摘要
从羧基定量化出发,采用红外光谱法、热重分析法和X-射线光电子能谱法详尽研究了氧化处理方法与多壁碳纳米管(MW CNTs)上引入羧基量的关系。结果表明,硝酸氧化法、混酸氧化法和混酸与过氧化氢共同氧化法均可以使MW CNTs表面产生羧基。热重分析法和XPS分析法可以定量分析MW CNTs表面羧基的含量,并且分析结果相近。XPS分析表明,2.5m o l/L硝酸氧化48h可以使MW CNTs表面产生摩尔分数为4.80%的—COOH,而混酸(浓HNO3与浓H2SO4体积比为1∶3)氧化4h可产生摩尔分数为5.35%的—COOH,如果进一步由质量分数20%的过氧化氢氧化2h,MW CNTs表面产生的—COOH摩尔分数提高到7.55%。
Carboxylic groups were produced on the surface of MWCNTs by oxidation treatment. Carboxylic group contents were quantitively analyzed by FTIR, TGA and XPS. Results show that TGA and XPS analysis give similar carboxylic group contents on the surface of MWCNTs. For 2.5 mol/L nitric acid oxidation for 4 h, mixed acid oxidation for 4 h, and mixed acid oxidation for 4 h and then 20 % H2O2 oxidation for 2 h, 4.80, 5.35 and 7.55 mol% of carboxylic groups on the were respectively produced.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2006年第3期269-272,共4页
New Carbon Materials
关键词
多壁碳纳米管
表面修饰
羧基化
氧化处理
Multi-walled carbon nanotubes （MWCNTs）
Surface modification
Carboxylic group
Oxidation treatment
