A one-step route to solubilised, purified or functionalised single-walled carbon nanotubes.
A one-step route to solubilised, purified or functionalised single-walled carbon nanotubes.
复制标题
一步的途径，用于溶解，纯化或功能化的单壁碳纳米管。
DOI：
10.1039/c5ta03561a
复制
发表时间：
2015-08-28
期刊：
影响因子：
--
通讯作者：
Shaffer MS
中科院分区：
文献类型：
--
作者：
Clancy AJ;Melbourne J;Shaffer MS
使用N，N-二甲基甲酰胺作为用于碳纳米管还原和溶解的溶剂允许简单且有效的溶解和纯化。还原溶解是单壁碳纳米管（SWCNT）的一种有前途的加工路线，其避免了由超声波处理和侵蚀性氧化引起的损伤，同时允许进入大量的SWCNT官能化反应。在这里，还原溶解已被简化为一个单一的一锅反应，通过使用萘钠在二甲基乙酰胺允许直接合成SWCNT Na+溶液。克量的SWCNT可以以超过2 mg mL-1的浓度溶解。这些还原的SWCNT溶液可以通过添加烷基卤化物容易地官能化;减少接枝部分的空间体积和增加离去基团的极化率增加官能化的程度。在确定最大官能化程度时，25 mM的优化绝对钠浓度比碳与金属的比例更重要。这种新的溶解系统可以被修改为用作原料SWCNT粉末的非破坏性纯化途径，通过调节充电的程度，以溶解碳质杂质，催化剂颗粒和有缺陷的材料，然后处理剩余的SWCNT。
The use of N,N-dimethylformamide as a solvent for carbon nanotube reduction and dissolution allows simple and effective dissolution and purification. Reductive dissolution is a promising processing route for single walled carbon nanotubes (SWCNTs) that avoids the damage caused by ultrasonication and aggressive oxidation whilst simultaneously allowing access to a wealth of SWCNT functionalisation reactions. Here, reductive dissolution has been simplified to a single one-pot reaction through the use of sodium naphthalide in dimethylacetamide allowing direct synthesis of SWCNT Na+ solutions. Gram quantities of SWCNTs can be dissolved at concentrations over 2 mg mL–1. These reduced SWCNT solutions can easily be functionalised through the addition of alkyl halides; reducing steric bulk of the grafting moiety and increasing polarisability of the leaving group increases the extent of functionalisation. An optimised absolute sodium concentration of 25 mM is shown to be more important than carbon to metal ratio in determining the maximum degree of functionalisation. This novel dissolution system can be modified for use as a non-destructive purification route for raw SWCNT powder by adjusting the degree of charging to dissolve carbonaceous impurities, catalyst particles and defective material, before processing the remaining SWCNTs.