Abstract

Optical absorption can detect individual molecules and nanostructures even in dissipative or strongly quenching environments where fluorescence signals are weak. Here we image optical absorption of individual carbon nanotubes with subnanometer resolution. We show that we can discriminate adjacent nanotubes on a length scale far below the diffraction limit. Then we compare optical absorption imaging of a defect in a single carbon nanotube (CNT) with conventional scanning tunneling microscopy (STM) and conventional current-voltage scan (I-V) bandgap profiles. We directly visualize the penetration depth σ′ = 0.9 ± 0.3 nm of the CNT exciton state into the smaller bandgap region of the defect and derive a size σ = 1.8 ± 0.6 nm for the exciton state. Optical absorption provides a spectroscopic map of molecules simultaneously with conventional STM.

Original languageEnglish (US)
Pages (from-to)4897-4900
Number of pages4
JournalNano Letters
Volume10
Issue number12
DOIs
StatePublished - Dec 8 2010

Fingerprint

Light absorption
Carbon Nanotubes
optical absorption
spatial resolution
Imaging techniques
Carbon nanotubes
carbon nanotubes
Scanning tunneling microscopy
room temperature
Excitons
scanning tunneling microscopy
Energy gap
excitons
Temperature
Defects
Molecules
defects
Nanotubes
molecules
Quenching

Keywords

  • Carbon nanotubes
  • exciton
  • scanning tunneling microscopy
  • soliton
  • spectroscopy

ASJC Scopus subject areas

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

Cite this

Direct imaging of room temperature optical absorption with subnanometer spatial resolution. / Scott, Gregory; Ashtekar, Sumit; Lyding, Joseph; Gruebele, Martin.

In: Nano Letters, Vol. 10, No. 12, 08.12.2010, p. 4897-4900.

Research output: Contribution to journalArticle

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