Chemical functionalization of multiwalled carbon nanotubes by hexamethylene diamine
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摘要: 为获得两端具有活性端胺基的碳纳米管，通过化学方法对多壁碳纳米管（MWCNTs）接枝改性，利用氯化亚砜将MWCNTs酸处理产生的羧基转化为酰氯，进一步与1.6-己二胺发生亲核取代反应，将1.6-己二胺接枝到碳纳米管端部。采用X射线光电子能谱（XPS）、透射电镜（TEM）及扫描电镜（SEM）对化学修饰过程中各反应产物进行表征。结果表明：酸的切割作用，使碳纳米管从端帽下及管壁缺陷处打开，碳管长度由十几微米变为500nm左右；1.6-己二胺成功地接枝到碳纳米管端部，能谱分析（EDS）结果表明N元素接枝率达3.29%，接枝后的碳纳米管可以均匀分散在丙酮溶液中，并含有活性端胺基。Abstract: Multiwalled carbon nanotubes (MWCNTs) were modified by grafting with hexamethylene diamine to obtain reactive amine groups. Acid treatment was used to shorten the MWCNTs by cutting at defect sites. Carboxyl groups produced by the acid treatment were converted to carbonyl chloride by thionyl chloride, and hexamethylene diamine was grafted to the ends of the cut MWCNTs by its substitutional reaction with carbonyl chloride. XPS, TEM and SEM were used to characterize the samples during the course of modification. Results indicated that MWCNTs were shortened from tens of microns to about 500 nm by the acid treatment. Hexamethylene diamine was successfully grafted onto the ends of the MWCNTs with a grafted N content as high as 3.29 mol %. The grafted MWCNTs can be dispersed uniformly in acetone.
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