A Solid Ag Film Deposited from Solution on Self—assembled Mercaptopropyltrimethoxysilane （MPTS） Monolayer

Mercaptopropyltrimethoxysilane (MPTS) bearing mercapto groups was used to form self-assembly monolayers (SAMs) on glass substrates by solution extraction.SEM,XRD and rubbing test analysis illustrated that the Ag film on the SAMs-modified glass was more durable than that on the commonly-modified glass and that the crystallinity of Ag film on the SAMs-modified glass was identical with those of the Ag film on the commonly-modified glass and pure Ag.     

面向有机薄膜晶体管的紫外/红外光退火的溶液法氧化锆薄膜性能研究

首先引入新型油酸配位剂,解决已有溶液法成膜较差的问题,接着引入紫外/红外双光源退火工艺,制备了氧化锆薄膜。与传统的热退火工艺相比,双光源退火能够在较低温度下实现锆盐的分解、还原、氧化,形成高质量氧化锆薄膜。采用紫外分光光度计、原子力显微镜和X射线光电子能谱仪等对制备的氧化锆薄膜进行了表征对比,进而分析了成膜的物理机理。结果表明:所用方法成功实现了低温条件下(<120℃)高质量氧化锆薄膜的制备,薄膜的光学带隙约为5.66 e V,相对介电常数约为22.6,漏电流密度小于10-9 A/cm2@4 MV/cm,表面粗糙度为0.28 nm。最后,基于该氧化锆薄膜绝缘层制备出了低驱动电压的稠合噻吩-吡咯并吡咯二酮聚合物薄膜晶体管,其迁移率为0.50 cm2/(V·s),阈值电压为-0.47 V,电流开关比3.6×107,亚阈值摆幅为0.16 V/dec。     

极谱法研究金属配合物时滴汞电极表面配位剂平衡浓度的一般表达式

在金属配合物的极谱研究中,往往需要知道配位剂 X~b-在汞滴表面的平衡浓度[X]_o.作者曾用扩散电流理论,在配位剂 X(b-)与 H~ 不配合时,导出了一个金属离子各级单核配合物在汞滴表面还原为汞齐时的[X]_0表达式.最近,作者又得到了一个普适性更好的[X]_0表达式.它不仅能把文献中更多的[X]_0表达式在同一理论基础上统一起来,而且还可在新的条件下得到一系列新的[X]_0表达式.表达式的推导设在所讨论的缓冲溶液中,加有高价金属离子 M~(n )(M),低价金属离子 M~((n-a) )(M′),配位剂 X~(b-)(X)和足量的支持电解质.在溶液本体中和汞滴表面上,X~(b-)分别与 M~(n )、M~((n-a) )、氢离     

Different J-Type Aggregates of meso-Tetrakis （4-hydroxyphenyl） porphyrin （H2THPP） Formed in Different Solvents

The aggregation of meso-tetrakis(4-hydroxyphenyl)porphyrin (H2THPP) in dimethylformamide (DMF)-water solution and in DMF-chloroform solution was studied by UV-vis absorption spectroscopy. The red shift of Soret band indicates the formation of J-type aggregates of H2THPP in these two solutions. However, different shift extent of Sorer band, 12 nm in DMF-water solution and 32 nm in DMF-chloroform solution, implies structural difference between these two J-type aggregates. The hydrogen bond between hydroxyl group and N-H bonds in porphyrin ring is thought as the main cause to the formation of J-type aggregate in DMF-chloroform solution, whereas the π-Q interaction between two adjacent porphyrin cores is thought as the main cause of the formation of J-type aggregate in DMF-water solution     

铝酸钠溶液中超声诱致自由基的检测

文首次应用自由基捕获方法和电子顺磁共振技术(EPR),检测铝酸钠溶液在超声波空化作用下产生的羟自由基.本实验利用DMPO捕获羟自由基而生成寿命较长的DMPO-OH这一特性,分析了超声输出功率、超声处理时间等对DMPO-OH的自旋共振谱图中对称振动峰强弱的影响.实验结果表明:当超声输出功率达到或超过空化阈值,过饱和中等浓度铝酸钠溶液中水分子可裂解为羟自由基和氢原子自由基;同时自由基的产量与超声输出功率、超声作用时间以及溶液浓度有关.     

Investigation of Quantitative Relationship between Adsorbed Amount of Solute and Solvent Concentration at Relatively High Solute Con－centration by Frontal Analysis in RPLC

In previous paper a new adsorption isotherm which relates the amount of solute absorbed to the solvent concentration is pro-posed and simplified, and it only can be used at lower solute concentration. In this article the scope of the new adsorption isotherm is extended and the expressions with three and four parameters are obtained. The equations with multi-parameters are valid when the adsorbed mounts are larger and show non-linear logarithmic relationships. Tests with a homologue of are-matic alcohols by frontal analysis in reversed phase liquid chro-matography demonstrate that the experimental results fit those equations well. In addition, the predicted values by the multi-parameters were found to fit the experimental values well also. The parameters have physical meaning only for the two-param-eter equation for the aromatic alcohols.