Pyrene-tetrathiafulvalene supramolecular assembly with different types of carbon nanotubes
作者:Christian Ehli、Dirk M. Guldi、M. Ángeles Herranz、Nazario Martín、Stéphane Campidelli、Maurizio Prato
DOI:10.1039/b716892f
日期:——
Pyrene-tetrathiafulvalenes reveal strong interactive forces with different types of carbon nanotube (CNT) samples—ranging from single-walled carbon nanotubes (SWNTs) to multi-walled carbon nanotubes (MWNTs). Notable, although subtle, are the differences that emerged while preparing, handling, and characterizing these composite materials. Stronger are the differences seen in the context of photoinduced charge transfer. In particular, charge injection into the conduction band of CNT probes afforded stable radical ion pair states (i.e., on the time scale of our femto/picosecond investigation) only for MWNTs, while the lifetimes for SWNTs are shorter. A likely rationale involves the multiple electron acceptor levels in MWNTs, when compared to SWNTs or double-walled carbon nanotubes (DWNTs).
吡啶四硫富瓦烯与不同类型的碳纳米管(CNT)样品(从单壁碳纳米管(SWNT)到多壁碳纳米管(MWNT))之间存在很强的相互作用力。值得注意的是,在制备、处理和表征这些复合材料时,虽然细微,但出现了明显的差异。在光诱导电荷转移的背景下,差异更加明显。特别是,电荷注入到CNT探针的导带中,仅对MWNTs提供了稳定的自由基离子对状态(即,在我们的飞秒/皮秒研究的时间尺度上),而SWNTs的寿命较短。一个可能的解释是,与SWNTs或双壁碳纳米管(DWNTs)相比,MWNTs具有多个电子受体水平。