Temasek Laboratories, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553.
ACS Appl Mater Interfaces. 2011 Mar;3(3):782-8. doi: 10.1021/am101133q. Epub 2011 Feb 21.
Hybrid electrochromic materials were readily synthesized via copolymerization of aniline with p-phenylenediamine-functionalized single-walled carbon nanotubes (SWCNTs) in the presence of poly(styrene sulfonate) (PSS) dopant in an aqueous medium. Polyaniline (PANI)-grafted SWCNTs are formed, and they are uniformly dispersed in the PANI/PSS matrix. Impedance analysis shows that the charge-transfer resistances of the hybrids at all states are reduced drastically with increasing SWCNT loading. With 0.8 wt % SWCNTs, the charge-transfer resistances of the hybrid at +1.5 and -1.5 V are only about 20% and 12% of those of PANI/PSS, respectively, which is due to the greatly increased redox reactivity given by the enhanced electron transport in the hybrid and further doping function of the SWCNTs. The remarkable increase in redox reactivity leads to much enhanced electrochromic contrast from 0.34 for PANI to 0.47 for PANI-SWCNT-0.8%.
通过在水溶液中聚合苯胺与对苯二胺功能化的单壁碳纳米管 (SWCNTs)，并加入聚(苯乙烯磺酸盐) (PSS)掺杂剂，可轻易地合成混合电致变色材料。形成接枝有聚苯胺 (PANI)的 SWCNTs，它们在 PANI/PSS 基质中均匀分散。阻抗分析表明，随着 SWCNT 负载量的增加，所有状态下的混合物的电荷转移电阻都急剧降低。在 0.8wt%SWCNTs 的情况下，在 +1.5 和 -1.5V 时，混合体的电荷转移电阻分别仅为 PANI/PSS 的约 20%和 12%，这是由于混合体中电子传输增强所带来的氧化还原反应性大大提高，以及 SWCNTs 的进一步掺杂作用。氧化还原反应性的显著提高导致电致变色对比度从 PANI 的 0.34 显著提高到 PANI-SWCNT-0.8%的 0.47。
