Visualizing the local optical response of semiconducting carbon nanotubes to DNA-wrapping

Huihong Qian, Paulo T. Araujo, Carsten Georgi, Tobias Gokus, Nicolai Hartmann, Alexander A. Green, Ado Jorio, Mark C. Hersam, Lukas Novotny, Achim Hartschuh

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Abstract

We studied the local optical response of semiconducting single-walled carbon nanotubes to wrapping by DNA segments using high resolution tip-enhanced near-field microscopy. Photoluminescence (PL) near-field images of single nanotubes reveal large DNA-wrapping-induced red shifts of the exciton energy that are two times higher than indicated by spatially averaging confocal microscopy. Near-field PL spectra taken along nanotubes feature two distinct PL bands resulting from DNA-wrapped and unwrapped nanotube segments. The transition between the two energy levels occurs on a length scale smaller than our spatial resolution of about 15 nm.

Original languageEnglish
Pages (from-to)2706-2711
Number of pages6
JournalNano letters
Volume8
Issue number9
DOIs
Publication statusPublished - Sep 1 2008

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ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Qian, H., Araujo, P. T., Georgi, C., Gokus, T., Hartmann, N., Green, A. A., Jorio, A., Hersam, M. C., Novotny, L., & Hartschuh, A. (2008). Visualizing the local optical response of semiconducting carbon nanotubes to DNA-wrapping. Nano letters, 8(9), 2706-2711. https://doi.org/10.1021/nl801038t