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Synthesis, Properties and Applications of Oligothiophenes with Well-defined Structures and Novel Polymers Containing Pendant Oligothiophenes

结构明确的低聚噻吩及含低聚噻吩侧链的新型聚合物的合成、性能及应用

基本信息

批准号：
06453155
负责人：
SHIROTA Yasuhiko
金额：
$ 4.99万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

For the purpose of developing a new type of photo-and electro-active materials, we have investigated the synthesis of oligothiophenes with well-defined structures and novel polymers containing pendant oligothiophenes, and their electrical, photoelectrical and electrochromic properties.In order to elucidate the relationship between electrical conductivities and the length of pi-conjugation in oligothiophenes, we have investigated electrochemical doping of alpha-ethyl-disubstituted oligothiophenes, and electrical properties of resulting radical-cation salts. The electrochemically doped thiophene tetramer and pentamer were found to exhibit room-temperature conductivities of 10^<-7> and 10^<-3> S cm^<-1> with activation energies of 0.5 and 0.1 eV,respectively.In order to develop a new class of materials for photoelectric conversion, we have studied oligothiophenes for use in photovoltaic devices. The conversion efficiency of the ITO/perylene pigment (400A)/thiophene octamer (300A)/Au cell was ca. 0.6 % for the incident white light (10-200 mW cm^<-2>) through the ITO electrode. The present study shows that oligothiophenes constitute a new class of promising photoactive materials that function as p-type semiconductors for use in photovoltaic devices.We have investigated the synthesis and properties of novel polymers containing pendant oligothiophenes with well-defined structures, which are expected to have unique properties characteristic of both pendant oligothiophenes and non-conjugated polymer backbone. The electrical conductivity of electrochemically doped polymers was found to increase with the increase in the length of pendant oligothiophenes. The electrochemically doped polymers were found to undergo a reversible, clear color change The present study shows that electrochemically doped polymers containing pendant oligothiophenes with well-defined structures constitute a novel class of potential electrochromic materials.

为了开发新型光电活性材料，我们研究了具有明确结构的寡聚噻吩和含寡聚噻吩侧链的新型聚合物的合成及其电、光电和电致变色性能，并阐明了电导率与寡聚噻吩π共轭长度的关系，我们已经研究了α-乙基-二取代的低聚噻吩的电化学掺杂和所得自由基-阳离子盐的电性能。电化学掺杂的噻吩四聚体和五聚体的室温电导率分别为10^<-7>和10^<-3>S cm^，<-1>活化能分别为0.5和0.1 eV。为了开发一类新的光电转换材料，我们研究了用于光伏器件的寡聚噻吩。ITO/二萘嵌苯颜料（400 A）/噻吩八聚体（300 A）/Au电池的转换效率约为100%。0.6对于通过ITO电极的入射白色光（10-200 mW cm-2<-2>），目前的研究表明，低聚噻吩构成了一类新的有前途的光活性材料，功能作为p型半导体用于光伏器件。我们已经研究了新型聚合物的合成和性能包含侧链低聚噻吩具有明确的结构，这是预期具有独特的性能特性的侧链低聚噻吩和非共轭聚合物主链。电化学掺杂的聚合物的电导率被发现随着侧链低聚噻吩的长度的增加而增加。电化学掺杂的聚合物被发现经历可逆的，清晰的颜色变化。本研究表明，电化学掺杂的聚合物含有侧基低聚噻吩与明确的结构构成一类新的潜在的电致变色材料。