Materials Literature
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Dual-mode multi-section distributed-feedback lasers with surface gratings have been fabricated using UV nanoimprint lithography. Frequency differences from 14GHz to 1.3THz for different longitudinal structures and frequency difference modulation speed up to 500MHz have been measured.
This paper reports the analysis of the composition, structure and phase of the re-deposition material that was generated from the reaction from CF4 plasma etching on the Al2O3-TiC substrate. The re-deposition was sputtered from the etching area and deposited on a silicon coupon for analysis. The morphology of the re-d…
금속 배선형성 재료가 구리로 대체됨에 따라 다마신(damascene) 공정이 도입되었고, 과증착된 구리를 화학적 기계적 평탄화(Chemical Mechanical Polishing, CMP) 방식을 통해 제거하는 구리 화학적 기계적 평탄화 공정이 필요하게 되었다. 본 연구에서는 중성영역 구리 화학적 기계적 평탄화 공정용 슬러리의 구성 요소 중 하나인 부식 방지제에 아미노기( $-NH_2$ )와 카르복실기(-COOH)를 부착시켜 그에 따른 영향성을 확인하고자 하였다. 1H-1,2,4-트리아졸(1H-1,2,4-triazole)을 기준 부식방지제로 선정하여 식각속도, 제…
Shape memory polymers (SMPs) are polymer materials that can fix the temporary shape and then recover to their original permanent shape by external stimulation, i.e. applied heat. In this research, shape memory polymer composites (SMPCs) from benzoxazine (BA-a)-epoxy binary systems reinforced with adamantine silicon ca…
Energy hardness is defined as energy density of material plastic displacement from the initial surface level. It is convenient to determine it from the kinetic indentation diagram constructed in the coordinates , where is a relative load, is a relative penetration of a spherical indenter. It dhould be note that a rela…
We report non-polarizing subtractive structural color filters based on surface plasmon-induced suppressed transmission via two-dimensional array of aluminum nano-patches over a glass substrate. Three subtractive primary colors i.e. cyan, magenta and yellow are demonstrated with high transmission efficiencies reaching…
This paper presents an innovative mechanical actuator using a shape memory alloy (SMA) with a cooling system based on combined thermoelectric effect and forced air cooling systems. The main advantages of using SMAs include the reduction of the system weight, the ease and reliability in application, and a simple contro…
We briefly summarize our recent efforts in employing meta-surfaces to control electromagnetic waves, including realizing high-efficiency photonic spin-hall effect and surface-plasmon couplers, and controlling phases with graphene-based meta-surfaces.
In this talk, I will discuss our recent efforts to develop purely dielectric metamaterials possessing low absorption loss at optical frequencies. I will discuss implementations ranging from wavefront control to high Q-factor resonances.
Thermomechanical conditions in which the elements of modern aircraft engines work, require the use of protective coatings. The coatings increase the creep strength and also the local thermal stress in the near-surface areas due to the differing thermal expansion of particular material layers. For this reason it is nec…
A wide application of magnesium aluminate spinel powder has attracted a number of studies concerning the preparation of magnesium aluminate spinel powder. In this study, a precursor for magnesium aluminate spinel was synthesized by a homogeneous precipitation method using urea as a precipitant. The precursor and the c…
We report on the fabrication of large-area aluminum plasmonic perfect absorber (Al-PA) using colloidal lithography combined with reactive ion etching process. Using the Al-PA, we demonstrate selective thermal emitters and tailor-made molecular vibrational sensing.
The bulk nanocrystalline (NC) aluminum (Al) 5083 was synthesized by spark plasma sintering (SPS) technique with low initial pressure of 1 MPa, high holding pressure of 300 MPa and holding time of 4 min at different sintering temperatures, using surface passivated nanopowders. The effect of sintering temperature on mic…
The concept of complex damage variables is introduced in this work. These damage variables have both real and imaginary parts. They are introduced not to use them in practical applications but to try to derive a direct relationship between the damage due to cross-sectional area reduction and the damage due to elastic…
THz generation efficiency from GaSe crystals were deteriorated by thermal equilibrium point defects and deviation from stoichiometry. Low temperature solution grown GaSe crystals were evaluated in comparison with commercially available Bridgman-grown crystals.
Coherent phonon dynamics of single-layer graphene (SLG) and multi-layer graphene (MLG) on sapphire substrate were investigated using femtosecond pump-probe techniques. The center peak of G-mode phonon redshift with the number of graphene layer and the temperature increases in the temperature range between 300 K and 90…
In this study, polyaniline (PAni), was used to surround Zinc Oxide (ZnO) nanoparticles to be dispersed in a High Density Polyethylene (HDPE) matrix. The dielectric properties of the composite samples were characterized using dielectric spectroscopy in a wide range of frequencies (10-2Hz - 1 MHz) at room temperature. I…
Me4P[Pd(dmit)2]2 is an organic magnet that show long range antiferromagnetic ordering as indicated by Muon Spin Rotation measurements. Three muon centers were observed in the material. To determine the muon stopping sites, we have employed the Molecular Orbital Cluster Method to study the electronic structure of muona…
In this study, the effects of different solvents such as ethanol, ethylene glycol, glycerol on the preparation of BiVO4 via solvothermal process, and the influent of calcination heat treatment were studied. The crystal structure, surface area, morphology and optical properties of the obtained BiVO4 particles were inve…
In a hydrogen production reactor, combustion of LPG was used as a heat source for ethanol steam reforming. For such purpose, the operating temperature was required to be around 700-900°C along the entire height of the reactor. Various types of porous media materials were used as a heat transfer media, i.e. 25mm cerami…