Interaction of Tyrosine-, Tryptophan-, and Lysine-Containing Polypeptides with Single-Wall Carbon Nanotubes and Its Relevance for the Rational Design of Dispersing Agents

详细信息    查看全文

• 作者：Christoph G. Salzmann ; Michael A. H. Ward ; Robert M. J. Jacobs ; Gerard Tobias ; Malcolm L. H. Green
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：December 20, 2007
• 年：2007
• 卷：111
• 期：50
• 页码：18520 - 18524
• 全文大小：242K
• 年卷期：v.111,no.50(December 20, 2007)
• ISSN：1932-7455

文摘

The polypeptides poly-L-(Trp,Lys·HBr) (Trp/Lys·HBr = n/m) and poly-L-(Tyr,Lys·HBr) (Tyr/Lys·HBr =n/m) were tested as dispersing agents for single-wall carbon nanotubes (SWCNTs) for n/(n+m) values of 0,0.2, and 1. Best results were obtained for the two copolymers, illustrating the importance of using amphiphilicdispersing agents. The dispersion effect is 3.5 times higher for the copolymer containing tryptophan, indicatinga stronger interaction of the tryptophan residue with the SWCNTs compared to tyrosine. The degrees ofdebundling of the SWCNTs and the apparent binding of the polypeptides with the SWCNTs are analyzed byatomic force microscopy for the different dispersions. The interactions of the aromatic amino acid residueswith the SWCNTs are further probed by using optical absorbance and fluorescence spectroscopy.