Temperature effects on femtosecond transient absorption kinetics of semiconducting single-walled carbon nanotubes.
Temperature effects on femtosecond transient absorption kinetics of semiconducting single-walled carbon nanotubes.
复制标题
温度对半导体单壁碳纳米管飞秒瞬态吸收动力学的影响。
DOI：
10.1039/b612207h
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
G. Fleming
中科院分区：
文献类型：
--
作者：
Ying;L. Valkunas;S. Bachilo;G. Fleming
我们报告飞秒瞬态吸收动力学测量选定的半导体单壁碳纳米管在不同温度之间的77和290 K。纳米管被嵌入在一个薄的聚甲基丙烯酸甲酯膜，和个别物种的优势，使探测选择性的动力学与两个所需的管类型，（6，5）和（7，5）管。一个惊人的相似的温度依赖性之间的瞬态吸收动力学的振幅的最大变化，整体衰减时间和稳态荧光发射强度。对我们的数据的最简单的解释是，荧光强度和激子衰减动力学的温度依赖性主要由非辐射衰减和辐射衰减率是弱的温度依赖性。
We report femtosecond transient absorption kinetics measured for selected semiconducting single-walled carbon nanotubes at different temperatures between 77 and 290 K. The nanotubes are embedded in a thin polymethylmethacrylate film, and the dominance of individual species enabled to probe selectively the kinetics associated with two desired tube types, the (6,5) and (7,5) tubes. A strikingly similar temperature dependence is found between the maximum change in the amplitude of transient absorption kinetics, the overall decay time and steady-state fluorescence emission intensity. The simplest explanation for our data is that the temperature dependence of the fluorescence intensity and the exciton decay kinetics are dominated by nonradiative decay and that the radiative decay rate is weakly temperature dependent.