Systematic comparison of conventional and reductive single-walled carbon nanotube purifications
Systematic comparison of conventional and reductive single-walled carbon nanotube purifications
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DOI：
10.1016/j.carbon.2016.07.034
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发表时间：
2016-11-01
期刊：
影响因子：
10.9
通讯作者：
Shaffer, Milo S. P.
中科院分区：
文献类型：
--
作者：
Clancy, Adam J.;White, Edward R.;Shaffer, Milo S. P.
合成的单壁碳纳米管（SWCNT）通常被无定形碳和残留的催化剂颗粒污染。这些污染物对有效的机械和电子性能具有不利影响，限制了它们在许多应用中的性能。已经使用单一商业SWCNT类型（Tuball（TM））进行了一系列比较性的SWCNT纯化，包括酸处理、气相纯化和最近开发的还原纯化。选择每种纯化程序的潜在可扩展性以批量生产，并评价杂质去除程度、SWCNT损伤和总产率。拉曼光谱证实，使用萘钠的还原纯化得到最低的D/G比，表明sp（2）碳骨架被最有效地保留，同时去除了大部分（类似于74%）的金属杂质。相反，硝酸处理在去除几乎所有的金属杂质方面是最有效的，但是sp（2）碳框架在该过程中受到最严重的破坏。可扩展的，一锅，还原性分离的发展提供了一个有用的新方法，单壁碳纳米管纯化。(C)2016年6月，作者。爱思唯尔有限公司出版
As-synthesised single-walled carbon nanotubes (SWCNTs) are often contaminated with amorphous carbon and residual catalyst particles. These contaminants have a detrimental effect on the effective mechanical and electronic properties, limiting their performance in many applications. A comparative series of SWCNT purifications including acid treatments, gas phase purifications and recently-developed reductive purifications have been conducted using a single commercial SWCNT type (Tuball (TM)). Each of the purification procedures was selected for its potential scalability to bulk quantities and evaluated for the extent of impurity removal, SWCNT damage, and overall yield. Raman spectra confirmed that reductive purification using sodium naphthalide gave the lowest D/G ratio, suggesting that the sp(2) carbon framework was most effectively preserved, whilst removing a large proportion (similar to 74%) of the metal impurities. Conversely, nitric acid treatment was most effective at removing virtually all the metal impurities, but the sp(2) carbon framework was most heavily damaged in the process. The development of scalable, one pot, reductive separations provides a useful new approach to SWCNT purification. (C) 2016 The Authors. Published by Elsevier Ltd.