition functions descr…
Recent advances in high power beam conversion in diamond are reviewed. It is shown that there are excellent prospects for developing high power (kilowatt) devices with diffraction-limited beam quality in bulk and at room temperature.
We present ultrafast optical studies of the Dirac surface dynamics in a topological insulator Bi2Se3via optical pump mid-infrared probe spectroscopy. We observed largely enhanced carrier relaxation when the topological-phase transition takes place.
Efficiencies of 280nm AlGaN Deep UV-LEDs are extracted based on carrier rate equation. The results point out that hole density in p-type cladding layer is one of the important factor for efficiency droop phenomena.
We report on the development of e-beam pumped mid-UV (~ 280nm) sources fabricated from AlGaN MQWs grown by plasma-assisted (PA) MBE on AlN/c-Al2O3templates. The high output power above 100 mW has been demonstrated in a pulse-scanning regime. This achievement is attributed to the enhanced carrier confinement within the…
Within the nuclear power plant operational life management, components lifetime extension requires information on structural material degradation. Innovative testing methods of Small punch testing and Automated ball indentation test are based on the determination of material properties from sub-sized specimens. Presen…
3D Numerical modeling for carrier transport in the EBL and InGaN quantum well by considering the random alloy fluctuation have been done. The result shows that percolative transport should be the dominant transport mechanism in the light emitting diode and affects the efficiency droop.
A tunable plasmonic vortex lens (PVL) that can adjust the size of vortex by changing optical polarization is proposed. The tunable PVL provides a novel degree of freedom in managing surface plasmon polariton fields.