导电聚合物有序超薄膜性质

采用修饰多层LB膜的方法制备导电聚合物聚3,4乙烯二氧噻吩/聚苯乙烯磺酸(PEDOT-PSS)/十八胺(ODA)及硬脂酸(SA)复合层状有序膜.实验表明,PEDOT-PSS纳米粒子对单分子层具有包裹作用,形成了稳定的复合单分子膜;二次离子质谱(SIMS)和小角x射线反射(XRR)分析表明ODA-SA/PEDOT-PSS...     

导电聚合物有序超薄膜合成工艺的优化

采用Langmuir-Blodgett(LB)诱导沉积方法制备了不同层数的聚(3,4-乙烯二氧噻吩)/聚苯乙烯磺酸(PEDOT-PSS)导电复合膜。首次研究了十八胺(ODA)和十八胺/硬脂酸(SA)离子化单分子膜在PEDOT-PSS纳米粒子亚相及ODA/PEDOT-PSS组装体在纯水亚相上的成膜行为。实验表明:PEDOT-PSS纳米粒子对单分子层具有包裹作用,形成了稳定的复合单分子膜;不同膜压下制备的膜表面形貌不同,较高膜压下得到颗粒紧密排列的薄膜,亚相温度23℃,PEDOT-PSS浓度1×10-4mol/L,压缩速率5 mm/min,拉膜速率为1 mm/min的条件下薄膜具有较好的成膜性能。     

3,4-二氧乙基噻吩及其聚合物的制备与应用进展

聚(3,4-二氧乙基噻吩)(PEDOT)是目前发现的导电态最稳定的导电高分子之一,对聚PEDOT及其单体3,4-二氧乙基噻吩(EDOT)的制备方法进行了综述,并介绍了PEDOT在抗静电、电解电容器、有机光电材料和传感器领域的研究和应用。     

基于电沉积导电高分子改性硫电极的Li-S电池

采用电化学法,在硫电极表面沉积一层聚(3,4–乙烯二氧噻吩)薄膜,并研究了相关锂–硫(Li-S)电池的电化学性能。结果表明,这种简单的电化学方法容易实现在整个硫电极表面制备一层致密、均匀、厚度可控的导电高分子薄膜,并且显著提高Li-S电池的循环稳定性。其中,薄膜电沉积500次时,其改性硫电极的初始放电比容量为955 mAh／g,在放电电流密度为900 mA／g时,800次充放电循环后比容量为590 mAh／g,即每个循环的容量损失率仅为0.047%。     

PEDOT复合导电浆料的制备及性能研究

3,4-乙烯二氧噻吩(EDOT)和对苯乙烯磺酸钠(SSNa)在过硫酸钾(KPS)—硫酸铁[Fe SO2 4 3x H O]作用下,通过化学氧化法合成了聚3,4-乙烯二氧噻吩/聚对苯乙烯磺酸钠(PEDOT/PSS)导电聚合物浆料,并通过2步法——乳液聚合法和化学氧化法合成了聚(对苯乙烯磺酸钠-丙烯酸丁酯-苯乙烯)P(SSNa-BA-St)三元共聚乳液和PEDOT/P(SSNa-BA-St)复合导电浆料,探讨了SSNa用量、EDOT用量和球磨机分散对复合导电浆料性能的影响,同时对2种导电膜进行了柔韧性测试。结果表明,随着SSNa用量的增大,复合导电膜的表面电阻先增大后减小;与之相反随着EDOT用量的增大,该膜的表面电阻先减小后增大;球磨分散有助于提高复合导电膜的透光率,但会导致膜的表面电阻增大;与PEDOT/PSS膜相比,PEDOT/P(SSNa-BA-St)膜的柔韧性较好。     

用聚3,4-乙撑二氧噻吩对聚丙烯腈进行导电改性的研究

采用原位化学氧化聚合方法在聚丙烯腈纤维表面生成聚3,4-乙撑二氧噻吩,制备得到纤维表面均匀覆盖聚3,4-乙撑二氧噻吩的改性导电纤维,其电导率约为1×10-3S/cm。纤维表面与导电聚合物的相互作用改善了原纤维的耐热性能,并对其力学性能没有造成伤害。     

TiS2/PEDOT:PSS复合薄膜的制备及其热电性能

高性能热电材料的开发是提升热电转换效率的关键,二硫化钛(TiS₂)是一种性能优异的二维热电材料。为进一步提高二硫化钛(TiS₂)热电性能,研究制备了夹层结构的二硫化钛(TiS₂)/聚(3,4-乙烯基二氧噻吩)：聚(苯乙烯磺酸盐)(PEDOT:PSS)复合薄膜。该复合薄膜的热电性能得到了明显的提升,其功率因子可达368.58μW·m^-1·K^-2。制备夹层结构的Ti S₂/PEDOT:PSS复合薄膜有利于得到更加规整的有机-无机异质界面,进而通过界面效应来提升复合薄膜的热电性能。     

PEDOT:PSS导电自支撑薄膜的合成与表征

以3,4-乙烯二氧噻吩(EDOT)为原料,聚对苯乙烯磺酸钠(PSS-Na)为分散剂和掺杂剂,通过化学氧化合成法在水体系中聚合制备了聚(3,4-乙烯二氧噻吩):聚苯乙烯磺酸(PEDOT:PSS)悬浮液,通过真空抽滤法制备了PEDOT:PSS自支撑柔性导电薄膜。通过FTIR、UV-Vis对聚合产物结构进行了表征与确证,通过四探针电导率测试、SEM、拉伸断裂强度测试对PEDOT:PSS薄膜的导电性、微观形貌与力学性能进行了表征。结果表明,成功制备了PEDOT:PSS目标产物,在氧化剂过硫酸铵与单体EDOT物质的量比为0.875时达到最佳电导率(19.19 S/cm)。自支撑薄膜厚度约18μm,在25℃,40%～60%相对湿度范围内拉伸强度达到45～60MPa,具有良好的导电性与机械性能。     

PEDOT:PSS导电自支撑薄膜的合成与制备

以3,4-乙烯二氧噻吩（EDOT）为原料，聚对苯乙烯磺酸钠（PSS-Na）为分散剂和掺杂剂，通过化学氧化合成法在水体系中聚合制备了聚(3,4-乙烯二氧噻吩):聚苯乙烯磺酸（PEDOT:PSS）悬浮液，通过真空抽滤的方法制备了PEDOT:PSS自支撑柔性导电薄膜。通过FTIR、UV-Vis对聚合产物结构进行了表征与确认，通过四探针电导率测试、SEM、拉伸断裂强度测试对PEDOT:PSS薄膜的导电性、微观形貌与力学性能进行了表征。结果表明，成功制备了PEDOT:PSS目标产物，在氧化剂与单体物质的量之比为0.875时达到最佳电导率（19.19 S/cm）。自支撑薄膜厚度约18 μm，在25 ℃，40%~60%相对湿度范围内拉伸断裂强度达到45~60 MPa，具有良好的导电性与机械性能。     

纳微米聚（3，4-二氧乙基噻吩）导电高分子的合成及其性能研究

在导电高分子家族中，聚（3，4-二氧乙基噻吩）（PEDOT）由于具有高的电导率、环境稳定性、透明性以及良好的成膜性等优异性能而广泛地应用于有机电致发光器件、太阳能电池、防静电、电致变色器件、传感器等领域．本论文研究了绝缘高分子聚乙二醇（PEG）和乙二醇、一缩二乙二醇等有机极性溶剂提高PEDOT／PSS（聚苯乙烯磺酸钠）电导率的机理，并通过改变稳定剂、掺杂剂等因素制备了具有不同结构和性能的PEDOT胶体颗粒以及PEDOT／PMMA（聚甲基丙烯酸酯）复合微球，取得了以下主要的创新性结果。     

Ordered and ultrathin reduced graphene oxide LB films as hole injection layers for organic light-emitting diode

In this paper, we demonstrated the utilization of reduced graphene oxide (RGO) Langmuir-Blodgett (LB) films as high performance hole injection layer in organic light-emitting diode (OLED). By using LB technique, the well-ordered and thickness-controlled RGO sheets are incorporated between the organic active layer and the transparent conducting indium tin oxide (ITO), leading to an increase of recombination between electrons and holes. Due to the dramatic increase of hole carrier injection efficiency in RGO LB layer, the device luminance performance is greatly enhanced comparable to devices fabricated with spin-coating RGO and a commercial conducting polymer PEDOT:PSS as the hole transport layer. Furthermore, our results indicate that RGO LB films could be an excellent alternative to commercial PEDOT:PSS as the effective hole transport and electron blocking layer in light-emitting diode devices.     

Gold microspheres with hierarchical structure/conducting polymer composite film: Preparation, characterization and application as catalyst

Monodisperse gold microspheres with novel hierarchical structure and their composite integrated with a conducting film obtained from a new conducting copolymer, poly(acrylonitrile-co-vinyl acetate) -graft- poly(3,4-ethylenedioxythiophene), have been successfully prepared in one step via the in-situ reduction of AuCl₄^- on the conducting film surface. The morphology and structure of the as-prepared composite film are characterized, and its catalytic effect on reduction of p-nitrophenol is investigated. By controlling the concentration of HAuCl₄ and the conductivity (or PEDOT content) of P(AN-co-VA)-g-PEDOT copolymer film, the amount and the size of gold microspheres can be effectively adjusted. It is suggested that the side poly(3,4-ethylenedioxythiophene) chains of the conducting copolymer play both reducing and structure-directing roles during the formation of Au microspheres with hierarchical structure.     

聚合物顶发射发光二极管的研究

采用铬(Cr)作为聚合物顶发射发光二极管阳极,得到了一种高效的顶发射发光器件结构。在使用铬作为器件阳极时,首先使用磁控溅射方法使其沉积在玻璃衬底表面,然后使用不同厚度PEDOT:PSS薄膜提高阳极表面的平整度,并得出当PEDOT:PSS厚度为60nm时器件具有最高效率。本实验采用聚合物P-PPV(poly[2-(4-3’,7’-dimethyloctyloxy)-phenyl]-p-pheny-lenevinylene))作为发光层。器件阴极结构为钡/银(Ba/Ag),通过不同厚度阴极的器件对比,得出阴极最适合的结构为Ba(4nm)/Ag(15nm)。此时,该结构的器件最大效率达4.41cd/A,最大效率时亮度达到738cd/m2。     

A soluble self-doped conducting polyaniline graft copolymer as a hole injection layer in polymer light-emitting diodes

We demonstrate that a novel soluble self-doped conducting polyaniline graft copolymer can be used for a hole injection layer (HIL) in polymer light-emitting diodes (PLEDs). The work function of the material (5.18 eV) was similar to that (5.20 eV) of a conventional conducting polymer dispersion, poly(3,4-ethylenedioxythiophene) (PEDOT) doped with polystyrene sulfonate (PSS). When we fabricated PLEDs by using this material, the current-voltage-luminescence characteristics were very similar to those of the device using the PEDOT/PSS. When the material was blended with PSS, the luminous efficiency was further improved up to 11.9 cd/A. Since this kind of soluble type HIL has advantages over the conventional PEDOT/PSS dispersion in terms of the solution processibility and film quality, this soluble graft-type conducting polymer can be one of the promising candidates for a HIL in PLEDs.     

Conductive composite particles synthesized via pickering emulsion polymerization using conductive latex of poly(3,4-ethylenedioxythiophene) (PEDOT) as stabilizer

In this research, poly(3,4-ethylenedioxythiophene) (PEDOT) nanoparticles less than 100 nm were synthesized first and applied as the solid stabilizer for producing PEDOT-polystyrene (PEDOT-PSt) composite latex by Pickering emulsion polymerization. The results showed that most PEDOT nanoparticles adhered to the PSt core particles having the size from 100 to 250 nm. By casting the latex, the obtained PEDOT-PSt film had a surface resistance of 4–5 kΩ/□, almost the same as the pure PEDOT film, though its PEDOT content was only 6.2 wt%. Those PEDOT nanoparticles in the outer layer could contact with one another, forming a continuous network as the conductive passageway. Furthermore, soft latex particles of poly(styrene-co-butyl acrylate), P(St-BA), were synthesized and mixed with the conducting rigid PEDOT-PSt latex for improving the toughness and transparency of the casting film. A critical point at about 2 wt% of PEDOT content in the PEDOT-PSt/P(St-BA) film was observed in the surface resistance measurement.     

Self-supported semi-interpenetrating polymer networks for new design of electrochromic devices

This paper reports the preparation of conducting films combining linear poly(3,4-ethylenedioxythiophene) (PEDOT) and cross-linked polyethylene oxide (PEO) into semi-interpenetrating networks. Due to the synthetic pathway, PEDOT is distributed within the PEO matrix and specifically along the two outer faces of the film. Such a distribution of the conducting polymer inside the matrix leads to the design of a self-supported and symmetrical PEDOT-Polymer electrolyte-PEDOT electrochromic device which can substitute the usual multilayer configuration. Optical contrast ΔT_630 nm (%) up to 33% is reached without contrast loss after 1500 switches. The switching time is 30 s for bleaching with a good memory effect (less than 1% decrease of transmittance after 1 h) of the device.     

Conducting hydrogels with enhanced mechanical strength

Mechanically strong triple-network (TN) hydrogels composed of poly(acrylic acid) (PAA) and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) have been fabricated with conductive PEDOT-PSS hydrogel acting as the third network. As-prepared PAA/PEDOT-PSS TN hydrogels display a compressive fracture stress as high as 1.8 MPa and still keep the electrical functionality of the conducting component. The success of PEDOT-PSS hydrogel in strengthening the materials is ascribed to the entangled microstructure of the triple networks and the variable molecular structure of the conducting polymer. A preliminary strengthening mechanism is proposed based upon the experimental results and the DN and/or TN theories. In addition, the applicability of the TN hydrogels in electrosensors and supercapacitors is briefly discussed. The present findings have successfully demonstrated the functionalization of mechanically strong hydrogels, and are of crucial significance in the development of DN and TN hydrogels both academically and practically.     

The effect of silane interlayer for high efficiency and long lifetime in polymer light emitting diodes

The effect of silane interlayer between poly(3,4-ethylenedioxythiophene:poly(styrenesulfonate) (PEDOT) and light emitting layer (EML) on the efficiency and lifetime of polyfluorene-based polymer light emitting diodes was investigated. γ-Methacryloxypropyl trimethoxysilane (MPS) was used as an interlayer and the efficiency of the device was enhanced by MPS. In addition, the lifetime of polymer device was also improved significantly by introducing a silane interlayer between PEDOT and EML.