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水溶液电化学法制得的聚噻吩的表征 总被引:1,自引:0,他引:1
以剖层X光电子能谱(XPS)及红外光指(FTIR)为主要手段对高氯酸水溶液中电化学聚合的聚噻吩进行表征,表明有羰基及键合氯存在,并讨论了聚合过程。 相似文献
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导电聚合物是由一些具有共轭π键的聚合物经化学或电化学掺杂后形成的导电率可从绝缘体延伸到导体范围的一类高分子材料。其中噻吩及其衍生物具有导电率高、环境稳定性好、成膜性好、禁带宽度小等特点,是用做光伏电池的理想材料。相继报道的有聚3-甲噻吩[1]、聚3-己基噻吩[2],聚(3-十一烷基-2,2’-并噻吩)[3]等。对于聚噻吩的光电化学性质的研究,在国际上很少见报道,国内尚未见报道,本文对聚噻吩(PTh)的光电化学性质进行了研究。1实验部分1.1仪器与试剂光电化学实验采用带石英窗口的三电极电解池,工作电极为ITO/PTh膜电极,参比电极为饱和… 相似文献
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利用光电化学方法研究了聚3-甲基噻吩的光电化学性质.其禁带宽度为1.93 eV.同时确定了它的价带、导带位置.研究还发现聚3-甲基噻吩属于直接跃迁半导体,具有很好的光电流稳定性.得到的最高IPCE值近1.0%. 相似文献
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以1-丁基-3-甲基咪唑六氟磷酸盐离子液体[BMIM]PF6既作为溶剂又作为支持电介质, 通过恒电流、循环伏安等方法制备聚(3-溴噻吩)(PBrT)膜. 采用红外光谱(FT-IR)和扫描电子显微镜(SEM)对PBrT膜的结构和形貌进行表征, 用热重和差热分析法(TG-DTA)研究聚合膜的热稳定性, 并利用紫外-可见光谱(UV-Vis)、计时电流和计时吸收曲线研究该聚合膜电化学和电致变色的特性. 研究结果表明, 与传统方法比较, 在离子液体[BMIM]PF6中制备的PBrT膜更致密、光滑, 具有良好的氧化还原可逆性和充放电能力, 电活性高, 热稳定性好. 以该方法制备的PBrT膜颜色变化明显, 响应时间快(0.5 s), 同时由于离子液体具有电位窗宽、导电率高、可循环利用等优点, 因此在电化学聚合等方面具有良好的应用前景. 相似文献
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热处理对聚噻吩结构性质的影响 总被引:1,自引:0,他引:1
用WAXS、FTIR、TGA方法研究了在氮气和空气中热处理聚噻吩(PT)某些结构性质.氯仿不溶分子量较高样品(PT_2)热稳定性高于氯仿可溶低分子量样品(PT_1).PT_2在氮气中380℃热处理30分钟,结晶度和相干长度都明显增加,可获得多于11个结晶衍射线.PT_1只能在较低温度下热处理,晶性无明显改善.结晶度低分子量大的样品,有利于掺杂进行.掺杂后得到较高的导电率.给出了热处理及掺杂前后的FTIR谱的解释与归属,热处理后688、831-833cm~(-1)明显减弱;经掺杂后出现了五个新吸收带:1016-1024、1105-1110、1196-1201、1323和1632cm~(-1). 相似文献
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合成了兼具离子电导性和电致变色性能的聚合物固体电解质(PVSEO_(21))。以其为基材的固态ECD具有双面显示功能,驱动电压>1.5V,着色和消色响应时间0.6和1.1秒(+2.0~—2.0V),开路记忆半衰期约5小时,着色后的最大吸收波长549nm,能可逆地显示蓝紫色和淡黄色。 相似文献
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Xiao-bo Wan Yun Lu Xiao-rong Liu Liang Zhou Shi Jin Gi Xue Department of Polymer Science Engineering the State Key Laboratory of Coordination Chemistry Nanjing University Nanjing China 《高分子科学》1999,(2):99-111
The complexation of thiophene with a Lewis acid with moderate acidity as a solvent, such as BF_3-ethyl ether (BFEE) remarkedly lowered the electrochemical polymerization potential. The positively chargedmetal surface of electrode in the process of electrochemical deposition enhanced the coordination interactionbetween π-electrons of thiophene unit and the metal, which makes thiophene rings lie parallel to the surfaceof electrode, resulting in a highly ordered polymeric structure. Because of the large intra-chain transferintegrals, the transport of charge is believed to be principally along the conjugated chains, which is muchgreater than the inter-chain hopping. The specific electrical resistance across the polythiophene film thicknessis more than 10~4 times than that along the surface plane of the film. In this paper we review the recentdevelopment of polymerization technique by low potential electrochemical method performed in our lab andseveral electrical devices in which the compact polythiophene films, such as anionic and cationic sieves, andlaminate film junction of undoped polythiophene derivatives were used. 相似文献
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本文用LCAO-CO/EHMO方法对噻吩高聚物的类苯结构(Ⅰ)、类等键长结构(Ⅱ)以及类酸结构(Ⅲ)的电子能带、态密度及电荷分布进行了计算。通过对计算结果的分析, 探讨了噻吩高聚物导电机理的有关问题。 相似文献
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Abstract— The excitation with a short flash of cells of a blue-green alga, Synechococcus sp., induced, besides photooxidation of cytochrome c -553 and P-700, small absorption changes of complex kinetics in the wavelength region between 450 and 570 nm. The absorption changes were resolved into two kinetic components different in their sensitivity to gramicidin D.
The ionophore-sensitive component (Gs), which rose very rapidly on flash illumination and decayed with a half-time of 3 ms, has spectral features indicating a red shift of carotenoid absorption bands. Gs was sensitive to valonomycin but not to 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU). The relaxation rate of Gs was markedly slowed down in the presence of tri- n -butyltin chloride. Phenazine methosulfate induced a secondary slow rise following the initial rapid rise. A similar slow rise appeared in the dark-starved cells but disappeared on the addition of methyl viologen. It is concluded from these results that Gs is an electrochromic band shift of carotenoid responding to the electric field formed by the primary charge separation of the photosystem I reaction center and its decay is related to the proton translocation through a proton channel of the membrane.
The ionophore-resistant component rose and decayed with the half-times of 0.2 and 2 ms, respectively. Its difference spectrum suggests a blue band shift of carotenoid. The ionophore-resistant component was also insensitive to DCMU. However, this component may be related in some way to flash-induced electron flow, because the photoresponse was altered by dibromothymoquinone, bathophenanthroline and 2- n -heptyl-hydroxyquinoline- N -oxide or the dark starvation of cells, which were all effective in inhibiting the cytochrome c -553 reduction. 相似文献
The ionophore-sensitive component (Gs), which rose very rapidly on flash illumination and decayed with a half-time of 3 ms, has spectral features indicating a red shift of carotenoid absorption bands. Gs was sensitive to valonomycin but not to 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU). The relaxation rate of Gs was markedly slowed down in the presence of tri- n -butyltin chloride. Phenazine methosulfate induced a secondary slow rise following the initial rapid rise. A similar slow rise appeared in the dark-starved cells but disappeared on the addition of methyl viologen. It is concluded from these results that Gs is an electrochromic band shift of carotenoid responding to the electric field formed by the primary charge separation of the photosystem I reaction center and its decay is related to the proton translocation through a proton channel of the membrane.
The ionophore-resistant component rose and decayed with the half-times of 0.2 and 2 ms, respectively. Its difference spectrum suggests a blue band shift of carotenoid. The ionophore-resistant component was also insensitive to DCMU. However, this component may be related in some way to flash-induced electron flow, because the photoresponse was altered by dibromothymoquinone, bathophenanthroline and 2- n -heptyl-hydroxyquinoline- N -oxide or the dark starvation of cells, which were all effective in inhibiting the cytochrome c -553 reduction. 相似文献
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基于聚苯胺电致变色高聚物、采用反射型电致变色器件结构模型,以柔性导电织物作为电极,构建了可控变色织物,可在-1.0~+1.0 V低电压范围内实现颜色变化显著的黄色和绿色的可逆响应.系统研究了变色织物在不同电压、不同弛豫时间及不同颜色工作电极下的L*a*b*,ΔE*值及反射率曲线,且讨论了透射型电致变色器件和电致变色织物的区别.随着正电压的增加,变色织物对应的a*b*依次减小,蓝绿色加深;随着负电压的增加,变色织物对应的a*b*依次增加,变色织物黄色加深.撤去电压后变色织物发生放电弛豫,慢慢回复到未加电压时的本征态.工作电极底色对电致变色织物也有显著的影响.变色织物的断电放电弛豫时间低于透射型电致变色器件. 相似文献