酸氧化处理对多壁碳纳米管表面基团的影响  

The influence of acid oxidation on the functional groups of the surface of multi-walled carbon nanotubes

作　　者：周爱林[1] 王红娟[1] 傅小波[1] 彭峰[1] 余皓[1] 

机构地区：[1]华南理工大学化工与能源学院,广州510640

出　　处：《化工新型材料》2007年第7期37-39,共3页New Chemical Materials

基　　金：广东省自然科学基金(No.04300148)

摘　　要：120℃下用浓硝酸对多壁碳纳米管(MWCNTs)进行不同时间的酸氧化处理,考察处理前后碳纳米管的形貌和元素变化,分析酸氧化处理MWCNTs表面功能基团的种类和含量。结果表明:浓硝酸处理,可在MWCNTs表面产生不同数量的羧基、羟基和羰基含氧基团;在最初2 h内,羧基含量增加,羟基和羰基含量先增后减,含氧基团总量迅速增加;处理时间继续增加,羧基含量逐渐减少,羟基和羰基含量发生不规则变化,含氧基团总量趋于稳定;MWC-NTs表面首先形成羟基和羰基,这些基团继续被氧化生成羧基,并且它们被氧化生成羧基的能力不同,生成的羧基可进一步氧化最终以CO2释放出来;可通过控制浓硝酸处理的时间来控制MWCNTs表面含氧基团的种类和数量.The multi-walled carbon nanotubes （MWCNTs） were refluxed by concentrated nitric acid at 120℃ with different time. The morphology and elemental component of concentrated nitric acid treated MWCNTs were characterized. The functional groups and their amounts which were formed on the surface of the treated MWCNTs were analyzed. The results indicated that oxygeneous functional groups, such as carboxyl, hydroxyl and carbonyl, can been formed on the surface of MWCNTs treated by concentrated nitric acid. In the first 2 h, the amount of the carboxyl increasesd and the amounts of hydroxyl and carbonyl increased first and then decreased and the total amount of functional groups increased quickly with the increased of the treatment time. With the treatment continue, the amount of the carboxyl decreases and the amounts of hydroxyl and carbonyl vary irregularly and the total amount of functional groups almost arrived stable. The hydroxyl and earbonyl groups were firstly formed on the surface of the concentrated nitric acid treated MWCNTs and then were oxidized into earboxyl groups. The ability of the hydroxyl and earbonyl groups being oxidized are different. The formed carboxyl groups can been further oxidized into carbon dioxide which was released. Thus, the required oxygenous functional groups can been obtained by controlling the treatment time properly.

关 键 词：多壁碳纳米管 功能基团 基团含量 

分 类 号：O613.71[理学—无机化学]