Modifying the Electronic Properties of Single-Walled Carbon Nanotubes using Designed Surfactant Peptides

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Modifying the Electronic Properties of Single-Walled Carbon Nanotubes using Designed Surfactant Peptides

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Title: Modifying the Electronic Properties of Single-Walled Carbon Nanotubes using Designed Surfactant Peptides
Author(s):
Samarajeewa, D. R.;
Dieckmann, Gregg R.;
Nielsen, Steven O. (UT Dallas);
Musselman, Inga H.
Format: Text
Item Type: Article
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Abstract: The electronic properties of carbon nanotubes can be altered significantly by modifying the nanotube surface. In this study, single-walled carbon nanotubes (SWCNTs) were functionalized noncovalently using designed surfactant peptides, and the resultant SWCNT electronic properties were investigated. These peptides have a common amino acid sequence of X(Valine) 5(Lysine) 2, where X indicates an aromatic amino acid containing either an electron-donating or electron-withdrawing functional group (i.e. p-amino-phenylalanine or p-cyano-phenylalanine). Circular dichroism spectra showed that the surfactant peptides primarily have random coil structures in an aqueous medium, both alone and in the presence of SWCNTs, simplifying analysis of the peptide/SWCNT interaction. The ability of the surfactant peptides to disperse individual SWCNTs in solution was verified using atomic force microscopy and ultraviolet-visible-near-infrared spectroscopy. The electronic properties of the surfactant peptide/SWCNT composites were examined using the observed nanotube Raman tangential band shifts and the observed additional features near the Fermi level in the scanning tunneling spectroscopy dI/dV spectra. The results revealed that SWCNTs functionalized with surfactant peptides containing electron-donor or electron-acceptor functional groups showed n-doped or p-doped altered electronic properties, respectively. This work unveils a facile and versatile approach to modify the intrinsic electronic properties of SWCNTs using a simple peptide structure, which is easily adaptable to obtain peptide/SWCNT composites for the design of tunable nanoscale electronic devices.
ISSN: 2040-3364
Persistent Link: http://hdl.handle.net/10735.1/3159
http://dx.doi.org/10.1039/c2nr30423f
Terms of Use: © 2012 The Royal Society of Chemistry Not to be further made available or distributed.

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