Femtosecond transient absorption spectroscopy of single-walled carbon nanotubes in aqueous surfactant suspensions: determination of the lifetime of the lowest excited state.
Femtosecond transient absorption spectroscopy of single-walled carbon nanotubes in aqueous surfactant suspensions: determination of the lifetime of the lowest excited state.
复制标题
表面活性剂水悬浮液中单壁碳纳米管的飞秒瞬态吸收光谱：最低激发态寿命的测定。
DOI：
10.1039/b415524f
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. Unterreiner
中科院分区：
文献类型：
--
作者：
J. P. Yang;M. Kappes;H. Hippler;A. Unterreiner
单壁碳纳米管（SWNTs）在水表面活性剂悬浮液中的单壁碳纳米管（SWNTs）的飞秒单色和双色泵浦探测光谱已被用于评估最低激发态的“固有”寿命。我们证明，这种测量可能会受到几个相互竞争的光物理过程的干扰，从而使终身反褶积变得困难。此外，我们展示了这些主要由样本异质性引起的影响是如何减少的。对于平均直径为0.95 nm和1.2 nm的纳米管，在红外产率寿命附近的诱导瞬态测量分别为（35 +/- 10）ps和（56 +/- 10）ps。此外，还观察到ps到亚ps的快速衰减成分。我们暂时将其归因于SWNT束组件的松弛。
Femtosecond one- and two-colour pump-probe spectroscopy of single-walled carbon nanotubes (SWNTs) individual in aqueous surfactant suspensions has been used to assess the "intrinsic" lifetime of the lowest excited states. We demonstrate that such measurements can be perturbed by several competing photophysical processes thus making lifetime deconvolution difficult. Furthermore we show how these effects, arising primarily from sample heterogeneity, can be reduced. Measurements of induced transients in the near IR yield lifetimes of (35 +/- 10) ps and (56 +/- 10) ps, for nanotubes having mean diameters of 0.95 and 1.2 nm, respectively. Furthermore, a fast decay component in the ps to sub-ps regime is also observed. We tentatively attribute this to relaxation in SWNT bundle components.