The development of a highly conductive PEDOT system by doping with partially crystalline sulfated cellulose and its electric conductivity
The development of a highly conductive PEDOT system by doping with partially crystalline sulfated cellulose and its electric conductivity
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DOI：
10.1039/c5tc02074c
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发表时间：
2015-01-01
影响因子：
6.4
通讯作者：
Ihara, Hirotaka
中科院分区：
文献类型：
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作者：
Horikawa, Maki;Fujiki, Takanori;Ihara, Hirotaka
采用纤维素直接磺化法制备了不同程度取代硫酸盐基的磺化纤维素（CS），并将其作为PEDOT的掺杂剂。以3,4-乙烯二氧噻吩（EDOT）为原料，采用原位化学氧化聚合法制备了PEDOT/CS。采用旋涂法制备了PEDOT/CS薄膜。作为参考，还形成了PEDOT/PSS薄膜。DS为1.03的PEDOT/CS薄膜的电导率为0.576 S m（-1）。PEDOT/PSS薄膜的电导率为0.0153 S cm（-1）。利用拉曼光谱，我们发现1400和1500 cm（-1）波段对应于五元PEDOT环中的c - α = c - β振动。与PEDOT/PSS膜的波段相比，PEDOT/CS膜的波段从1437 cm红移至1433 cm(-1)，并变窄。我们将PEDOT/CS薄膜电导率的提高归因于比PEDOT/PSS中含有的PEDOT更大比例的类醌结构。
Using direct sulfation of cellulose, we prepared sulfated cellulose (CS) with various degrees of substitution of sulfate groups (DS), which we used as dopants for PEDOT. PEDOT/CS were prepared via in situ chemical oxidative polymerization of 3,4-ethylenedioxythiophene (EDOT) in an aqueous CS solution. Films of the obtained PEDOT/CS were formed using spin-coating. As a reference, a PEDOT/PSS film was also formed. The electrical conductivity of the PEDOT/CS film with a DS of 1.03 was 0.576 S m(-1). In contrast, the electrical conductivity of the PEDOT/PSS film was 0.0153 S cm(-1). Using Raman spectroscopy, we found that the 1400 and 1500 cm(-1) bands correspond to the C-alpha=C-beta vibrations in the five-member PEDOT ring. Compared with the band of the PEDOT/PSS film, the band of the PEDOT/CS film red-shifted from 1437 to 1433 cm(-1) and narrowed. We attributed the increased electrical conductivity of the PEDOT/CS film to a greater proportion of the quinoid structure than in PEDOT contained in PEDOT/PSS.