Electrochemical Characterization of a Pyrolytic Carbon Film Electrode and the Effect of Anodization

A pyrolytic carbon (PC) film electrode was fabricated by the chemical vapor deposition (CVD) method. This report deals with the preparation, characterization and electrochemical behavior of this carbon film. Cyclic voltammetry, linear sweep voltammetry, Raman spectroscopy and scanning electron microscopy were employed to characterize the electrode. Low background current and capacitance were observed and the rate of charge transfer for Fe(CN) redox couple was determined via cyclic voltammetry. Also the effect of the anodic activation on the electrochemical activity was evaluated and characterized with respect to the sequence of voltage applied to the electrode. The excellent electrochemical activity and low background current are the reasons why this electrode is attractive for electroanalysis measurements with lower detection limit.     

Tetrachlorinated Tetraazaperopyrenes (TAPPs): Highly Fluorescent Dyes and Semiconductors for Air‐Stable Organic n‐Channel Transistors and Complementary Circuits

A range of 2,9‐perfluoroalkyl‐substituted tetraazaperopyrene (TAPP) derivatives ( 1 – 5 ) was synthesised by reacting 4,9‐diamino‐3,10‐perylenequinone diimine (DPDI) with the corresponding carboxylic acid chloride or anhydride in the presence of a base. The reaction of compounds 1 – 4 with dichloroisocyanuric acid (DIC) in concentrated sulphuric acid resulted in the fourfold substitution of the tetraazaperopyrene core, yielding the 2,9‐bisperfluoroalkyl‐4,7,11,14‐tetrachloro‐1,3,8,10‐tetraazaperopyrenes 6 – 9 , respectively. The optical and electrochemical data demonstrate the drastic influence of the core substitution on the properties. All compounds are highly luminescent (fluorescence quantum yields of up to Φ=0.8). The LUMO energies of the tetrachlorinated TAPP derivatives (determined by cyclic voltammetry and computed by DFT calulations) were found to be below ?4 eV. In the course of this work the performance of TAPP derivatives in organic thin‐film transistors (TFTs) was investigated, and their n‐channel characteristics with field‐effect mobilities of up to 0.14 cm² V^?1 s^?1 and an on/off current ratio of >10⁶ were confirmed. Long‐term stabilities of 3–4 months under ambient conditions of the devices were established. Complementary inverters and ring oscillators with n‐channel TFTs based on compound 8 and p‐channel TFTs based on dinaphtho‐[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (DNTT) were fabricated on a glass substrate.     

双亲性希土-邻苯二甲酸正十四醇单酯-邻菲咯啉三元配合物的合成、表征、荧光特性及成膜性能

合成了双亲性的铕、铽-邻苯二甲酸正十四醇单酯-邻菲咯啉三元混配配合物，用红外光谱及差热-热重谱进行了表征。考察了发光性能。研究了它们在空气-水界面上的单分子膜行为，结果表明均具有良好的成膜行为。     

Novel fabrication of net-like and flake-like Fe doped TiO2 thin films

New morphologies of net-like and flake-like TiO₂ thin films with different concentrations of Fe dopant were successfully fabricated by micro-arc oxidation (MAO) process of Ti plates and a subsequent chemical treatment of the as-prepared MAO-TiO₂ thin films. It was found that Fe ions can be easily introduced into the MAO-TiO₂ samples with the increase concentration of K₄(FeCN)₆·3H₂O precursor, and the amount of Fe determined the morphologies of TiO₂ thin films after chemical treatment; net-like morphology was observed with low Fe dopant, while it transformed to a flake-like one when Fe exceeds 1.7 at.%. UV-vis spectroscopy test showed that the absorption edge of the Fe ions doped TiO₂ thin films with new morphologies has an obvious red shift.     

10,12—双炔廿三酸盐的LB膜特性研究

本文合成了10,12-双炔廿三酸,并用其在Si、SiO_2、CaF_2等基片上沉积了LB膜,结果表明,10,12-双炔廿三酸的镉盐成膜更稳定。这种LB膜在紫外光辐照下很快聚合,聚合前后的紫外-可见吸收光谱发生规律性的变化,并保持层状结构,等同周期稍变。通过红外吸收的二向色性分析,确定了该分子的取向。     

Deposition of complex multielemental thin films

Modern condensed-matter physics is increasingly concerned with the design, synthesis, analysis, and exploitation of chemically complex materials and structures. Complex metal oxides and strongly correlated electron systems such as YBa₂Cu₃O_7−x and La_1−xSr_xMnO₃ are paradigmatic examples. Their production in the form of high-quality thin films is of both technological and fundamental importance and has stimulated a concerted effort in the last two decades to find and optimize efficient techniques to this end. This review discusses the physics behind and the requirements for synthesizing high-quality films of such materials and examines fundamental aspects of the growth processes associated with magnetron sputtering and pulsed laser deposition, the two techniques which presently offer the best solutions in this burgeoning field.     

多孔载体上纯相MgAPO-36和CoAPO-36分子筛膜的合成与表征

<正>分子筛膜具有与常见气体和溶剂分子大小相当的规则孔道结构,良好的热稳定性和催化性能,可用于强化气体混合物分离[1-2]和膜反应过程[3-4]。到目前为止,沸石分子筛膜(如BEA、LTA和MFI型)和磷铝分子筛膜(如AEI、AFI和CHA型)相关的研究工作均有大量报道[5],但ATS型磷酸铝分子筛薄膜的合成与应用研究仍未见公开报导。     

以SBA-16为模板电沉积生长多孔氧化铁纳米线阵列

采用电化学沉积法以Mn改性的三维体心立方结构的介孔SBA-16膜为模板制备Fe纳米线.沉积Fe后的SBA-16膜以2%HF溶解SiO₂骨架,样品于550℃焙烧4 h.SEM和TEM的研究结果显示,所制备的Fe₂O₃纳米线互相平行,孔径均匀.XRD、电子衍射及HRTEM研究表明Fe₂O₃纳米线具有(多孔)单晶结构.     

Optical and hydrophilic properties of Cr doped TiO2-SiO2 nanostructure thin film

Cr doped TiO₂-SiO₂ nanostructure thin film on glass substrates was prepared by a sol-gel dip coating process. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the structural and chemical properties of the films. A UV-vis spectrophotometer was used to measure the transmittance spectra of the thin film. The hydrophilicity of the thin film during irradiation and storage in a dark place was measured by a contact angle analyzer. The results indicated that Cr doping has a significant effect on the transmittance and super-hydrophilicity of TiO₂-SiO₂ thin film.     

ZrO2/SiO2溶胶-凝胶薄膜膜层间的渗透行为

分别以丙醇锆和正硅酸乙酯为原料,采用溶胶-凝胶工艺制备了性能稳定的ZrO2和SiO2溶胶。用旋转镀膜法在K9玻璃上分别制备了单层SiO2薄膜、单层ZrO2薄膜、ZrO2/ SiO2双层膜和SiO2/ZrO2双层膜。采用原子力显微镜观察了薄膜的表面形貌,用椭偏仪测量薄膜的厚度与折射率,用紫外-可见光分光光度计测量了薄膜的透射率。对薄膜的透射光谱和椭偏仪模拟的数据进行分析,发现SiO2/ZrO2双层膜之间的渗透十分明显,而ZrO2/SiO2双层膜之间几乎不发生渗透。利用TFCalc模系设计软件,采用三层膜模型对薄膜的透射率进行模拟,得出的透射曲线与用紫外-可见光分光光度计测量的透射曲线十分符合。