Department of Applied Physics, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan.
ACS Nano. 2011 Jul 26;5(7):5881-7. doi: 10.1021/nn201661q. Epub 2011 Jun 17.
We study exciton energy transfer in double-walled carbon nanotubes using femtosecond time-resolved luminescence measurements. From direct correspondence between decay of the innertube luminescence and the rise behavior in outertube luminescence, it is found that the time constant of exciton energy transfer from the inner to the outer semiconducting tubes is ∼150 fs. This ultrafast transfer indicates that the relative intensity of steady-state luminescence from the innertubes is ∼700 times weaker than that from single-walled carbon nanotubes.
我们使用飞秒时间分辨发光测量研究了双壁碳纳米管中的激子能量转移。从内管发光的衰减与外管发光的上升行为之间的直接对应关系发现，激子从内管到外管半导体的能量转移时间常数约为 150 fs。这种超快转移表明，稳态发光的相对强度内管比单壁碳纳米管弱约 700 倍。
