Simultaneous doping and crosslinking of polythiophene films
Simultaneous doping and crosslinking of polythiophene films
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DOI：
10.1039/c7py01688c
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发表时间：
2017-12
影响因子：
4.6
通讯作者：
P. Reinold;Kirsten Bruchlos;S. Ludwigs
中科院分区：
文献类型：
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作者：
P. Reinold;Kirsten Bruchlos;S. Ludwigs
我们提出了一种点击化学方法来合成基于高区域规则的具有可调节的侧链氧化还原活性三苯胺(TPA)基团的共轭氧化还原聚合物。溶液处理后，以F4TCNQ为受体，FeCl3为化学氧化剂，对均匀薄膜进行电化学掺杂和化学掺杂。我们发现，掺杂伴随着电化学触发剂上的交联或FeCl3的氧化，导致聚噻吩膜通过四苯基联苯胺(TPB)单元交联化。循环伏安结合原位吸收光谱和原位电导测量表明，主链和悬垂氧化还原单元的氧化和电导模式相似，使薄膜易于发生稳定的氧化还原转变。用四探针法测量了高达8 S cm−1的体电导，即可达到与区域掺杂规则聚(3-己基噻吩基)相当的值。交联反应使薄膜不溶于所有测试的溶剂，从而打开了材料与有机溶剂直接接触的潜在应用。
We present a click chemistry approach for the synthesis of conjugated redox polymers based on highly regioregular polythiophenes with tunable amounts of pendant redox-active triphenylamine (TPA) groups. After solution-processing doping of homogeneous films was performed electrochemically and chemically by the acceptor F4TCNQ and the chemical oxidant FeCl3. We find that doping is accompanied by crosslinking upon electrochemical triggers or by oxidation with FeCl3 leading to polythiophene films crosslinked via tetraphenylbenzidine (TPB) units. Cyclic voltammetry coupled with in situ absorption spectroscopy and in situ conductance measurements show similar oxidation and conductivity regimes for the backbone and the pendant redox units making the films prone to stable redox switching. Bulk conductivities as high as 8 S cm−1 are measured by four-point-probe, i.e. values comparable to doped regioregular poly(3-hexylthiophene) are reachable. The crosslinking reaction renders the films insoluble in all tested solvents, opening potential applications of the materials in direct contact with organic solvents.