Materials Literature
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Electric conductivity variations of hydrogenated amorphous silicon due to self-ion irradiation, i.e. irradiation with Si or H ions, are comprehensively investigated. The anomalous enhancement of dark conductivity (DC) and photoconductivity (PC) are firstly observed due to proton irradiation in the cases of undoped and…
Abstract In this study maltose, maltotriose and maltotetraose were for the first time, coupled to 4,4′-methylenedianiline (MDA). The aim of this preliminary work was to test the feasibility of oligo- and polysaccharide coupling to MDA and the characterization of the coupling products by high resolution mass spectromet…
최근에는 초탄성 형상기억합금을 구조물 일부에 설치하여 지진과 같은 외부 충격하중으로 인해 발생되는 영구적인 소성 변형을 줄이고 자동치유가 가능한 변위제어 시스템을 개발하는 연구가 활발하게 진행되고 있다. 초탄성 형상 기억합금은 상당량의 변위를 가하더라도 별도의 열처리 없이도 상온에서 단지 하중만을 제거하여도 원형으로 복원이 가능한 독특한 합성 금속재료이다. 뼈대 구조물에서 변형이 집중이 되는 부위에 기존에 사용된 강재를 대신하여 초탄성 형상기억합금을 사용한다면 시스템의 복원 효과를 극대화 시킬 수 있다. 따라서 본 연구는 내진성능이 우수한 좌굴방지 가새프레임에 초탄…
We analyse charge carrier propagation in graphene-based structures surrounded by conducting regions in which electrons obey the Schr?dinger equation. The influence of Schr?dinger?Dirac transformations on electron transmission has been investigated, and significant differences have been observed compared to the case wh…
SPEEK/PWA/silica 전해질 복합막을 제조하기 위하여 졸-겔 방법을 이용하였다. 졸-겔반응의 전구체로는 TEOS를 사용하였으며 첨가제 겸 촉매로는 phosphotungstic acid(PWA)를 사용하였다. FE-SEM 분석을 통하여 PWA 및 silica 나노입자들은 고분자속으로 균일하게 분산되는 것을 확인할 수 있었다. SPEEK/PWA/silica 복합막의 함수율은 TEOS의 비율이 낮은 경우에는 TEOS의 증가에 따라 함수율이 감소하였지만 TEOS의 비율이 높은 경우에는 TEOS의 영향을 적게 받았다. SPEEK/PWA/silica 복합막의 이온전도…
Two regions of selective light reflection (in the short- and long- wavelength parts of the visible spectrum) from a thin film of a cholesteric liquid crystal (CLC), consisting of the mixture of two CLCs with opposite chirality and a nematic liquid crystal, are experimentally found for the first time. The spectral posi…
Optical sensors based on Raman spectroscopy are suitable for a rapid identification and quantification of pollutants such as Polycyclic Aromatic Hydrocarbons (PAHs). Additionally, Surface enhanced Raman spectroscopy (SERS) has gained increasing attention as a powerful technique for in-situ monitoring of these substanc…
Surface study of thin film is characterized by employing scanning Electron microscopy (SEM). The implementation of image processing algorithm is to determine the pores in the SEM images of thin film. Image segmentation is applied to detect the pores in the thin film. In this paper, ZnO thin film is used for the surfac…
The quantum efficiency ofc-plane AlxGa1-xN and AlxInyGa1-x-yN structures (x= 0.06–0.21,y= 0.015–0.05) emitting in the UV spectral range between 320 and 350 nm was analyzed using temperature-dependent and polarization-resolved photoluminescence measurements. We found increasing bandgap fluctuation and charge carrier lo…
The effects of chemical treatments and Al2O3 deposition on the InAlN surface were investigated by X-ray photoelectron spectroscopy (XPS). Independent of the extent of native oxide removal, the In 4d core-level binding energy was the same for untreated, HCl-treated, and HF-treated InAlN. This indicated a strong pinning…
The model of relaxation of photoconductivity of porous silicon, in which recombination of photocarriers is taken into account on the spherical surface of pores at the shutdown of illumination, is presented and numerically investigated. By the finite element method it is calculated time evolution of the photoconductivi…
We demonstrate the application of nitrogen (N) implantation in GaN as a current-blocking layer. In a first step, vertical current-blocking behavior was confirmed by processing quasi-vertical Schottky diodes with full-area N-implantation. The leakage current was only 10−6 A cm−2 in forward and reverse directions. Also,…
The immobilization of heteropoly acids (HPAs) into the Al-functionalized KIT-6 mesoporous molecular sieve has been carried out to see the effect of Al-KIT-6 as a host matrix on the HPA activities. These modified mesoporous molecular sieves are effective catalysts for the Hosomi–Sakurai three-component coupling reactio…
QD Vision has developed Quantum Dot Light Emitting Devices whose emission spans the wavelength range from 1000 nm to 1.35 μm, using tunable, narrow band quantum dot emission. These devices emit sufficient power for long range-detection by a variety of systems, run at very low drive voltages, and are producible in area…
A cylindrical matrix device with a circular release area with inhomogeneous diffusivity was analyzed using a Laplace transform–based method, using Bromwich integral and residue theorem. The two-dimensional model represented a pharmaceutical agent uniformly distributed in a polymeric matrix with a diffusivity spatially…
Thermodynamic modeling of the Ni 0.5 Zn 0.4 Cu 0.1 Fe 2 O 4 complex ferrite system has been adopted as a rational approach to establish routes to better synthesis conditions for pure phase Ni 0.5 Zn 0.4 Cu 0.1 Fe 2 O 4 complex ferrite. Quantitative analysis of the different reaction equilibria involved in the precipit…
Abstract The first transition metal iodato peroxido complex, K3[V2O2(O2)4(IO3)]·H2O (I), was prepared by crystallization from the KVO3 — KIO3 — H2O2 — H2O — ethanol (HNO3) solution. The dinuclear anion is immediately decomposed in aqueous solution; the 51V NMR spectrum exhibits signals corresponding to [VO(O2)2(H2O)]−…
We report the results of the first experiments on the growth of indium nitride films by electron cyclotron resonance plasma-enhanced metal organic chemical vapor deposition. Discharge sustained by the radiation of a technological gyrotron with a frequency of 24 GHz and power up to 5 kW was used to provide active nitro…
Dendrimers are branched polymeric structures that have been shown to have a promising antiamyloidogenic potential by interfering with the polymerization process leading to the formation of the amyloid aggregates related to conformational diseases, such as Alzheimer's and prion diseases. It has been established that th…
Zr0.05Ti0.95O2 solid solution nanowires were synthesized directly on a SnO2:F-coated glass via a low-temperature hydrothermal method, and a high-sensitivity self-powered ultraviolet detector based on SnO2:F/Zr0.05Ti0.95O2 heterojunction was fabricated subsequently. Zr doping not only improves the detector's photorespo…