CCD技术应用于研究物理显影过程

本文使用一个线性CCD器件,通过反射光强(Intensity)随CCD单元及反应时间的变化,直接监测感光化学中银盐扩散转移体系中的物理显影过程,主要研究了加工液组分对物理显影的影响。实验结果表明,当使用KSCN作为银络合剂时,对苯二酚为显影剂,物理显影速率随络合剂浓度的增加而增加,随显影剂浓度的增加而下降;用Na₂S₂O₃为络合剂时,其结果相反;当用尿嘧啶为银络合剂时,显影剂浓度在0.1mol/L时反射光强出现最佳值。与此同时还研究了保护剂、溶液pH值等条件的影响。本文证明了CCD方法用于研究物理显影是可行的。     

三氟化硼乙醚中二甲基甲撑二氧苯的电化学聚合

在三氟化硼乙醚中通过阳极氧化二甲基甲撑二氧苯获得了新型导电高分子聚(二甲基甲撑二氧苯)。二甲基甲撑二氧苯的起始氧化电位是0.7 V(vs SCE),远小于在含0.1 mol/L四氟化硼四丁基铵的乙腈中的起始氧化电位1.57 V(vs SCE)。聚合物的电导率为0.23 S/cm。红外和核磁表明聚(二甲基     

不同电位影响5-硝基吲哚电化学聚合的光谱分析

三氟化硼乙醚+10%乙醚体系中,恒电位(1.23～2.23 V vs.SCE)条件下可以获得高质量聚膜(PNI),这是首次获得硝基取代高性能导电高分子膜材料。5-硝基吲哚(NI)的起始氧化电位为1.04 V vs.SCE。电流-时间曲线、FTIR和1H NMR结果均表明聚合电位对PNI膜质量有较大影响。低电位有利于NI的聚合,且有利于增加PNI膜的共轭链长;高电位会导致NI的副反应,从而降低PNI膜的质量。同时红外光谱和1H NMR研究表明,NI的电化学聚合是通过2, 3位进行的。     

9,9-二辛基芴的电化学聚合

在三氟化硼乙醚(BFEE)中, 9,9-二辛基芴可以直接阳极氧化制备高质量聚(9,9-二辛基芴)膜, 其电导率为1×10^－2 S/cm. 9,9-二辛基芴在BFEE中的起始氧化电位为1.25 V vs. SCE, 低于单体在0.1 mol/L Bu₄NBF₄的乙腈溶液体系中的起始氧化电位(1.52 V vs. SCE). BFEE中获得的聚(9,9-二辛基芴)膜具有良好的电化学性质. 聚合物部分溶于氯仿、四氢呋喃、二甲基亚砜等极性溶剂. FTIR和¹H NMR表明聚合反应主要发生在2,7位. 荧光光谱表明聚合物是一种良好的蓝色荧光物质.     

四氢呋喃/三氟化硼乙醚混合电解质中咔唑的电化学聚合

在四氢呋喃/三氟化硼乙醚混合电解质中直接阳极氧化咔唑制备聚咔唑.单体的起始氧化电位为0.92 Vversus SCE,远低于单体在含0.1 mol.L-1Bu4NBF4的乙腈溶液中的起始氧化电位(1.36 Vversus SCE).在此体系中获得的聚咔唑膜具有良好的电化学活性和稳定性,其电导率为7.0×10-3S.cm-1.聚合物可部分溶解于二甲基亚砜等强极性有机溶剂.UV-Vis,FT-IR,1H-NMR证明聚合物共轭长链的形成.该体系中获得的聚咔唑是一种蓝光发射材料,并具有良好的热稳定性.     

Electrosynthesis and characterization of aminomethyl functionalized PEDOT with electrochromic property

We herein report the electrosynthesis of an aminomethyl functionalized poly(3,4-ethylenedioxythiophene)(PEDOT) derivative, poly(2'-aminomethyl-3,4-ethylenedioxythiophene)(PEDOT-Me NH2), in CH2Cl2-Bu4NPF6(0.1 mol·L-1) system containing 2% boron trifluoride diethyl etherate(BFEE). The electrochemical behavior, structure characterization, thermal properties and surface morphology of this novel polymer were systematically investigated by cyclic voltammetry(CV), Fourier-transform infrared spectroscopy(FTIR), thermogravimetry(TG) and scanning electron microscopy(SEM), respectively. Electrochemistry results demonstrated that PEDOT-Me NH2 film displayed good redox properties and high electrochemical stability. Besides, PEDOT-Me NH2 films exhibited the electrochromic nature with obvious color changing from purple in the reduced form to blue upon oxidation. By further investigation, kinetic studies revealed that PEDOT-Me NH2 film had decent contrast ratio(41.8%), favorable coloration efficiency(152.1 cm2·C-1), low switching voltages and moderate response time(2.4 s). Satisfactory results implied that the obtained PEDOT-Me NH2 film is a promising optoelectronic material and holds promise for electrochromic devices and display applications.     

Thermoelectric transport in conductive poly(3,4-ethylenedioxythiophene)

Poly(3,4-ethylenedioxythiophene)(PEDOT)has proved its quite competitive thermoelectric properties in flexible electronics with its excellent electrical and mechanical properties.Since the early discovery of PEDOT,considerable experimental progress has been achieved in optimizing and improving the thermoelectric properties as a promising organic thermoelectric material(OTE).Among them,theoretical research has made significant contributions to its development.Here the basic physics of conductive PEDOT are reviewed based on the combination of theory and experiment.The purpose is to provide a new insight into the development of PEDOT,so as to effectively design and preparation of advanced thermoelectric PEDOT material in the future.     

Graphene Oxide Doped Poly（hydroxymethylated-3,4- ethylenedioxythiophene）： Enhanced Sensitivity for Electrochemical Determination of Rutin and Ascorbic Acid

A novel graphene oxide doped poly(hydroxymethylated-3,4-ethylenedioxythiophene)(PEDOT-MeOH/GO) composite film was synthesized and utilized as an efficient electrode material for simultaneous detection of rutin and ascorbic acid(AA). PEDOT-MeOH/GO films were synthesized on glassy carbon electrode(GCE) by a facile one-step electrochemical approach and were characterized by scanning electron microscopy, UV-Vis spectroscopy, FTIR spectra and electrochemical methods. Then the PEDOT-MeOH/GO/GCE was applied successfully in the simultaneous detection of rutin and AA. The results showed that the oxidation peak currents of rutin and AA obtained at the PEDOT-MeOH/GO/GCE were much higher than those at the traditional conducting polymer PEDOT/GO/GCE, PEDOT-MeOH/GCE, PEDOT/GCE and bare GCE. Under optimized conditions, the linear ranges for rutin and AA are 20 nmol/L-10 μmol/L and 8 μmol/L-1 mmol/L, respectively. The detection limit is 6 nmol/L for rutin and 2 μmol/L for AA(S/N = 3), which are lower than those of the reported electrochemical sensors.     

Poly(thiophene-3-acetic acid)-palladium nanoparticle composite modified electrodes for supersensitive determination of hydrazine

 A promising electrochemical sensor was fabricated by electrodeposition of Pd nanoparticles (PdNPs) on poly(thiophene-3-acetic acid) (PTAA)-modified glassy carbon electrode (GCE), forming a PdNPs/PTAA composites-modified GCE (PdNPs/PTAA/GCE). Scanning electron microscope (SEM) and electrochemical techniques were used for the characterization of these composites. It was found that the PdNPs/PTAA layer was very uniform. Electrochemical experiments showed that this proposed PdNPs/PTAA composites-modified electrode exhibited excellent electrocatalytic activity towards the oxidation of hydrazine. Under the optimum conditions, the proposed sensor can be applied to the quantification of hydrazine with a wide linear range from 8.0?10^-9 mol/L to 1.0?10^-5 mol/L with a low detection limit of 2.67?10^-9 mol/L. The experiment results also showed that the sensor exhibited good reproducibility and long-term stability, as well as high selectivity with no interference from other potential competing species.     

Thermoelectric Performances of Free-Standing Polythiophene and Poly（3-Methylthiophene） Nanofilms

Thermoelectric performances of free-standing polythiophene （PT） and poly（3-methylthiophene） （PMeT） nanofilms with high tensile strength electrosynthesized from boron trifluoride diethyl etherate （BFEE） are systematically investigated. They display decent electric conductivity （47 and 73S.cm^-1）, high Seebeck coefficient （130 and 76μV.K^-1） and low thermal conductivity （0.17 and 0.15 W.m^-1.K^-1） at room temperature. Their figure of merit can reach 3.0 × 10^-2 at 250K, higher than that of many other conducting polymers. The decrease of charge carrier concentration resulting from volatile and water-sensitive dopants from BFEE leads to the decrease of electrical conductivity but a substantial increase of the Seebeck coet~cient, making their figure-of-merit values maintained at more than 10-2 even after prolonged storage （two months）. Moreover, free-standing PT and PMeT exhibit much better thermoelectric performances than those in pressed pellets due to the good arrangement of the polymer chains and preferably oriented structure in films. It therefore provides a way to improve the thermo- electric performances of conducting polymers by controlling regularity of the extended conjugated chain structure and/or the chain packing to achieve high charge mobility.