有机功能材料薄膜与器件

具有光、电、磁物理功能的有机材料的出现促进新思想、新概念、新材料的发展;有机功能材料的电子状态、导电机理以及杂质的影响完全有别于无机金属和半导体,因此,在深入探索结构与功能的关系的基础上,有可能开展分子、聚集态以及器件设计的研究。若与有机化合物的结构多样化,良好的加工性、成膜和成纤性等特点相结合,有可能实现无机电子材料所难兼具的电子行为。进而实现“分子电路”的设想。这里,我们对有机功能材料的基本概念、种类,功能材料薄膜的沉积、器件的构筑,分子电子学和分子器件的概念作了一个较为全面的介绍。     

多孔Cu2O／SnO2复合薄膜的制备及其可见光催化降解罗丹明B的性能

采用浸渍-沉积方法在电沉积的多孔Cu薄膜上修饰一层纳米SnO2,经低温热氧化处理制备出多孔Cu2O／SnO2复合多层薄膜。运用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X-射线粉末衍射仪（XRD）、紫外可见漫反射光谱（UV—vis DRS）和荧光光谱（FS）技术表征了薄膜的结构、形貌和光学性质。测试了薄膜在可见光下降解罗丹明B（RhB）的性能。结果表明,在30℃的0．2mol／LCuSO4＋1．5mol／L H2SO4镀液中,以1.5A／cm^2电流沉积20s得蓟的多孔Cu薄膜,在SnO2溶胶中浸渍10s并重复5次,再经空气气氛下100℃焙烧30min,锻得的多孔复夸薄膜显示良好的可见光催化降解RhB的性铯。     

Dielectric properties of BST/MZO ceramic composites

Ba0.6Sr0.4TiO3/Mg1-xZnxO(MZO,x=0,0.05,0.10,0.15 and 0.20) ceramic composites were prepared by traditional ceramic processing.The crystal structure,fracture surface morphology,and dielectric properties were investigated.The samples with x=0,0.05 and 0.10 exhibited favorable sintering behavior,and homogeneous diphase microstructure was obtained. Nevertheless,the microstructure of the samples with x=0.15 and 0.20 was inhomogeneous and abnormal grain growth could be observed,and the abnormal grain growth induced the degradation of dielectric strength.The sample with x=0.10 has relatively low dielectric loss(1.26×10-3) and the optimal FOM value(about 174) .     

Dielectric tunable properties of BaTi_4O_9-doped Ba_(0.6)Sr_(0.4)TiO_3 microwave composite ceramics

BaTi4O9-doped Ba0.6Sr0.4TiO3(BST) composite ceramics were prepared by the conventional solid-state reaction and their structure,dielectric nonlinear characteristics and microwave dielectric properties were investigated.The secondary phase of the orthorhombic structure Ba4Ti13O30 is formed among BST composite ceramics with the increase of BaTi4O9.At the same time,a duplex or bimodal grains size distribution shows fine grains in a coarse grain matrix.The degree of frequency dispersion of dielectric permittivity below Tm is increased initially and then decreased with respect to BaTi4O9.As the BaTi4O9 content increases,the tunability of composite ceramics decreases,while the Q value increases.Interestingly,70 wt%BaTi4O9-doped BST has a tunability～4.0%(under 30 kV/cm biasing) versus a permittivity～68 and quality factor ～134.1(at～3.2 GHz) .     

工作气压对磁控溅射法制备硼碳氮薄膜结晶度的影响

本文用六方氮化硼和石墨靶材采用射频（频率为13．56MHz）磁控溅射法沉积硼碳氮薄膜,得到的硼碳氮薄膜可用红外,拉曼表征。工作气压从0．2Pa升高到6．0Pa。我们可以观察到工作气压可以明显的改变硼碳氮薄膜的晶体结构和结晶度。硼碳氯薄膜的半高宽随工作气压的增加而变化并且在工作气压1．0Pa时得到较好结晶度的薄膜。     

Convergence and the Constant Dynamic Linear Model

It is well known that, as calculated using the Kalman filter recurrence relationships, the posterior parameter variance and the adaptive vector of observable constant dynamic linear models converge to limiting values. However, most proofs are tortuous, some have subtle errors and some relate only to specific cases. An elegant probabilistic convergence proof demonstrates that the limit is independent of the initial parametric prior. The result is extended to a class of multivariate dynamic linear models. Finally the proof is shown to apply to many non-observable constant DLMs. © 1997 John Wiley & Sons, Ltd.     

三维有序大孔材料的合成及应用

胶晶模板法是制备三维有序大孔(3DOM)材料较理想的方法,制备过程一般包括组装胶晶模板、往模板间隙内填充前驱物和去掉模板及前驱物转化等3个步骤。每一步都对产物的三维有序大孔结构有很大的影响。这种材料兼具固体材料本身和有序结构两种特性,在用作光子晶体、载体、电极材料、气敏元件和分离材料等方面具有潜在应用性。本文着重介绍了大孔材料的合成及应用。     

SOFC封接材料和封接技术

本文综述了国内外固体氧化物燃料电池(SOFC)用封接材料和封接技术的发展现状及趋势。指出各种封接方式的优缺点及其在不同国家、地区的发展情况。并根据SOFC的要求、技术特点以及我国的资源优势,提出合理有效的封接材料及封接方式,以促进SOFC在我国的发展。     

聚合物超薄膜结晶相关的形貌形成及链行为

聚合物超薄膜结晶是高分子物理领域的一个新研究课题,近来已引起人们的关注,其为人们在真实时空下研究聚合物结晶及相关链行为提供了可能。聚合物超薄膜结晶与膜厚(D)有很强的相关性,尤其是D<20nm的薄膜在结晶形貌和结晶动力学方面与本体结晶差别很大。已有的结果主要集中在结晶形貌、晶体尺寸、晶体生长速度和习性、晶体的熔融和结晶度等方面,涉及温度、膜厚、基片性质和膜的组成和结构对结晶的影响;然而,有些实验结果和解释彼此不完全一致,甚至有时相互矛盾。本文综述和讨论了近年来在超薄膜结晶方面的研究,重点在于结晶形貌的形成和相关的聚合物链行为。