Rational Design of Ag/TiO2 Nanosystems by a Combined RF‐Sputtering/Sol‐Gel Approach

The present work is devoted to the preparation of Ag/TiO₂ nanosystems by an original synthetic strategy, based on the radio‐frequency (RF) sputtering of silver particles on titania‐based xerogels prepared by the sol–gel (SG) route. This approach takes advantage of the synergy between the microporous xerogel structure and the infiltration power characterizing RF‐sputtering, whose combination enables the obtainment of a tailored dispersion of Ag‐containing particles into the titania matrix. In addition, the system′s chemico‐physical features can be tuned further through proper ex situ thermal treatments in air at 400 and 600 °C. The synthesized composites are extensively characterized by the joint use of complementary techniques, that is, X‐ray photoelectron and X‐ray excited Auger electron spectroscopies (XPS, XE‐AES), secondary ion mass spectrometry (SIMS), glancing incidence X‐ray diffraction (GIXRD), field emission scanning electron microscopy (FE–SEM), transmission electron microscopy (TEM), electron diffraction (ED), high‐angle annular dark field scanning TEM (HAADF–STEM), energy‐filtered TEM (EF–TEM) and optical absorption spectroscopy. Finally, the photocatalytic performances of selected samples in the decomposition of the azo‐dye Plasmocorinth B are preliminarily investigated. The obtained results highlight the possibility of tailoring the system characteristics over a broad range, directly influencing their eventual functional properties.     

锂离子电池用SnZn/Cu薄膜负极材料的研究

合金型锂离子电池负极材料由于容量高、安全性好而备受关注. 采用磁控溅射法在铜箔上渡膜制备锡锌薄膜, 经热处理后得到合金薄膜电极. 薄膜热处理后, 表面活性层形成Cu3Sn中间合金. 合金薄膜是由尺寸在5 μm左右的合金颗粒构成, 而合金颗粒则由更小的尺寸在50 nm左右微粒组成, 该合金薄膜同时具有薄膜、中间合金和纳米结构材料的特征. 合金薄膜电极具有较高的充放电容量、良好的循环性能和非常高的充放电效率. 在0.01～1.0 V (vs. Li/Li＋)区间, 电极循环200周后放电容量保持在300 mAh•g－1以上, 与第一次脱锂容量相比较, 容量保持率高达91.9%, 充放电效率大于98.0%.     

YBCO涂层导体用YSZ缓冲层的快速制备研究

基于反应直流溅射法,采用镶嵌有钇粒的金属锆作为靶材,去离子水蒸汽为氧化反应气体,在有Y2O3种子层的双轴织构Ni -5at.％W基带上,系统地研究了温度和卷绕速度对YSZ阻挡层薄膜结构及表面形貌的影响.X射线衍射(XRD)分析表明,生长温度在700℃时制备的薄膜呈现明显的(002)取向;原子力显微镜(AFM)分析显示,该温度下制备的薄膜表面致密、无孔洞、无裂纹.在不同的卷绕速度下,虽然薄膜均为纯c轴取向,但其均方根粗糙度(RMS)和微粒大小均有较大差别.快速制备可达到抑制基片表面氧化、助于薄膜取向改善、提高薄膜制备效率的目的.     

溅射气压对DC磁控溅射制备AlN薄膜的影响

采用DC反应磁控溅射法,在Si(111)和玻璃基底上成功的制备了AlN薄膜。研究溅射过程中溅射气压对薄膜性能的影响。结果表明:薄膜中原子比N/Al接近于1;当溅射气压低于0.6 Pa时,薄膜为非晶态;当溅射气压不低于0.6 Pa时,薄膜的XRD图中均出现了6方相的AlN(100)、(110)和弱的(002)衍射     

Study on the layer structure of W/C multilayers deposited by magnetron sputtering using x‐ray reflectivity

A study on the layer structure of W/C multilayers deposited by magnetron sputtering is reported. In the study, soft x‐ray resonant reflectivity and hard x‐ray grazing incidence reflectivity of the W/C multilayers were measured. The imperfections at the interface such as interdiffusion and formation of compounds were dealt with by two methods. On analyzing the experimental results, we found that the incorporation of an interlayer was a more suitable method than the traditional statistical method to describe the layer structure of a W/C system we fabricated. The optical constants of each layer at a wavelength of 4.48 nm were also obtained from the analysis. Copyright © 2008 John Wiley & Sons, Ltd.     

Ag/AgBr复合体高能电子作用下的溅射现象

报道了Ag/AgBr复合体在透射电子显微镜(TEM)中观察到的一种有趣的溅射现象, 发现在高能电子的作用下, Ag/AgBr靶材飞溅出众多的纳米Ag粒子, 它们呈现很好的分散性, 其粒子的平均尺寸呈梯度变化, 初步探讨了此现象产生的机理.     

离子束增强沉积和磁控溅射硫化钼薄膜的摩擦磨损性能研究

在离子束增强沉积的Ｓｉ３Ｎ４膜和ＴｉＮ膜的表面，分别利用离子增强沉积法和磁控溅射法制取了ＭｏＳｘ薄膜。在ＳＲＶ摩擦磨损试验机上，对几种薄膜试样与５２１００钢板样作了对比试验研究。结果表明，两种ＭｏＳｘ薄膜都具有良好的摩擦磨损性能。     

低温衬底的射频反应溅射法制备a-SiO_2薄膜的研究

低温衬底使器件在制膜过程中避免热伤害． 研究得到强水冷衬底的射频反应溅射法制备ａ－ＳｉＯ２ 薄膜的最佳工艺条件． 所制得的薄膜具有好的致密度和抗腐蚀性．     

溅射制备非晶氮化镓薄膜的光学性能

采用直流磁控溅射方法在不同的氩气-氮气（Ar-N₂）气氛中制备了非晶氮化镓（a-GaN）薄膜. X射线衍射分析（XRD）和拉曼光谱（Raman）表明薄膜具有非晶结构. 通过椭偏光谱（SE）得到薄膜的折射率和厚度都随着氩气分量的增多而增大. 紫外—可见光谱（UV-Vis）的测量得到,当氩气分量R,即Ar/（Ar+N₂）,为0%时,薄膜的光学带隙为3.90eV,比晶体GaN （c-GaN） 的较大,这主要是由非晶结构中原子无序性造成的;而当R关键词： 非晶氮化镓 溅射 光学带隙 带尾态     

离子束溅射沉积Ti-Ni薄膜及其电化学性能的研究

利用离子束溅射沉积的方法在不同基片温度条件下制备了不同成分的Ti-Ni贮氢薄膜,研究了其电化学贮氢性能。结果表明：用离子束溅射沉积制备的Ti-Ni薄膜的结构为非晶状,薄膜对基片的附着力较强,在冲放电循环50次后仍为非晶态;在基片温度为350℃时制备的薄膜的结构为晶态,在多次放电循环后呈现非晶化趋势;Ti-Ni薄膜具有较高的电化学活性,晶化薄膜比晶态薄膜的最大放电容量高,但晶化薄膜的循环稳定性差。