钛酸锶钡薄膜掺杂改性研究进展

钛酸锶钡(BaxSr1-xTiO3,BST)薄膜具有优良的铁电、介电性能,在可调谐微波器件、动态随机存储器、红外探测器阵列等方面具有良好的应用前景.综述了近年来BST薄膜掺杂改性研究所取得的进展,特别是对晶格掺杂和晶界掺杂进行了较详细的评述,并对目前BST薄膜掺杂研究的几个前沿问题进行了详细的讨论.     

Designed Patterning of Mesoporous Metal Films Based on Electrochemical Micelle Assembly Combined with Lithographical Techniques

Mesoporous noble metals and their patterning techniques for obtaining unique patterned structures are highly attractive for electrocatalysis, photocatalysis, and optoelectronics device applications owing to their expedient properties such as high level of exposed active locations, cascade electrocatalytic sites, and large surface area. However, patterning techniques for mesoporous substrates are still limited to metal oxide and silica films, although there is growing demand for developing techniques related to patterning mesoporous metals. In this study, the first demonstration of mesoporous metal films on patterned gold (Au) substrates, prefabricated using photolithographic techniques, is reported. First, different growth rates of mesoporous Au metal films on patterned Au substrates are demonstrated by varying deposition times and voltages. In addition, mesoporous Au films are also fabricated on various patterns of Au substrates including stripe and mesh lines. An alternative fabrication method using a photoresist insulating mask also yields growth of mesoporous Au within the patterning. Moreover, patterned mesoporous films of palladium (Pd) and palladium–copper alloy (PdCu) are demonstrated on the same types of substrates to show versatility of this method. Patterned mesoporous Au films (PMGFs) show higher electrochemically active surface area (ECSA) and higher sensitivity toward glucose oxidation than nonpatterned mesoporous Au films (NMGF).     

Structural aspects of Langmuir-Blodgett and cast films of zinc phthalocyanine and zinc hexadecafluorophthalocyanine

The processing of macrocyclic phthalocyanines (Pc) in the form of thin, nanostructured films has been usually carried out via evaporation techniques, owing to the low solubility exhibited by these compounds. The fabrication of Pc ultrathin films via the Langmuir-Blodgett technique may be advantageous from a technological point of view, since parameters such as film architecture and organization can be achieved without post-thermal treatments. In this study, a parent zinc phthalocyanine (ZnPc) and its fluorinated derivative (F₁₆ZnPc) were synthesized and manipulated in the form of LB films. The morphological and structural features of ZnPc and F₁₆ZnPc Langmuir-Blodgett films containing up to 31 layers were investigated using Fourier transform infrared spectroscopy (FTIR), micro-Raman spectroscopy and X-ray diffraction analyses and were compared to ZnPc and F₁₆ZnPc cast films. The interplanar distance obtained by X-ray specular reflection decreases from 12.64 Å for ZnPc to 12.16 Å for F₁₆ZnPc. FTIR spectra indicated absence of order in the LB films from ZnPc and F₁₆ZnPc, at least in the direction perpendicular to the substrate surface. Therefore, the order observed in the X-ray diffractograms means that the molecules might be organized in crystallites that are randomly oriented in the film.     

磁光盘的介质膜材料AlN,AlSiN薄膜的电子显微分析

本文研究了磁光盘介质薄膜－ＡｌＮ和ＡｌＳｉＮ薄膜的电子显微结构，通过透射电镜分析了ＡｌＮ薄膜的多晶结构和ｃ轴垂直取向；通过Ｘ射线衍射分析、透射电镜分析和Ｘ射线光电子能谱分析，确定了ＡｌＳｉＮ薄膜并不是多晶ＡｌＮ和ＳｉＮ薄膜的简单组合，而是形成了稳定的非晶特征结构。且ＡｌＳｉＮ薄膜由于其非晶结构而比ＡｌＮ薄膜的磁光克尔效应增强效果更优越。     

新型红外增透膜和保护膜EI

介绍了类金刚石碳（ＤＬＣ）膜和碳化锗（Ｇｅ＿ｘＣ＿（１－ｘ））簿膜的沉积方法、特性和在红外光学镀膜中的应用进展。     

SrTiO3（110）上水热法外延生长PbTiO3薄膜

利用低温水热合成工艺，在一定浓度皆Ｐｂ（ＮＯ）３，ＴｉＣｌｒ的混合强碱性水溶液中，和在（１２０℃，０．２５ＭＰａ）的水热反应条件下，首次成功地在ＳｒＴｅＯ３单昌衬底上生长出具有面积构的ＰｂＴｉＯ３外延薄膜。     

聚酰亚胺的Langmiur—Blodgett膜

本文介绍了制备聚酰亚胺ＬＢ膜的“前聚物法”以及通过引入不同结构基团或各种后处理以得到不同性能的聚酰亚胺ＬＢ膜和它们各种可能的应用。     

ZrO_2薄膜的相结构与相稳定性

采用纯 Zr、添 Y_2O_3的 ZrO_2和添 MgO 的 ZrO_2为靶材,以射频溅射方法生成 ZrO_2薄膜。研究了这三个系列薄膜的物相结构,以及退火和研磨对物相结构的影响。研究表明,ZrO_2薄膜为单斜相,Y-ZrO_2和 Mg-ZrO_2薄膜为单斜相和正方相,且以正方相为主。它们的退火规律也各不相同,这与稳定剂的加入与性质有关。同时研磨并未诱导正方相向单斜相的转变。     

Photoelectrochemical solar cells using electrodeposited GaAs and AlSb semiconductor films

Electrodeposited GaAs and AlSb thin film semiconductors were prepared under various deposition conditions. Reasonable stoichiometry could be attained as revealed by EDAX studies. The best stoichiometry was obtained are Ga_1·04As_0·96 and Al_1·12Sb_0·88. The band gap of the GaAs and AlSb films was ∼1·5 eV and 1·6 eV respectively. The electrochemical and photoelectrochemical studies on these films are reported with different redox-couples in aqueous and non-aqueous medium.     

Polymeric packaging film for food products

The object of this paper is to report the development and testing of a new packaging film that increases the storage term of food and agricultural products, expands the functional possibilities of film packaging and improves product quality. To achieve this, the polyolefin polymeric packaging film is produced with a structure varying across its thickness with a density gradient ranging from ½p to ¼p, where p is the density of the polyolefin. The packaging film is a system in which the communicating pores are filled with specific additives in a liquid phase.     

Nanocomposites alumina/Pt produced by PVD and thermal oxidation methods used in catalytic applications

The work was focused on the deposition of Al₂O₃+Pt composite in the form of a nanofilm adherent to the substrate with good surface development and catalytic properties on the surface of 0H20J5 foil. With this end in view, a special carousel fixture for fixing the corrugated and flat foil and then coating with Al and Pt from two magnetron sources, in order to obtain a nanofilm of Al+Pt composite, was designed. A Pt/Al laminate layer was also produced by depositing Pt first and then Al, and the other way round. The layer systems obtained this way were subject to oxidation for 48 h at 860 °C and under Ar+O₂. The surface examined has shown that the process of oxidation produces the compact sublayer of columnar crystals (whiskers) well adherent to the substrate from which the needle-like whiskers are growing. Structures of whiskers form a laminar system with a catalytic element having a very-well developed surface. Structure analyses revealed that the films obtained comprised mostly α and θ Al₂O₃ phases and missed a Pt crystalline phase. The film morphology on the basis of oxide-film sections examined by TEM showed that the α Al₂O₃ structure was generated mostly deep in oxide films and was integrated with the foil. A microanalysis showed that it was uniformly distributed in its entirety in the Pt-composite based layers; however, in the case of laminate the surface of whiskers was coated. It was found from the comparison of the laminar system activity that the composite layers revealed much better catalytic properties at lower temperature than the laminate layers.     

金属掺杂类金刚石膜的研究进展

金属掺杂类金刚石（Diamond—like Carbon,DLC）膜可以优化纯类金刚石膜的很多性能。金属掺杂DLC膜不仅在缓解薄膜应力方面具有良好的效果,而且还能改变薄膜的力学和摩擦磨损性能。目前,掺杂DLC膜正以单一掺杂向复合掺杂、均匀掺杂向梯度掺杂发展。文章对掺杂DLC膜的研究进展作了概括及分析。     

低温PVD法制备多组分超硬薄膜研究

对薄膜淀积的各种PVD技术和新型薄膜研究进展进行了综述 ,讨论了多组分硬质薄膜低温制备存在的问题 ,指出了解决的办法 ;归纳了影响多组分硬质薄膜在三维基体上均匀、均质淀积的因素 ,重点讨论了基体旋转与靶源配置问题 ;指出了用低温PVD法淀积多组分超硬薄膜研究方向。     

Growth and characterization of La1 − xAxMnO3 (A = Ag and K, x = 0.33) epitaxial and polycrystalline manganite thin films derived by sol-gel dip-coating technique

Manganite La_0.67Ag_0.33MnO₃ (LAgMO) and La_0.67K_0.33MnO₃ (LKMO) films have been obtained on a single-crystal of LaAlO₃ (100) and quartz substrates using sol-gel dip-coating technique. Structural, electrical, magnetic and magnetoresistance properties of the films have been investigated. X-ray diffraction patterns of the films grown on LaAlO₃ (100) substrate showed to be highly oriented in the direction of (100) and the films grown on the quartz substrate have perovskite with rhombohedral structure. The oriented films exhibited typical transport properties, whereas the polycrystalline films showed significantly different behaviors of the temperature dependent resistivity, magnetization and magnetoresistance (MR). The epitaxial films of the LAgMO and LKMO showed different metal-insulator transition temperature (T_MI) and the paramagnetic-ferromagnetic phase transition temperature (T_C). This was mainly due to the different ionic radius size of Ag¹⁺ and K¹⁺. The variation of T_MI and T_C was due to the different annealing temperatures and grain size effect in the polycrystalline films. The polycrystalline films showed a higher MR than the corresponding epitaxial films. An extrinsic MR has been observed at low temperatures (< 100 K) for the polycrystalline films due to the spin dependent scattering of conduction electrons at grain boundaries.     

Electrochromic and morphological investigation of dry-lithiated nanostructured tungsten trioxide thin films

Electrochromic properties of porous nanostructured thin films of tungsten trioxide were investigated. Films were fabricated at normal and high vapor incidence angles with the technique of glancing angle deposition in a thermal evaporation chamber. A dry lithiation method was subsequently used to intercalate films with lithium atoms. Coloration in both visible and near-infrared regions was observed with lithium insertion. We report on the morphology, porosity, and optical properties of as-deposited and lithiated films, and discuss the role of substrate tilt in comparing the coloration efficiency of these films.     

Magnetron sputtering of a vanadium-diboride target in Ar+N2 gaseous mixtures

The structure and composition of nanostructured multilayer V-B-N films, deposited by high-frequency magnetron sputtering of a composite VB₂ target in a gaseous mixture of argon and nitrogen, were studied by means of electron spectroscopy, X-ray diffraction and secondary ion mass-spectroscopy. The influence of the percentage ratio of nitrogen on the process of formation of films was investigated. On high-frequency reactive magnetron sputtering the composition of a superficial layer of a target changes. The influence of this change on structure and composition of coverings was described. The method of synthesis of multilayer films of borides and nitrides of vanadium is offered. Formation mechanisms of boride and nitride films are discussed.     

真空退火Co/Pt多层膜的结构、磁及磁光特性分析

本文用直流磁控溅射方法制备了Co／Pt多层膜,并对其进行了较为细致的真空退火处理,结果表明,适度的低温退火可增加Co／Pt多层膜的矫顽力,而并不削弱其磁滞克尔回线的矩形特征．当退火温度达到300℃以后,Co／Pt多层膜的矫顽力、垂直各向异性和克尔角将强烈下降,晶体结构的改善及应力的释放、晶粒的增长、层间原子扩散引起的Co层有效厚度减薄,进而居里温度的下降,分别是Co／Pt多层膜在低温、中温、高温退火过程中,磁及磁光性能变化的主要机制．