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

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dc.contributor.authorSamarajeewa, D. R.en_US
dc.contributor.authorDieckmann, Gregg R.en_US
dc.contributor.authorNielsen, Steven O.en_US
dc.contributor.authorMusselman, Inga H.en_US
dc.contributor.utdAuthorNielsen, Steven O.en_US
dc.contributor.utdAuthorMusselman, Inga H.en_US
dc.date.accessioned2014-03-14T21:42:52Z
dc.date.available2014-03-14T21:42:52Z
dc.date.created2012-05-25en_US
dc.date.issued2012-05-25en_US
dc.description.abstractThe 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.en_US
dc.identifier"The support for this project by a Young Investigator’s Grant from the Human Frontier Science Program (GRD; grant RGY0070/2005-C) is greatly appreciated."en_US
dc.identifier.bibliographicCitationSamarajeewa, D. R., G. R. Dieckmann, S. O. Nielsen, and I. H. Musselman. 2012. "Modifying the electronic properties of single-walled carbon nanotubes using designed surfactant peptides." Nanoscale 4(15): 4544-4554.en_US
dc.identifier.issn2040-3364en_US
dc.identifier.issue15en_US
dc.identifier.startpage4544en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/3159
dc.identifier.volume4en_US
dc.relation.urihttp://dx.doi.org/10.1039/c2nr30423f
dc.rights©2012 The Royal Society of Chemistry Not to be further made available or distributed.en_US
dc.sourceNanoscale
dc.subjectNanoscienceen_US
dc.subjectNanotechnologyen_US
dc.subjectMaterials scienceen_US
dc.subjectNanotubes, Carbonen_US
dc.subjectCircular dichroismen_US
dc.subjectPeptidesen_US
dc.titleModifying the Electronic Properties of Single-Walled Carbon Nanotubes using Designed Surfactant Peptidesen_US
dc.typeTexten_US
dc.type.genreArticleen_US

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Musselman, Inga H.
Dieckmann, Gregg R.
Nielsen, Steven O.
NSM Staff-Student Research