Creating fluorescent quantum defects in carbon nanotubes using hypochlorite and light
Creating fluorescent quantum defects in carbon nanotubes using hypochlorite and light
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DOI：
10.1038/s41467-019-10917-3
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发表时间：
2019-06-28
影响因子：
16.6
通讯作者：
Belcher, Angela M.
中科院分区：
文献类型：
--
作者：
Lin, Ching-Wei;Bachilo, Sergei M.;Belcher, Angela M.
单壁碳纳米管（SWCNTs）的共价掺杂可以改变其光学性质，使其成为单光子发射器和生物成像剂。我们在此报告了一种简单、快速、可控的方法来制备具有理想发射光谱的氧掺杂SWCNTs。在室温下用NaClO（漂白剂）处理水纳米管分散体，然后紫外照射不到1分钟，以获得最佳的o掺杂。掺杂效率受表面活性剂浓度和类型、NaClO浓度、辐照剂量等因素的影响。光化学作用谱表明掺杂涉及到碳纳米管侧壁与氯离子光解形成的氧原子的反应。产品的方差光谱显示，在优化处理的样品中，大多数单个纳米管显示出原始和掺杂的发射。描述了一种连续流动反应器，可以有效地制备毫克量的o掺杂SWCNTs。最后，我们演示了一种生物成像应用程序，该应用程序仅注射了类似于100 ng的掺杂纳米管，即可获得小鼠血管和淋巴结构的高对比度短波长红外荧光图像。
Covalent doping of single-walled carbon nanotubes (SWCNTs) can modify their optical properties, enabling applications as single-photon emitters and bio-imaging agents. We report here a simple, quick, and controllable method for preparing oxygen-doped SWCNTs with desirable emission spectra. Aqueous nanotube dispersions are treated at room temperature with NaClO (bleach) and then UV-irradiated for less than one minute to achieve optimized O-doping. The doping efficiency is controlled by varying surfactant concentration and type, NaClO concentration, and irradiation dose. Photochemical action spectra indicate that doping involves reaction of SWCNT sidewalls with oxygen atoms formed by photolysis of ClO- ions. Variance spectroscopy of products reveals that most individual nanotubes in optimally treated samples show both pristine and doped emission. A continuous flow reactor is described that allows efficient preparation of milligram quantities of O-doped SWCNTs. Finally, we demonstrate a bio-imaging application that gives high contrast short-wavelength infrared fluorescence images of vasculature and lymphatic structures in mice injected with only similar to 100 ng of the doped nanotubes.