Ultrafast dynamics of single-walled carbon nanotubes dispersed in polymer films.
Ultrafast dynamics of single-walled carbon nanotubes dispersed in polymer films.
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分散在聚合物薄膜中的单壁碳纳米管的超快动力学。
DOI：
10.1021/jp044636e
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
J. M. Papanikolas
中科院分区：
文献类型：
--
作者：
D. Styers;S. Ellison;Cheol Park;K. Wise;J. M. Papanikolas
利用波长分辨的飞秒暂态吸收光谱研究了聚合物中单壁碳纳米管在可见光激发下的电子动力学行为。电子-空穴(e-h)对在瞬变光谱中产生了尖锐的特征，这种特征在幅度上衰减，并表现出快速的光谱位移。衰变反映了短(1.3ps)和长(35ps)时间尺度上的(e-h)复合。瞬变光谱还显示了早期广泛的光漂白现象，这是由于在pi等离子激元带的红边激发产生的热电子气体冷却而产生的。
Wavelength-resolved femtosecond transient absorption spectroscopy is used to follow the electronic dynamics of single-walled carbon nanotubes in polymers following visible photoexcitation. Electron-hole (e-h) pairs give rise to sharp features in the transient spectra that decay in amplitude and exhibit rapid spectral shifts. The decay reflects (e-h) recombination on both short (1.3 ps) and long (35 ps) time scales. Transient spectra also exhibit a broad photobleach at early times that arises from the cooling of a hot electron gas created via excitation at the red edge of a pi-plasmon band.