Functionalization and dispersion of multiwalled carbon nanotubes modified with poly-l-lysine

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• 作者：Xinlong Ling ; Yizhe Wei ; Liming Zou ; Su Xu
• 关键词：Multiwalled carbon nanotubes ; Poly-l-lysine ; Functionalization ; Dispersion
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：20 February, 2014
• 年：2014
• 卷：443
• 期：Complete
• 页码：19-26
• 全文大小：2176 K

文摘

Poly-l-lysine (PLL) was synthesized using lysine as raw material by N-carboxyanhydride polymerization and characterized by Fourier transform infrared spectroscopy and ¹H NMR. Multiwalled carbon nanotubes (MWCNTs) were non-covalently functionalized using PLL in order to prepare MWCNTs-PLL composite. MWCNTs-PLL was characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis and UV-Vis absorption spectroscopy. The dispersion of MWCNTs-PLL composite was investigated by UV-Vis absorption spectroscopy, dynamic light scattering analysis and digital photograph. The results showed that the dispersion of MWCNTs-PLL composite was obviously better than that of MWCNTs-SDS composite in water while it was also approximate with that of MWCNTs-SDBS. In addition, MWCNTs-PLL was pH-responsive in water so that it could be used as bio-nanomaterial in future.