Optical absorption and transient photobleaching in solutions of surfactant encapsulated and DNA wrapped single-walled carbon nanotubes

Michael S. Arnold, Song Lan, Samantha C. Cruz, Jay E. Sharping, Samuel I. Stupp, Prem Kumar, Mark C. Hersam

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

Optical absorption and transient photobleaching in solutions of surfactant encapsulated and DNA wrapped single-walled carbon nanotubes (SWNTs) are studied. Optical transitions between van Hove singularities are red shifted in solutions of DNA wrapped SWNTs compared with transitions in solutions of sodium dodecyl sulfate (SDS) encapsulated SWNTs. This red shift may be due to changes in the local surrounding dielectric constant and corresponding changes in charge screening. Transient photobleaching at the E11 transition of semiconducting SWNTs is observed in both solutions of SDS encapsulated SWNTs and DNA wrapped SWNTs in response to optical excitation at corresponding E 22 transitions, and the saturation of photobleaching at high excitation intensities greater than 500 W cm-2 is studied. It is found that the photobleaching intensity does not saturate as significantly in solutions of DNA wrapped SWNTs as in solutions of SDS isolated SWNTs. Lastly, using degenerate, delayed pump-probe characterization, the temporal relaxation of excited charge carriers is investigated. Measured decays are characterized by both fast and slow processes. The slow decay time constant across the band gap of semiconducting SWNTs is fit to 120 ps for SDS encapsulated SWNTs and 73 ps for DNA wrapped SWNTs.

Original languageEnglish
Pages (from-to)376-386
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5359
DOIs
Publication statusPublished - Sep 13 2004
EventQuantum Sensing and Nanophotonic Devices - San Jose, CA, United States
Duration: Jan 25 2004Jan 29 2004

Keywords

  • Absorption
  • Buckytube
  • Carbon nanotube
  • Deoxyribose nucleic acid
  • DNA
  • Isolated
  • Optical
  • Photobleaching
  • SDS
  • Sodium dodecyl sulfate
  • Surfactant
  • SWNT

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Optical absorption and transient photobleaching in solutions of surfactant encapsulated and DNA wrapped single-walled carbon nanotubes'. Together they form a unique fingerprint.

  • Cite this