Materials Literature
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采用热注入法, 在油胺(OLA)中合成出Cu 2 ZnSnS 4 (CZTS)纳米颗粒, 并在玻璃衬底上制备了薄膜, 研究了不同合成温度对纳米颗粒生成的影响. 通过X射线衍射仪、拉曼光谱仪、透射电子显微镜、扫描电子显微镜、紫外-可见分光光度计对所得纳米晶材料的结构与成分、颗粒大小与形貌、光吸收谱进行了测试分析. 研究结果表明: 采用热注入法的最佳合成温度在260℃左右, 该温度下生成的多晶CZTS纳米颗粒尺寸约10 nm, 分散性良好, 光学禁带宽度约1.5 eV.
A new kind of electrochromic device composed of a CeO2 modified TiO2 nanotube array counter electrode and a working electrode of P3MeT film was reported. The counter electrode was fabricated by electrodepositing CeO2 nanoparticles onto the walls of anodized TiO2 nanotubes. The CeO2 modified TiO2 nanotube array counter…
Fuel cell degradation and defects are factors that prohibit the commercialization of fuel cells. To understand how fuel cells may degrade, they are tested with and without defects to simulate real world applications. By analyzing degradation patterns of a fuel cell stack, operating conditions and geometry within a sta…
Download a PDF of "Guidelines for Project Selection and Materials Sampling, Conditioning, and Testing in WMA Research Studies" by the National Academies of Sciences, Engineering, and Medicine for free.
Abstract Impressive enhancements of the storage modulus have been documented when low volume fractions of single wall carbon nanotubes (SWNTs) are added to a Newtonian solvent for obtaining dilute suspensions. The intrinsic bending dynamics of carbon nanotubes (CNTs) has been proposed to explain such elasticity. CNTs…
The quantitative effects of polyethylene glycol (PEG) 6000 and tripotassium phosphate on protopectinase partition in the aqueous two-phase systems were investigated using response surface methodology. With an increase in PEG 6000 less than about 3.6 g protopectinase partition increased and decreased later beyond about…
This study focuses on the optimal washing conditions for dry cleaning recommended fabrics to minimize dimensional changes using wet cleaning. We suggest water-based alternatives to a perchloroethylene based cleaning process. Wool and rayon fabrics were laundered under various washing conditions and then air-dried for…
57Fe Mössbauer spectroscopy was used to study single-crystals of K0.8Fe1.76Se2.00 from 6 K to 673 K. At 6 K, the hyperfine field (Bhf) is canted away from the c-axis by 18 ± 3°. The temperature dependence of Bhf follows a spin wave model with a spin excitation gap of 9 ± 1 meV. A sudden increase in the linewidth and a…
Multi-walled carbon nanotube (MWCNT) aluminum composite powders were deposited to form coatings using a high velocity oxygen fuel (HVOF) spraying process. High thermal energy and contact with atmospheric oxygen were supplied as the MWCNT aluminum composite particles were exposed to a gas flow field at high temperature…
Tetragonal magnetostriction (λγ,2) and elastic constants (c′, c44, and c11) for Fe100−xSix were measured as a function of temperature (T). Compositions corresponding to the disordered A2 (x = 5), ordered D03 (x = 19.8), and mixed (x = 11.6) phases, were investigated. The magnetoelastic coupling (−b1) was determined fo…
AlGaN는 3.4~6.2 eV까지 넓은 밴드갭을 가지는 직접천이형 반도체이다. 최근에 자외영역의 광소자가 다양하게 응용되면서 자외선 발광이 가능한 AlGaN 역시 주목받고 있다. 이를 위해서는 고품질의 AlGaN 층이 필요하지만 GaN 층위에 AlGaN 층을 성장하는 것은 이들의 격자상수와 열팽창계수 차이로 인해 어렵다. 본 논문에서, multi-sliding boat법이 적용된 혼합소스 HVPE법을 이용하여 GaN template 위에 LED 구조를 성장하였다. 활성층의 Al 조성을 조절함으로써 AlGaN의 격자상수 변화와 광학적 변화를 관찰하고자 하였다. 에피…
The crystallization behavior of amorphous Sm5Fe17 melt-spun ribbon was studied. The crystallized phases in annealed specimens were deeply dependent on both the annealing temperature and the heating rate. The optimally annealed Sm5Fe17 melt-spun ribbon consisted of Sm5Fe17 grains of around 50–100 nm in diameter and exh…
Dissimilar friction welds were produced using 15-mm diameter solid bars of chrome molybdenum steel (KS SCM440) and carbon steel (KS SM20C) to investigate their mechanical properties. The main friction welding parameters were selected to ensure good quality welds on the basis of visual examination, tensile tests, Vicke…
When a transverse magnetic-polarized beam illuminates normally on an Ag grating mask with sub-wavelength slits, the surface plasmon (SP) interference patterns are formed on the Ag surface. According to the dispersion relationship of SPs, the wavelength of SPs (λsp) is tunable by altering the refractive index of the ph…
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IntroductionOrganic materials exhibiting strong nonlinear optical (NLO) properties have attracted considerable interest in recent years because of their promising applications in opto-electronic and all-optical devices such as optical limiters, optical switches and optical modulators (Munn & Ironside, 1993;Zyss, 1994)…
Integration of electronic
Low temperature fuel cells are a promising clean energy source, which can directly convert the chemical energy stored in hydrogen and small organic molecules (e.g., methanol, ethanol, and formic acid) into electrical energy with high efficiency, and thus find extensive applications in, for instance, automobiles and po…
采用两步溶剂热法在氧化氟锡(FTO)导电玻璃基底上制备了CuInS 2 敏化TiO2纳米棒阵列复合薄膜光阳极.利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征了复合阵列薄膜的晶体结构和表面形貌, 同时采用紫外-可见吸收分光光度计(UV-Vis)及光电流?电压(I-V)曲线研究了CuInS 2 敏化TiO 2 纳米阵列薄膜的光学及光电化学性质. 研究结果表明, TiO 2 纳米棒阵列薄膜被CuInS 2 敏化后在可见光区的吸收有明显的增强. 在模拟太阳光照射下 (100 mW/cm 2 ), 利用这种复合薄膜作为光阳极组装的量子点敏化太阳能电池的开路电压为0.29 V, 短路电流密度为0.15 mA/cm 2 , 具有一定的…
Among emission reduction technologies, a hydrocarbon lean nitrogen oxide trap is a cost-effective solution for nitrogen oxide emission control in light-duty vehicles. However, the hydrocarbon lean nitrogen oxide trap leads to high fuel consumption because diesel fuel is normally used as a reducing agent (i.e. a reduct…