Effect of gold nanoparticles on the performances of the phosphorescent organic light-emitting devices

Gold nanoparticles (GNPs) on the performance of the phosphorescent organic light-emitting devices (OLEDs) were investigated. The green phosphorescent OLEDs with GNPs incorporated in hole transporting layer (HTL) or hole blocking layer (HBL) were fabricated using thermal evaporation technique. The results indicated that the performance of the OLEDs with GNPs were dependent on the position of the GNPs. The optimized device with GNPs in HBL shows enhanced current efficiency and reduced efficiency roll-off. However, the efficiency of the device with GNPs in HTL was decreased. The detailed physical mechanism is investigated in order to unveil such difference.     

金纳米粒子和钼氧化物复合膜修饰电极的制备及应用 (cited: 1)

利用循环伏安法将金纳米粒子和钼氧化物共同电沉积在玻碳电极表面,制备了金纳米粒子和钼氧化物复合膜修饰电极,利用SEM和XPS研究了MoO_x/AuNPs复合膜的表面形态,并研究其修饰电极对葡萄糖的电催化氧化过程. 首次提出了阳极扫描极化反向催化伏安法,即在反向扫描过程中纯的催化氧化电流通过扣减背景电流的方法被提取出来. 显著提高电流测量灵敏度改善了信噪比. 制备的MoO_x/AuNPs复合膜修饰电极在0.01～4.0 mmol/L对葡萄糖具有线性响应,电流灵敏度为2.35 mA·L/(mmol·cm²),检测限为9.01 μmol/L(信噪比为3).     

Investigation into the voltammetric behaviour and detection of selenium(IV) at metal electrodes in diverse electrolyte media

The voltammetric behaviour of selenium(IV) was studied at platinum and gold electrodes in sulphuric acid, perchloric acid and potassium chloride media as a basis for its voltammetric detection. The best voltammetric behaviour was recorded at gold electrodes with perchloric acid as the supporting electrolyte. The concomitant presence of metals, such as copper or lead, and of model biomolecules, such as bovine serum albumin, in the solution resulted in a deterioration of the electrochemical response for selenium(IV). Quantitative detection of selenium(IV) by square wave anodic stripping voltammetry at both a millimetre-sized gold disc electrode and a microband electrode array revealed linear responses to selenium concentration in the ranges 5–15 μM and 0.1–10 μM, respectively, with 60 s preconcentration. The sensitivities were 6.4 μA μM⁻¹ cm⁻² and 100 μA μM⁻¹ cm⁻² at the disc and the microband array, respectively. The detection limit at the microband electrode array was 25 nM, illustrating the potentiality of such microelectrodes for the development of mercury-free analytical methods for the trace detection of selenium(IV).     

以C60为媒介的网状金纳米粒子聚集体的构筑

通过全甲基化环糊精和卟啉之间的"Click"反应,合成了一种不对称环糊精修饰的卟啉衍生物,并对其结构进行了表征.该化合物与氯金酸作用可以形成平均粒径为5 nm的水溶性金纳米粒子,该金纳米粒子进一步与C60作用形成网状纳米聚集体,并通过紫外光谱和透射电子显微镜验证了聚集体的结构.     

高活性Au/SnO2催化剂的制备及其在1,4-丁二醇氧化制γ-丁内酯反应中的催化应用

采用沉积沉淀法制备了一系列商业SnO₂负载的纳米Au催化剂, 通过电感耦合等离子体发射光谱、X射线粉末衍射、透射电镜和X射线光电子能谱等方法研究了溶液酸碱性、沉淀剂种类、Au负载量和焙烧温度等对催化剂性质的影响.结果表明, Au的负载量以及催化剂的焙烧温度对Au颗粒状态有较大影响.其中, 于573 K焙烧的3%Au/SnO₂催化剂在1,4-丁二醇氧化制备γ-丁内酯反应中的催化活性最好, TOF值是Au/TiO₂催化剂的15倍.这主要是由于SnO₂载体独特的性质对所负载的Au颗粒的影响.     

Gold and Silver Complexes with Thiotriazoles and Thiotetrazoles

Abstract

The potential of thiotriazoles and thiotetrazoles in coordination chemistry towards gold and silver derivatives still remains largely unfulfilled. These substrates can function as ideal S,N donor ligands and form covalent or coordinative bonds with gold and silver. Relying on this, a comprehensive overview in this field is given in the article and basic principles are discussed.

GRAPHICAL ABSTRACT      

pH诱导两性离子配体修饰的金溶胶的浓缩与保存

研究了两性离子配体修饰的金纳米颗粒在酸性和碱性溶液中的稳定性和可逆聚集性. 测量了金溶胶在不同条件下的UV-Vis 吸收光谱, 通过光谱的变化揭示其稳定性和可逆聚集性. 结果表明: 经配体修饰的金纳米颗粒在酸性和碱性溶液中的稳定性有了很大的提高; 强酸性条件可诱导金溶胶失稳聚沉, 回调pH值又可使其重新分散. 利用这种pH依赖的可逆聚集特性, 可以将稀溶胶浓缩成浓溶胶或固体保存, 一旦需要又可加水恢复到分散的状态.     

微接触印刷技术在ITO基底上快速转移Au纳米粒子图案

采用无氰化学镀金法在聚二甲基硅氧烷(PDMS)印章表面镀金, 通过微接触印刷技术将PDMS印章上的Au 纳米粒子(AuNPs)分别转移到氧化铟锡(ITO)透明导电膜玻璃, 修饰了(3-巯基丙基)三甲氧基硅烷(MPTMS)的ITO基底(MPTMS/ITO)和表面电镀了铜膜的ITO(Cu/ITO)表面上, 同时形成有序的结构或者图案.通过场发射扫描电镜(FE-SEM), 原子力显微镜(AFM)和显微共聚焦激光拉曼光谱仪等对实验结果进行表征.结果表明, 该转移AuNPs的方法对基底表面特性并无特殊要求, 是一种简单、快速、无污染、低成本的AuNPs转移技术, 而且转移了AuNPs的ITO基底具有表面增强拉曼光谱(SERS)活性, 有望在SERS中有所应用.