掺铒硅多孔化后的光致发光特性

采用一种新的方法制备掺Er多孔硅.首先通过分子束外延法生长Er,O共掺的硅外延层,然后通过常规的电化学阳极腐蚀法将外延层制备成掺Er离子的纳米硅柱结构.由于实现了Er离子在多孔硅中沿深度方向的均匀分布,得到峰宽仅6nm的Er3+本征发光.同时,由于铒与氧共掺于硅柱内部,多孔硅不再需要通过高温后处理引入氧来实现铒的光学激活.实验还对多孔化前后,Er3+的发光强度作出直观的比较,讨论多孔硅可见光及红外光区域的发光对Er3+红外发射的影响. 关键词：     

MOCVD生长的GaN单晶膜的蓝带发光研究

对实验室用ＭＯＣＶＤ方法生长的未掺杂ＧａＮ单晶膜的发光性能进行了研究。结果表明：在室温时未掺杂ＧａＮ单晶出现的能量为２．９ｅＶ左右蓝带发光与被偿度有较强的依赖关系。高补偿ＧａＮ的蓝带发射强,低补偿ＧａＮ的蓝带发射弱。对蓝带发光机理进行了探讨,认为蓝 导带电子过至受主能级的发光（ｅＡ发光）。观察到降低ＧａＮ补偿度能提高ＧａＮ带边发射强度。     

国外城市垃圾填埋场岩土工程研究的最新进展

介绍了国外在垃圾填埋场衬垫层、覆盖系统 (帽子 )、垂直隔离墙及土工布等方面的最新进展.     

决策单元的变更对共协调性的影响

本文将对共协调分析的灵敏度问题进行研究,着重探讨决策单元的变更对共协调性的影响。     

周边固支圆板非线性热弹耦合振动分析

导出了轴对称圆板非线性热弹耦合自由振动基本方程,对周边固支圆板运用伽辽金法求解,得出振幅随时间变化的数值解.将热弹耦合与非热弹耦合情况进行对比,发现振幅较小时,热弹耦合效应使板的固有频率相对于无热弹耦合情形提高;振幅较大时,热弹耦合效应使固有频率降低.最后比较了不同热弹耦合参数对应的振动情况.     

单核、对称双核钌配合物在铂电极上的电化学行为

利用循环伏安、循环交流伏安和微分电容测定等电化学方法研究了由2,2'-联吡啶(bpy)和桥联配体1,4-二(2-咪唑并[4,5-f][1,10]邻菲咯啉)苯(DIPB)配位而成的单核钌配合物[Rul:Ru(bpy)~2(DIPB)(ClO~4)~2]和对称双核钌配合物[Ru2:(bpy)~2Ru(DIPB)Ru(bpy)~2(ClO~4)~4]在铂电极上的电化学行为。研究结果表明,在0.1mol/L高氯酸四丁基铵(TBAP)的乙腈溶液中,这两种配合物的中心钌离子在铂电极上均呈现一对氧化还原峰,而配体2,2'-联吡啶则呈现两对氧化还原峰。单核Ru1和双核Ru2所对应的各组氧化还原峰分别符合可逆的单电子和二电子传递反应过程的特征,所对应的条件电位(FormalPotential)Ru2较ru1有轻微正移。Ru1和Ru2所对应的配位阳孩子的扩散系数分别为9.93×10^-^6cm^2/s和3.50×10^-^6cm^2/s。在循环交流法和微分电容法确定的时间量程内,两中心钌离子在桥联配体间的电子传递过程较它与电极间的慢。     

基质辅助激光解吸电离飞行时间质谱研究2: 四硫 富瓦烯化合物

采用基质辅助激光解吸电离飞行时间质谱(MALDI-TOF-MS),对四硫富瓦烯化合物进行质谱表征。在所用的实验条件下,样品很容易解吸电离生成单电荷分子离子,得到单同位素分辨的质谱图。26种实际样品的质谱分析结果表明;MALDI-TOF-MS可以比其它质谱方法更有效、更方便地用于此类化合物的质谱分析,解决了此类化合物不易进行质谱鉴定的难题。     

基质辅助激光解吸电离飞行时间质谱研究Ⅱ.四硫富瓦烯化合物

采用基质辅助激光解吸电离飞行时间质谱(MALDI-TOF-MS),对四硫富瓦烯化合物进行质谱表征.在所用的实验条件下,样品很容易解吸电离生成单电荷分子离子,得到单同位素分辨的质谱图.26种实际样品的质谱分析结果表明:MALDI-TOF-MS可以比其它质谱方法更有效、更方便地用于此类化合物的质谱分析,解决了此类化合物不易进行质谱鉴定的难题.     

Nano-Patterning via Molecular Self-Assembly

Surface patterning with microscopically defined structures is a rapidly developing topic, although it is still a challenge for generating patterned surface in the size range of nanometer. Molecular assemblies normally in the size range of 1 to 102 nm should overcome easily the conventional lithographic limit. Although many techniques have been developed to generate patterned surface, surface patterning totally directed by molecular self-assembly has been less addressed. For this purpose, ways of molecular self-assembly to generate regular arrays of nanostructures have been demonstrated in our laboratory including chemisorption of dendron-thiols,surface adsorption of bolaform amphiphiles, and nano-phase separation of rod-coil diblock molecules. As to be discussed, molecular self-assembly is an alternative but effective way to produce patterned structures, particularly in the range of a few nanometers.     

Photo-electrochemically Synergetic Effect in the Catalytic Degradation of Reactive Dyes

The dye wastewater has a high potential environmental impact principally due to the wastewater containing high organic charge and strong coloration. As far as back the 1980s, the totals of synthesized dyes have been more than 800 thousand tons every year in the whole would. However, in the all of dyes, reactive dyes represent an important fraction of the commercialized synthetic pigments used. The major environmental problem associated with the use of the reactive dyes is their loss in the dyeing processes with general low fixation efficiency, large mount of dye-containing wastewater was inevitably discharged into water supply. So, the treatment of wastewater containing reactive dyes is very urgent for our health.