Influence of the substrate material on the properties of pulsed laser deposited thin Li1+xMn2O4−δ films

Thin Li_1+xMn₂O_4−δ films were deposited on several substrate materials (stainless steel, p-doped silicon and glassy carbon) by pulsed laser deposition. To obtain the correct thin film stoichiometries, targets with a different amount of excess lithium were required (Li_1.03Mn₂O₄ + xLi₂O; x = 2.5 and 7.5 mol%). The resulting polycrystalline thin films were characterized with respect to their morphology and electrochemical activity. It was found that only thin Li_1+xMn₂O_4−δ films deposited on stainless steel and glassy carbon showed the typical insertion and deinsertion peaks of Li⁺ during cycling.     

Characteristic and microstructure of the microarc oxidized TiO2-based film containing P before and after chemical- and heat treatment

Chemical- and heat treatment was performed to modify the surface of the microarc oxidized TiO₂-based (TOB) film containing P to produce nano-scale compounds containing Na, Ti and O elements. In the TOB film, anatase and rutile nanocrystals were randomly distributed in P-doped matrix. On the surface of the chemically treated TOB (C-TOB) film, amorphous titanium oxide containing Na shows nano-scale ribbonlike morphology. Na, Ti and O show uniform distribution in the outer layer of the C-TOB film along surface depth. Chemical treatment did not alter the surface roughness of the TOB film obviously; however, it improved its hydrophilic property. Heat treatment has no influence on the chemical states of Ti, Na and O, as well as wetting ability, elemental composition and atomic concentration in the outer layer of the C-TOB film. However, the phase compositions and surface morphology of the C-TOB film after heat treatment are dependent on the heat treatment temperature.     

利用电子束蒸发制备铝隧道结工艺研究

采用电子束蒸发的方法在Si片上制备超导铝(Al)薄膜。利用X射线衍射和直流四电极电阻法分别测试了厚度从100埃到5000埃的Al薄膜物向组成,超导转变温度(Tc)和临界电流密度(Jc)。当Al薄膜厚度大于500埃时,超导转变温度Tc=1.2K。电子束蒸发制备的Al薄膜性能良好,具有较高的结晶质量,为制备Al超导隧道结奠定了良好基础。对小面积的Al超导隧道结工艺进行了研究,该超导隧道结两层的超导体材料为Al薄膜,中间势垒层材料为Al2O3。其中Al薄膜利用电子束蒸发制备,势垒层通过直接氧化Al薄膜表面实现,该工艺和采用直接蒸发氧化物薄膜工艺相比不仅简单而且能有效防止势垒层不连续造成的弱连接。     

Green-emissive transparent BaSi2O5:Eu film phosphor on quartz glass created by a sputtering thermal diffusion process

Eu²⁺-doped BaSi₂O₅ film phosphors on quartz substrates are fabricated by radio-frequency magnetron sputtering thermal diffusion. The BaSi₂O₅: Eu²⁺ phosphor crystals have some preferred orientations that are lattice-spacing matched with the crystallized β- SiO₂ crystals, and they show pore and grain boundary-free morphology with a rod-like shape fused into the crystallized β- SiO₂ crystals. The BaSi₂O₅: Eu²⁺ film phosphor has a high transparency, with a transmittance of about 30% in visible light. The BaSi₂O₅: Eu²⁺ film phosphor shows 510 nm green emission from the f–d transition of the Eu²⁺ ions, and in particular the best sample shows a green photoluminescence brightness of about 5% of a BaSi₂O₅: Eu²⁺ powder phosphor screen. These excellences in optical properties can be explained by less optical scattering at pores or grain boundaries, and less reflection at the continuously index-changed interface.     

Growth of thin polymer films containing side-chain azo-dye analyzed by atomic force microscopy

Thin films containing both the azo-dye disperse red 1 (DR1) and the poly(methylmetacrylate) (PMMA) or the poly(phenylenevinylene) (PPV) are deposited by Langmuir-Blodgett and spin coating techniques on various substrates. The morphology, surface structure and growth pattern of the azo-dye-polymers were studied by atomic force microscopy. Nucleation and growth processes are responsible for the generation of different structures. The spin coated films were additionally oriented using the electric field poling method (corona poling). The film homogeneity is improved by this method in all cases. Due to the polar character of DR1 molecules, rod-like sub-structures are observed after the corona poling process in DR1-MMA films. The indium tin oxide surface enhances reorientation of the azo-dye-polymer molecules during corona poling and results in a significant reduction of the surface roughness.     

三半波带通滤光片的制作与膜厚分析

在光学薄膜镀制中, 比较片与样品片之间的厚度比例关系是间接监控法成功的重要参数. 计算表明, 三半波带通滤光片中心位置能大致推测出这一关系, 通带形状能粗略反映镀制过程中的变化以及不同膜料间的比例系数差别. 后期, 作者顺利制作出多个不同中心位置的带通滤光片.     

ATR-FTIR光谱法快速测定BOPP薄膜的厚度和定量

应用傅里叶变换衰减全反射红外光谱(ATR-FTIR)分析技术,结合偏最小二乘法(PLS)建立了预测BOPP薄膜厚度和定量等物理指标的校正模型。将模型的预测结果与标准方法测定结果比较,在显著性水平为5%的条件下,两种方法不存在显著性差异。该方法用于BOPP薄膜厚度和定量等物理指标的测定,操作简捷、准确,结果令人满意。     

BOPET薄膜生产过程中模头流出物的红外光谱分析

本文通过模头流出物和正常 BOPET薄膜的红外光谱分析。确认模头流出物含有不同于正常聚酯(PET)的结构 ,在分子结构中存在 CH2 O CH2 、 C6H4(CO) CH2 、 (CH2 ) n 〔n>4〕、C6H4O CH2 、 C6H4CH2 和 CH 等新的结构     

EFFECTS OF BLENDING CHITOSAN WITH PEG ON SURFACE MORPHOLOGY,CRYSTALLIZATION AND THERMAL PROPERTIES

Biodegradable blend films composed of chitosan and PEG with various composition ratios were prepared.The chemical structure of the blend films was characterized with FTIR and X-ray,which showed no chemical bond formations but certain interactions probably coming from the hydrogen bonds.Morphologies of these blend films were viewed using AFM and SEM,suggesting that pure chitosan film had a smooth surface structure and the blend films surface showed a plenty of holes with varying size.Through the DMA measu...     

Preparation and characterization of cellulose nanocomposite films with two different organo-micas

The mechanical properties, morphologies, and gas barriers of hybrid films of cellulose with two different organoclays are compared. Dodecyltriphenyl-phosphonium-mica (C₁₂PPh-mica) and hexadecyl-mica (C₁₆-mica) were used as reinforcing fillers in the fabrication of the cellulose hybrid films. The cellulose hybrid films were synthesized from N-methyl-morpholine-N-oxide (NMMO) solutions with the two organo-micas, and solvent-cast at room temperature under vacuum, yielding 15–20 μm thick films of cellulose hybrids with various clay contents. We found that the addition of only a small amount of organoclay is sufficient to improve the mechanical properties and gas barriers of the cellulose hybrid films. Even polymers with low organoclay contents (1–7 wt %) were found to exhibit much higher strength and modulus values than pure cellulose. The addition of C₁₂PPh-mica was more effective than that of C₁₆-mica with regards to the initial tensile modulus, whereas the addition of C₁₆-mica was more effective than that of C₁₂PPh-mica with regards to the gas barrier of the cellulose matrix. The intercalations of the polymer chains in the clays were examined with wide-angle X-ray diffraction (XRD) and electron microscopy (SEM and TEM).