Nitric acid purification of single-walled carbon nanotubes
Nitric acid purification of single-walled carbon nanotubes
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DOI：
10.1021/jp035719i
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发表时间：
2003-12-18
影响因子：
3.3
通讯作者：
Haddon, RC
中科院分区：
文献类型：
--
作者：
Hu, H;Zhao, B;Haddon, RC
报道了通过使用热重分析（TGA）和近红外（NIR）光谱的组合，系统地评价了使用硝酸作为电弧产生的单壁碳纳米管（SWNT）的纯化处理。硝酸是用于纯化SWNT的标准试剂，并且传统上构成许多不同纯化方案中的第一步。已经提出，硝酸除去了在SWNT的生产中使用的过渡金属催化剂以及无定形碳。在所有条件下，我们发现硝酸破坏单壁碳纳米管产生无定形碳，同时减少样品中剩余的过渡金属催化剂的量。因此，硝酸适合于从单壁碳纳米管样品中除去催化剂，但仅以单壁碳纳米管的显著破坏为代价。
report a systematic evaluation of the use of refluxing nitric acid as a purification treatment for electric arc-produced single-walled carbon nanotubes (SWNTs), by using a combination of thermogravimetric analysis (TGA) and near-infrared (NIR) spectroscopy. Nitric acid is the standard reagent for purification of SWNTs and has traditionally constituted the first step in many different purification schemes. It has been suggested that nitric acid removes the transition metal catalyst that is used in the production of the SWNTs together with amorphous carbon. Under all conditions, we find that nitric acid destroys SWNTs to produce amorphous carbon while reducing the amount of transition metal catalyst remaining in the sample. Thus, nitric acid is suitable for removing the catalyst from SWNT samples, but only at the expense of a significant destruction of the SWNTs.