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arXiv 1303.0986cond-mat.mtrl-scicond-mat.mes-hall
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单壁碳纳米管的电解质致亮机理

Mechanism of Electrolyte-Induced Brightening in Single-Wall Carbon Nanotubes

Juan G. Duque, Laura Oudjedi, Jared J. Crochet, Sergei Tretiak, Brahim Lounis, Stephen K. Doorn, Laurent Cognet

摘要:

虽然电解质添加到单壁碳纳米管的十二烷基硫酸钠悬浮液中已被证明会导致纳米管光致发光(PL)的显着增亮,增亮机制尚未得到解决。在这里,我们使用时间分辨PL衰减测量探测这种机制。我们发现,PL衰减时间增加了一个因素的2上添加氯化铯作为电解质。这样的增加直接平行于观察到的近一倍的PL强度,表明增亮的结果主要是从与激子扩散淬火网站的非辐射衰减率的变化。我们的研究结果表明,这些网站的数量减少的结果从电解质诱导的表面活性剂表面结构的重新取向,部分地除去口袋的水从管表面激子可以解离,从而强调了界面水的贡献激子复合过程。

英文摘要:

While addition of electrolyte to sodium dodecyl sulfate suspensions of single-wall carbon nanotubes has been demonstrated to result in significant brightening of the nanotube photoluminescence (PL), the brightening mechanism has remained unresolved. Here, we probe this mechanism using time-resolved PL decay measurements. We find that PL decay times increase by a factor of 2 on addition of CsCl as the electrolyte. Such an increase directly parallels an observed near-doubling of PL intensity, indicating the brightening results primarily from changes in nonradiative decay rates associated with exciton diffusion to quenching sites. Our findings indicate that a reduced number of these sites results from electrolyte-induced reorientation of the surfactant surface structure that partially removes pockets of water from the tube surface where excitons can dissociate, and thus underscores the contribution of interfacial water in exciton recombination processes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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