Selective Suspension of Single-Walled Carbon Nanotubes Using 尾-Sheet Polypeptides

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• 作者：Nicole M. B. Cogan ; Charles J. Bowerman ; Lisa J. Nogaj ; Bradley L. Nilsson ; Todd D. Krauss
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：March 20, 2014
• 年：2014
• 卷：118
• 期：11
• 页码：5935-5944
• 全文大小：401K
• 年卷期：v.118,no.11(March 20, 2014)
• ISSN：1932-7455

文摘

Individual single-walled carbon nanotubes (SWNTs) were suspended in water using amphipathic 尾-sheet peptides of the general sequence Ac-(XKXE)₂-NH₂. By substituting natural and nonnatural amino acids of varying aromatic and hydrophobic character in the X position, the interactions between the peptide and the nanotube sidewall could be systematically varied. Surprisingly, enhancing the degree of favorable 蟺鈥撓€ and hydrophobic interactions, which strongly influence the self-assembly properties of these peptides, did not correlate with an improvement in nanotube dispersion efficiency. We found that substituents in the X-position of the peptides play a significant role in SWNT interaction and contributes to (n,m) structure specificity.