Materials Literature
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In this study, we develop graphitic carbon-water nonbonded interaction parameters entirely from ab initio calculation data of interaction energies between graphene and a single water molecule. First, we employ the Møller-Plesset perturbation theory of the second order (MP2) method to compute the polycyclic aromatic hy…
The interstitial loop is a unique signature of radiation damage in structural materials for nuclear and other advanced energy systems. Unlike other bcc metals, two types of interstitial loops, 1/2<111> and <100>, are formed in bcc iron and its alloys. However, the mechanism by which <100> interstitial dislocation loop…
We propose an hybrid graphene/metamaterial device based on terahertz electronic split-ring resonators directly evaporated on top of a large-area single-layer CVD graphene. Room temperature time-domain spectroscopy measurements in the frequency range from 250 GHz to 2.75 THz show that the presence of the graphene stron…
Plasmonic dark modes are pure near-field modes that can arise from the plasmon hybridization in a set of interacting nanoparticles. When compared to bright modes, dark modes have longer lifetimes due to their lack of a net dipole moment, making them attractive for a number of applications. We demonstrate the excitatio…
We investigate charge, valley, and spin transports in a normal/ferromagnetic/normal silicene junction. We show that the charge, valley, and spin conductances in this junction oscillate with the length of the ferromagnetic silicene. It is also found that the current through this junction is valley and spin polarized du…
In this Letter, we map for the first time the current distribution among the individual layers of multilayer two-dimensional systems. Our findings suggest that in a multilayer MoS2 field-effect transistor the "HOT-SPOT" of the current flow migrates dynamically between the layers as a function of the applied back gate…
Quantum conductance calculations on the mechanically deformed monolayers of MoS${}_{2}$ and WS${}_{2}$ were performed using the nonequlibrium Green's functions method combined with the Landauer-B\"uttiker approach for ballistic transport together with the density-functional-based tight binding method. Tensile strain c…
라만 분광기는 그래핀의 특성을 분석하기 위한 필수적인 방법이다. 상용 마이크로 라만 분광기는 작은 면적에 대해 유용하게 사용되고 있으나 작은 면적 측정으로 인하여 산업적으로는 시료 측정 등에 제한적으로 사용되고 있다. 본 논문에서는 그래핀의 대면적 이미지 얻을 수 있는 라만 분광기에 대해 제안하였다. 이 이미지를 이용하여 그래핀의 유무 및 결함에 대한 정보를 빠르게 얻었다. 이를 이용하여, 실시간으로 그래핀에 대한 결함 유무, 층 수에 대한 균일도를 확인할 수 있으며, 양산 그래핀에 대한 품질 평가에 활용할 수 있을 것이다. A Raman spectrometer i…
(As₂S₃)₁₀₀₋x(SbSI)x (x = 80 and 90) glasses were prepared by cooling \nhomogenized melts from 720…750 K in cold water. Their structure and structural \nchanges under heat treatment of glasses are confirmed by studies of micro-Raman \nscattering and X-ray diffraction. In the matrix of these glasses, we obse…
The use of porous polymer materials for vascular prostheses demonstrates promising results. Fleece‐like nonwoven structures can be generated by atomization of dissolved polycarbonate urethanes. This article focuses on the manufacturing process for the fleece structures. The solution is atomized through a high volume l…
Revised in this work is the correlation equation Q₁ = 2.3×π/D in the FSDPrelated \n void-based model for As₂S(Se)₃ chalcogenide glasses between the first sharp \n diffraction peak (FSDP) position, Q₁, and nanovoid diameter, D, are modified to be \n presented in the form of Q₁ = 1.75×π/D, taking into accoun…
We investigated sandwich structure of the conventional absorber metamaterials to expand the study on dual-band absorption in our previous work (2013 Appl. Phys. Lett. 102 081122). The advantages of the artificial structuring of plasmonic resonators or 'meta-atoms' were exploited to gradually enhance/degrade the absorp…
Abstract Microchannel reactors and heat exchangers have been developed by application of a novel laser welding technique, which generates durable sealing of the reactors for operating temperatures up to 1000 °C. A microreactor for exhaust gas cleaning purposes has been operated for 35 000 h in a laboratory environment…
We found that ZnO:Eu films sputter-deposited with H 2 O vapor gas produce intense photoluminescence from Eu 3+ ions through excitation of ZnO host crystals with a 325-nm laser light, whereas those deposited with O 2 gas do not. At optimum annealing temperatures of 300–500 °C, the primary luminescence from Eu 3+ ions a…
A fluorescent turn-on detection for ascorbic acid has been developed based on hyperbranched conjugated polyelectrolyte. The fluorescence probe benefits from the high signal amplification from hyperbranched molecular structure of the conjugated polymer and produce fluorescence superquenching by Cu2+ ions with a detecti…
For liquid crystal dispersions of carbon nanotubes (CNT), experimental data on time stability of their characteristics were obtained by three different methods (optical transmission vs. temperature, electric conductivity vs. time, and electric conductivity vs. voltage in conditions of Freedericksz transition). The res…
The liquid crystalline behavior of an azomethine, namely 4-chlorobenzylidene-4-n-butoxyaniline (M), was investigated by using optical polarized light microscopy, differential scanning calorimetry, thermo-optical analysis and powder X-ray diffraction at temperature. Fourier transform infrared spectroscopy (FTIR), in at…
We describe herein the synthesis of (rac)- or enantiopure (S)-(-)-(2-MeBu)N(Pr)₂MeI ammonium salts. These racemic and enantiopure ammonium salts were used as cationic templates to obtain new two-dimensional (2D) ferromagnets [(rac)-(2-MeBu)N(Pr)₂Me][MnCr(C₂O₄)₃] and [(S)-(-)-(2-MeBu)N(Pr)₂Me][ΔMnΛ nCr(C₂O₄)₃]. The abs…
Impedance and electrical conduction studies of <TEX>$Ba(Nd_{1/2}Nb_{1/2})O_3$</TEX> ceramic prepared using conventional high temperature solid-state reaction technique are presented. The crystal symmetry, space group and unit cell dimensions were estimated using Rietveld analysis. X-ray diffraction analysis indicated…
We present a new method to measure without any calibration the thermal effusivity, conductivity, and diffusivity of an insulating layer deposited on a substrate, using lateral heat diffusion. The method is applied to Lithium phosphorous oxynitride, a thin film solid-state electrolyte used in micro-batteries.