Synthesis and Bio-activities of Poly(3,4-ethylenedioxythiophene)(PEDOT)/Poly(styrene sulfonate)(PSS)/Gelatin Layer on Indium Tin Oxide(ITO)-coated Glass

Poly(3, 4-ethylenedioxythiophene)(PEDOT), together with its dopes, such as poly(styrene sulfonate)(PSS), has been acknowledged to have a wide range of biomedical applications as an important conducting polymer. In this study, gelatin can be polymerized into PEDOT/PSS polymers on indium tin oxide(ITO)-coated glass. PEDOT/PSS/gelatin layer on ITO-coated glass significantly decreases electrochemical impedance spectroscopy(EIS) and increases charge delivery capacity relative to the gelatin layer and bare ITOcoated glass, comparable to the PEDOT/PSS layer on ITO-coated glass. PEDOT/PSS/gelatin layer on ITOcoated glass enhances pheochromocytoma(PC 12) cell affinity, possesses a high biocompatibility and promotes PC 12 cell growth by delivery of electrical stimulation. These results suggest that gelatin can be incorporated into the PEDOT/PSS polymers through electrochemical polymerization and the PEDOT/PSS/gelatin layer on ITO-coated glass possesses high electrochemical and biological activities.     

不同电导率的PEDOT对聚合物光电池性能的影响

采用几种具有不同电导率的PEDOT(poly(3,4-ethylene dioxythiophene)),研究其对器件性能的影响,结果表明高电导率的PEDOT与ITO(Indium tin oxide)一起作为光电池的阳极,有利于光电池能量转换效率的提高.探讨了高电导率PEDOT的厚度与器件性能之间的相关性,表明在保证器件不漏电的前提下PEDOT的厚度越薄越好.     

UV irradiation induced conductivity improvement in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) film

We describe a simple method to increase the conductivity of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)film by exposure to ultraviolet(UV)light in vacuum.Up to four order of conductivity improvement(from 10 3to 50 S/cm)is achieved by irradiating PEDOT:PSS film with 254 nm ultraviolet(UV)light.Increased conductivity in UV treated PEDOT:PSS film is stable under ambient exposure.The mechanism for conductivity improvement is investigated by current-voltage measurement,atomic force microscopy,and absorption spectrum.Photo-cross-linking of PSS chains is determined as the reason for conductivity improvement.Our result demonstrates that UV treatment is capable of modifying the conductivity of PEDOT:PSS film independent of the process of film formation.     

Gas sensitivity of poly (3, 4-ethylene dioxythiophene) prepared by a modified LB film method

An arachidic acid/poly (3, 4-ethylene dioxythiophene) (AA/PEDOT) multilayer Langmuir-Blodgett (LB) film was prepared by a modified LB film method. The theories were utilized to explain the effects between HCl molecule and LB film. The gas sensitivity mechanism of poly (3, 4-ethylene dioxythiophene) (PEDOT) multilayer film can be explained by the charge transfer between p system of PEDOT and oxidization HCl system. The gas sensitivity of PEDOT LB film deposited interdigital electrode to HCl was tested. The results showed that film thickness, treating temperature, deposition speed had different influence on film gas sensitivity. The AA/PEDOT film deposited device exhibited nonlinear behavior to HCl gas at lower concentration (20-60 ppm) and linear response behavior at higher gas concentration was observed. The time of the compound LB film of the AA/PEDOT responding to the 30 ppm HCl gas is about 20 seconds, which is far quicker than the time of the film to the PEDOTPRESS film(about 80 seconds). It is not higher film press to better film. When the film press attains 45 mNs/m, the sensitivity of the AA/PEDOT film on the contrary descends.     

聚乙撑二氧噻吩/多壁碳纳米管复合材料的制备与电化学性能研究

以三氯化铁为氧化剂,通过原位聚合法制备聚乙撑二氧噻吩/多壁碳纳米管复合材料.热重分析结果表明：聚乙撑二氧噻吩/多壁碳纳米管复合材料相对于聚乙撑二氧噻吩具有更好的热稳定性;采用傅里叶变换红外光谱（FT-IR）、扫描电镜（SEM）对产物的结构与形貌进行表征,聚乙撑二氧噻吩在多壁碳纳米管表面形成了均匀的包覆层,两者之间存在一定的界面作用.在1 mol/L氯化钾（KCl）溶液中,采用循环伏安测试法（CV）研究样品的电化学性能,聚乙撑二氧噻吩/多壁碳纳米管复合材料的比电容可达139.8 F/g.     

聚（3，4-乙撑二氧噻吩）:聚苯乙烯磺酸阳极缓冲材料的改性研究

聚（3,4-乙撑二氧噻吩）:聚苯乙烯磺酸（PEDOT:PSS）是导电聚合物领域的明星分子,具备可见光透过率高、易低温溶液加工且廉价等优点,常作为标准阳极缓冲材料（ABM）广泛应用于叠层有机光电器件领域中。然而,随着半导体材料和器件结构的飞速发展,对ABM提出了更高要求,当前PEDOT:PSS的性质参数无法很好满足新一代有机光电器件的需要（如电导率较低、功函数较小、酸性较强和亲水性较强等）,成为制约有机光电器件性能提升的重要瓶颈。改变导电聚合物的结构可有效优化其性质参数、大幅提升有机光电器件性能,备受关注。本文首先详细阐述PEDOT:PSS的结构特征（包括溶液和固体两种状态的结构特征）,揭示PEDOT:PSS的结构与性质的关系,然后综述外加剂和新型掺杂剂（PSS替代物）改变PEDOT导电聚合物结构和性质的改性研究进展,最后展望PEDOT:PSS ABM领域的改性研究发展趋势。     

Structures and properties of PEDOT nanotubes prepared by a template synthesis method

PEDOT nanotubes were prepared by a template synthesis method. Based on our template, it was deduced that there are two successive processes in the formation of nanotubes. The first step is soakage of the porous templates by a polymer solution, and the second step is adsorption of free charged cationic groups and doped PEDOT onto the template surface with negative charges. XRD results showed that well orientated PEDOT chains were formed during the synthesis, moreover the arrange conductivity of molecular chains strongly affect the structures of PEDOT nanotubes. The nanotubes were measured to be about 5.5–17.6 S/cm, which is higher than that of nanotube pellet due to the high contact resistance between the adjacent nanotubes. Funded National Natural Science Foundation of China(No.: 60372002)     

碳纳米管导电增强聚乙撑二氧噻吩复合材料的研究

采用原位聚合法以三氯化铁作为掺杂剂,过硫酸铵为氧化剂和引发剂制备碳纳米管/聚乙撑二氧噻吩复合材料.通过扫描电镜（SEM）、透射电镜（TEM）、红外光谱（IR）对样品形貌及结构进行表征,采用循环伏安测试法（CV）研究碳纳米管/聚乙撑二氧噻吩纳米复合材料的电化学行为.结果表明：聚乙撑二氧噻吩纳米颗粒均匀包覆于多壁碳纳米管的表面,形成核壳结构;随碳纳米管含量的增加,复合材料的电化学性能随之改善,当碳纳米管质量分数为28.6％时,碳纳米管/聚乙撑二氧噻吩纳米复合材料的比电容达到179.8 F/g,且电化学活性最好.     

多孔模板法制备PEDOT气体敏感性的研究

采用单体聚合－溶液浸润－聚合物成管同时进行的方法在氧化铝多孔模板(AAO)中制备了PEDOT纳米管。气体敏感性测试发现纳米管对多种挥发性有机气体有不同的敏感性能,尤其对挥发性醇类,如甲醇、乙醇表现出比普通块材好得多的敏感性。测试结果表明PEDOT纳米管对1 000 ppm甲醇气体的响应时间约为10～20 s,测试可重复性超过15次,说明PEDOT纳米管不仅提供了较大表面积供气体分子吸附,而且管中分子链取向一致,从而体现出较好的敏感性能。     

电化学处理对Π共轭聚合物阳极特性的改善

研究了电化学对聚合物发光二极管空穴注入和传输层(PEDOT薄膜，polyethylene dioxythiophene)的掺杂处理，由这种薄膜与ITO(indium-tin oxide)构成的双层阳极明显地改善了器件性能，当以MEHPPV(poly(2’-methoxy．5(2’-ethyl-hexyloxy)-1，4-phenylene vinylene))为发光聚合物时，器件的工作电压得到了降低；当以PFO(poly(2，7-dibmmo-9，9-dioetylfluorene))作为发光聚合物时器件的最大外量子效率提高到0．6％．     

Platinum wire implants coated with PEDOT/carbon nanotube conducting polymer films in the brain of rats: A histological evaluation

Platinum (Pt) implants coated with poly (3, 4-ethylenedioxythiophene)/carbon nanotube (PEDOT/CNT) composite films were implanted into the brain of rats, and the brain response was evaluated 6 weeks after the implantation. The surface morphology of Pt implants with and without the PEDOT/CNT coating was studied using scanning electron microscopy (SEM). After 6 weeks post-implantation, the expression of laminin (vascular endothelial marker) and neuronal nuclei (NeuN, neuronal marker) were evaluated by immnohistochemistry. It is revealed that the obvious improvements of the surface density of blood vessels and neurons aound the Pt implants with the coating, which were evidenced by laminin and NeuN staining in the zone within the distance of 150 μm to the implant interface. These results suggest the PEDOT/CNT composite films can improve the biocompatibility of the Pt electrodes while it is implanted in brain.     

大面积电致变色器件的制备及性能研究

采用溶胶-凝胶法合成了TiO2-CeO2薄膜,XRD、SEM、紫外可见透射光谱、循环伏安法等测试结果表明：经500℃热处理1h后的TiO2-CeO2薄膜呈面心立方方铈矿结构,其薄膜表面光滑,光学透过率高于80％,电荷存储量可达9．46mC·cm^-2,循环可逆性K为95％,是一种性能优良的电荷储存材料．同时采用聚（3,4-乙撑二氧噻吩）PEDOT／PSS为电致变色活性材料,制备了对称结构（ITO｜｜PEDOT／PSS｜｜PMMA／PC—LiClO4｜｜PEDOT／PSS｜｜ITO）和非对称结构（ITO｜｜PEDOT／PSS｜｜PMMA／PC—LiClO4｜｜TiO2-CeO2｜｜ITO）的大面积（10cm×10cm）电致变色器件,发现二者的对比度分别为17％、23．4％,褪色响应时间则分别为0．9s和2．8s,具有良好的应用性能．     

复合乳化剂浓度对PANI／PEDOT复合阳极材料导电性及结构的影响

以原位聚合法制备了导电聚合物聚苯胺／聚3,4-乙烯二氧噻吩（PANI／PEDOT）复合阳极材料．研究了复合乳化剂浓度对PANI／PEDOT复合阳极材料的电化学性能和结构的影响．用线性扫描、交流阻抗、傅里叶变换红外光谱和x-射线衍射对所得的复合阳极材料的电化学特性、物相和结构进行了表征．结果表明,当复合乳化剂浓度为0．2mol／L时,PANI／PEDOT复合阳极材料具有较好的导电性,所得复合材料的分子链有序性较好,结构规整,结晶性好．     

Dissipative Particle Dynamics Simulation on Bonding Reaction Between Surface Modified Nanoparticles

A simulation study was carried out by using dissipative particle dynamics(DPD) method to explore the effects of properties of coating chains, such as length, density, rigidity of polymer chains, as well as the distance between nanoparticles on bonding reaction of coating chains grafted onto nanoparticles. The results show that bonding ratios of coated chains strongly depend on the length and density of coating chains. For nanoparticles with different coating densities, the optimum chain length for bonding reaction are varied. The rigidity of coating chains exhibits vigorous effects on bonding reaction that highly depends on chain lengths. DPD simulation can be used to study the bonding reaction between coated nanoparticles, which may help experimental synthesis of nanocomposites with excellent properties.     

Ni纳米粒子掩膜用于提高GaN基LED出光率的研究

以无水乙醇为溶剂、柠檬酸为分散剂,用超声分散技术配制Ni纳米粒子分散液;将分散液用旋涂的方法在GaN基发光二极管(LED)的ITO电流扩展层上制备单层Ni纳米粒子掩膜,采用ICP(inductively coupledplasma)干法刻蚀技术在ITO层上制作出表面粗化的结构。在20 mA工作电流下,与普通GaN基LED相比,这种ITO表面粗化的GaN基LED芯片发光强度提高了30%,并且对器件的电性能影响很小。结果表明,该表面粗化技术是一种工艺简单、成本低和能有效提高LED发光效率的方法。     

环丁砜在染料敏化太阳能电池固体电解质中的应用

以CuSCN、环丁砜、1,2-二甲基-3-丙基咪唑碘、PEDOT:PSS为原料制备了染料敏化太阳能电池固体电解质,研究并探讨了环丁砜对电池光电性能的影响,同时对电池稳定性能进行了考察。结果表明,环丁砜引入染料敏化太阳能电池固体电解质中,电池的光电性能及稳定性能均得到了一定的改善;当环丁砜加入量为0.18g、CuSCN粉体为0.25g时,染料敏化太阳能电池短路电流密度为3.92mA/cm2,开路电压为0.42V,光电转换效率为0.86%,电池性能较稳定。     

Preparation of Ca_9Sr(PO_4)_6(OH)_2 Nanoparticles and Effects on Proliferation of Bel-7402 and L-02 Cells in vitro

1Introduction Hydroxyapatite(Ca10(PO4)6(OH)2,HAP)isthe maincomponentofinorganicmineralinanimalsclerous tissue.ArtificialHAPiswidelyusedassubstituteorfill ingmaterialforscleroustissuesbecauseofitsgoodbio compatibilityandosteoconductivity[1,2].Itisalsousedi…     

Effect of hydroxyapatite nanoparticles on K562 cells in vitro

Stable and single-dispersed hydroxyapatite （HAP） nanoparticles were synthesized with ultrasonic-assisted method. HAP nanoparticles were characterized by dynamic light scattering, XRD （X-ray diffraction） and TEM （Transmission Electron Microscopy）. The effect of HAP nanoparticles on the K562 human myelogenous leukemia cell line was investigated by MTT assay and cell count test, and the mechanism was studied through the changes of cell cycle and ultrastructure. The results showed that HAP nanoparticles inhibited the proliferation of K562 cells dramatically in vitro. HAP nanoparticles entered the cytoplasm of K562 cells and the cells were arrested at G/M phase, thus, the cells died directly.     

功能化Fe_3O_4对水中亚甲基蓝染料的吸附性能研究

通过共沉淀法制备了磁性Fe_3O_4纳米粒子,并将其表面包覆二氧化硅外壳,制备了性质稳定,脱色性能较好,同时易于固液分离的功能化磁性纳米粒子.以模拟印染废水的脱色为目标,研究了pH、温度、吸附时间等因素对脱色效果的影响.研究结果表明,磁性吸附剂制备成本低,对亚甲基蓝溶液的脱色效率显著.     

聚噻吩/壳聚糖层层自组装织物制备及性能研究

研究了以聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸和壳聚糖进行静电层层自组装整理,得到具有防紫外、导电功能的棉织物。采用聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸(PEDOT:PSS)和壳聚糖(CS)通过静电层层自组装技术对棉织物进行表面改性,并研究其导电、防紫外线性能。采用扫描电子显微镜(SEM)、傅里叶红外分析光谱(FTIR)及表面染色色深(K/S值)分析改性棉织物的表观形态结构;采用紫外线防护系数(UPF)评估防紫外线性能,采用两探针法测量织物表面导电性能并得到相应的IV曲线。研究表明:经石墨烯改性后的棉织物展现出超强的紫外线防护性,其导电性能也有相应的提高。组装5次,改性织物的UPF值达到92.39,远高于未处理棉织物(UPF=9.37)。另外,仅组装5次,改性棉织物的表面电阻率由未处理棉织物的7.19×10~7Ω·m降到4.4×10~2Ω·m。