中文摘要：

通过聚醚酰亚胺修饰得到了氨基化的多壁碳纳米管，并采用傅里叶变换红外光谱、透射电镜、拉曼光谱和热重分析对产物进行表征。通过估算，平均每根383nm长的多壁碳纳米管接枝上了1200个聚醚酰亚胺分子，约含一级胺的数目为28万个，即平均每100个碳原子接上了1．8个一级胺，大大增加了多壁碳纳米管表面的氨基数量。此外，修饰后的碳纳米管的溶解度显著提高，约2mg／mL，利于进一步开发其在生物传感器、药物载带、组织工程、生物显像等生物医药领域的应用。

英文摘要：

Multi-walled carbon nanotubes （MWCNTs） were functionalized with polyethyleneimine （PEI）, thus introducting a plenty of amino groups onto their surface. The product was fully characterized by fourier transform infrared spectroscopy, transmission electron microscopy, Raman spectroscppy analysis and thermogravimetric analysis （TGA）. TGA analysis shows the PEI-grafting rate was 17.5%. It is estimated that, each PEI-MWCNT （ca 383 nm long） was grafted with 1200 PEI molecules, containing about 280 thousand amines, which means every 100 carbon atom connected with 1.8 amines. Meanwhile, the polyethyleneimine modification also improved the water solubility of MWCNTs, - 2 mg/mL. The synthesis of amino-functionalized and water soluble MWCNTs favors carbon nanotubes-based biomedical application, such as biosensors, drug carrier tape, tissue engineering, bio-imaging and other biomedical field, in the near future.