Oxygen Doping Modifies Near-Infrared Band Gaps in Fluorescent Single-Walled Carbon Nanotubes
Oxygen Doping Modifies Near-Infrared Band Gaps in Fluorescent Single-Walled Carbon Nanotubes
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DOI：
10.1126/science.1196382
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发表时间：
2010-12-17
期刊：
影响因子：
56.9
通讯作者：
Weisman, R. Bruce
中科院分区：
文献类型：
--
作者：
Ghosh, Saunab;Bachilo, Sergei M.;Weisman, R. Bruce
单壁碳纳米管（SWCNT）的可控化学改性，调整其有用的性能已经被寻求用于多种应用。我们发现，在单壁碳纳米管中的有益的光学变化导致引入低浓度的氧原子。稳定的共价氧掺杂的纳米管制备暴露于臭氧，然后光。处理过的样品显示出独特的，结构特异性的近红外荧光波长10至15%，比原始的半导体单壁碳纳米管显示。掺杂位点通过捕获移动的激子来收集在未掺杂的纳米管区域中吸收的光能。氧掺杂的单壁碳纳米管比原始的单壁碳纳米管更容易检测和成像，因为它们产生更强的近红外发射，并且在偏移的发射波长处不吸收。
Controlled chemical modifications of single-walled carbon nanotubes (SWCNTs) that tune their useful properties have been sought for multiple applications. We found that beneficial optical changes in SWCNTs resulted from introducing low concentrations of oxygen atoms. Stable covalently oxygen-doped nanotubes were prepared by exposure to ozone and then light. Treated samples showed distinct, structure-specific near-infrared fluorescence at wavelengths 10 to 15% longer than displayed by pristine semiconducting SWCNTs. Dopant sites harvest light energy absorbed in undoped nanotube regions by trapping mobile excitons. The oxygen-doped SWCNTs are much easier to detect and image than pristine SWCNTs because they give stronger near-infrared emission and do not absorb at the shifted emission wavelength.