Photoluminescence imaging of suspended single-walled carbon nanotubes

被引：174

作者：

Lefebvre, Jacques ^{[1
]}

Austing, David G.

Bond, Jeffery

Finnie, Paul

机构：

[1] Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada

[2] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada

来源：

NANO LETTERS | 2006年 / 6卷 / 08期

关键词：

D O I：

10.1021/nl060530e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Single-walled carbon nanotubes (SWNTs) suspended in air over trenches are imaged using their intrinsic near-infrared (NIR) photoluminescence (1.0 - 1.6 mu m). Far-field emission from extended suspended lengths (similar to 50 mu m) is both spatially and spectrally resolved, and SWNTs are classified based on the spatial uniformity of their emission intensity and emission wavelength. In a few cases, emission assigned to different (n, m) species is observed along the same suspended segment. Most SWNTs imaged on millisecond time scales show steady emission, but a few fluctuate and suffer a reduction of intensity. The quantum efficiency is dramatically higher than that in previous reports and is estimated at 7%, a value that is precise but subject to corrections because of assumptions about absorption and coherence.

引用

页码：1603 / 1608

页数：6

共 28 条

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