离子层气相反应法(ILGAR)制备CuInS_2薄膜的研究

0引言Ⅰ-Ⅲ-Ⅵ2族半导体薄膜太阳能电池具有价格低廉、性能优良和工艺简单等优点,已成为最有希望的光电转换器件,是当前国际光伏电池研究领域的热点之一。在Ⅰ-Ⅲ-Ⅵ2族半导体中,CuInS2因其光学禁带宽度适中(1.50eV),可见光区域吸收系数较高(6×105cm-1),化学稳定性好等特点而成为人们最为关注的薄膜太阳能电池材料之一[1~5]。目前,CuInS2薄膜太阳能电池的最高转换效率约为11%[6,7],距理论转换效率(27%~32%)[8]还有很大的差距,而改善CuInS2薄膜质量是提高其光电转换效率的关键。研究表明,CuInS2薄膜的制备技术及工艺条件对薄膜的结构…     

Effect of CuO–Bi<Subscript>2</Subscript>O<Subscript>3</Subscript> on low temperature sintered MnZn-ferrite by sol–gel auto-combustion method

A sol–gel auto-combustion method was investigated to incorporate small amounts of additives of Cu and Bi uniformly into soft magnetic MnZn-ferrite nanoparticles, which were prepared by Fe(NO₃)₃·9H₂O, Mn(NO₃)₂ and Zn(NO₃)₂·6H₂O dissolved in water and citric acid. The powder was characterized by the X-ray diffraction analysis and transmission electron microscope method. The effects of nano-particle sized powders in microstructure development and adding CuO–Bi₂O₃ into MnZn-ferrite on phase formation, densification process as well as magnetic properties were studied by scanning electron microscope and vibrating sample magnetometer techniques. The sample without additive can be sintered well at 930 °C, while the samples with a small amount of the additive can be sintered at less than 900 °C. Obviously, the micron-sized powders exhibited high sintering activity. It was also found that CuO–Bi₂O₃ additive promoted the growth of grains and improved magnetic properties. The permeability and the saturation magnetization were improved substantially by adding CuO–Bi₂O₃ into MnZn-ferrite and the sintering temperature was lowered to 875 °C, which may be associated with the redistribution of cations on the tetrahedral (A) sites and octahedral (B) sites within the spinel lattice.     

苯-丙-硅共聚物固相微萃取涂层制备及性能研究

合成了苯乙烯-丙烯酸丁酯-乙烯基三乙氧基硅氧烷三元共聚物,并对其结构进行了表征,对其热稳定性、粘度、与纤维的结合能力等物理性能进行了测试。使用自制固相微萃取装置,研究了该聚合物作为固相微萃取涂层的应用性能,对水中小分子烷基苯、氯苯、硝基苯进行了萃取实验,将萃取结果与商品涂层萃取结果进行了比较,令人满意。实验数据表明,苯-丙-硅三元共聚物作为固相微萃取涂层性能优良。     

超临界流体色谱在生物工程中应用的新进展

超临界流体色谱（SFC）是高效液相色谱（HPLC）和气相色谱（GC）的重要补充技术。用SFC可以分离多数不能用GC分离的低挥发性物质。与传统的HPLC相比，SFC的分离速度更快、效率更高。本文综述了SFC在生物分子分离分析方面应用的新进展。引用文献74篇。     

Anaphthalimide-based fluorescent probe for mercaptocontaining compounds

A polarity-sensitive fluorescent probe MNP was rationally designed and synthesized with naphthalimide as the fluorophore and maleimide as the receptor for thiols. MNP is weakly fluorescent due to the photoinduced electron-transfer(PET) from the fluorophore to the receptor, and it displays evidently solvatochromic UV–vis and fluorescence spectra: the emission shifted from 495 nm in n-hexane to545 nm in phosphate buffer solution. Michael addition reaction between thiols and the maleimide in MNP inhibited the PET process, which led to about eight-fold fluorescence enhancement. In addition,MNP showed highly sensitivity to mercapto-containing proteins and it could detect as low as 20.4 mg/m L of BSA in PBS. MNP has potential in fluorescent imaging of thiols in living cells.     

双苯基杂化整体柱的制备及毛细管电色谱性能研究

以苯基三乙氧基硅烷(PTES)和1,4-双三乙氧基硅基苯(BTEB)为反应单体,分别采用盐酸和十二胺为催化剂,通过两步酸碱催化的溶胶-凝胶法制备了新型双苯基杂化硅胶毛细管电色谱整体柱。分别采用扫描电镜、红外光谱和压汞法对材料的结构特性进行了表征。结果表明,所制备的材料具有特定的网络结构特征,孔径主要分布在3.4μm左右,材料的总孔容为3.5 cm3/g,比表面积为145 m2/g。新型整体柱能够很好地分离烷基取代苯、稠环芳烃、取代苯胺和硝基苯酚异构体。整体柱重复性实验表明,6种苯的同系物保留时间和容量因子的相对标准偏差分别小于0.61%和0.30%(n=8)。不同批次的整体柱的保留时间和容量因子的相对标准偏差分别小于7.2%和5.6%(n=3)。     

Evolution of Cooperation in Continuous Prisoner's Dilemma Games on Barabasi-Albert Networks with Degree-Dependent Guilt Mechanism

This paper studies the continuous prisoner's dilemma games (CPDG) on Barabasi-Albert (BA) networks. In the model, each agent on a vertex of the networks makes an investment and interacts with all of his neighboring agents. Making an investment is costly, but which benefits its neighboring agents, where benefit and cost depend on the level of investment made. The payoff of each agent is given by the sum of payoffs it receives in its interactions with all its neighbors. Not only payoff, individual's guilty emotion in the games has also been considered. The negative guilty emotion produced in comparing with its neighbors can reduce the utility of individuals directly. We assume that the reduction amount depends on the individual's degree and a baseline level parameter. The group's cooperative level is characterized by the average investment of the population. Each player makes his investment in the next step based on a convex combination of the investment of his best neighbors in the last step, his best history strategies in the latest steps which number is controlled by a memory length parameter, and a uniformly distributed random number. Simulation results show that this degree-dependent guilt mechanism can promote the evolution of cooperation dramatically comparing with degree-independent guilt or no guilt cases. Imitation, memory, uncertainty coefficients and network structure also play determinant roles in the cooperation level of the population. All our results may shed some new light on studying the evolution of cooperation based on network reciprocity mechanisms.     

深度非弹性散射中QCD-瞬子末态的熵及热平衡性质

在蒙特-卡洛产生器 QCDINS 产生的瞬子参与的e-P深度非弹性散射事件中,用$r$ 排序法得到瞬子末态和喷注样本。研究了 R\'enyi熵$H_2$在快度空间中的标度性和相加性。在瞬子末态中观察到了 $H_2$ 随着相空间尺度的减小展现出来的渐进标度性。相比之下,喷注的$H_2$在相空间尺度减小时呈现出饱和趋势。而且,在瞬子末态中还观察到在不同快度位置的窄窗口中$H_2$的相加性很好地成立。这些结果表明,在瞬子参与的深度非弹性散射中的瞬子末态达到了局域平衡。     

溶液沉淀法制备ZnS-氟碳聚合物电纺纤维光催化复合材料

利用含有羧基的氟碳聚合物电纺纤维为载体和模板材料,常温溶液条件下利用均匀沉淀法,在纤维表面负载硫化锌纳米粒子。通过控制反应条件,得到氟碳聚合物电纺纤维表面均匀分布、无团聚的直径在十几纳米左右的硫化锌-氟碳聚合物电纺纤维光催化复合材料。光催化复合材料的高比表面积和水中有机物富集能力使其在紫外光辐照条件下对次甲基蓝降解效率明显高于ZnS粉体。重复降解实验显示复合材料具有较好的稳定性和重复光催化能力。     

Electrical characteristics of MOS capacitor with HfTiON gate dielectric and HfTiSiON interlayer

The paper reports that HfTiO dielectric is deposited by reactive co-sputtering of Hf and Ti targets in an Ar/O₂ ambience, followed by an annealing in different gas ambiences of N₂, NO and NH₃ at 600℃ for 2 min. Capacitance--voltage and gate-leakage properties are characterized and compared. The results indicate that the NO-annealed sample exhibits the lowest interface-state and dielectric-charge densities and best device reliability. This is attributed to the fact that nitridation can create strong Si \equiv N bonds to passivate dangling Si bonds and replace strained Si--O bonds, thus the sample forms a hardened dielectric/Si interface with high reliability.