Protonation effects on the branching ratio in photoexcited single-walled carbon nanotube dispersions

Jeffrey L. Blackburn, Timothy J. McDonald, Wyatt K. Metzger, Chaiwat Engtrakul, Gary Rumbles, Michael J. Heben

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The ensemble PL quantum yield for raw single-walled carbon nanotubes (SWNTs) dispersed in sodium ctiolate (SC) is ∼5 times greater than that for the same raw SWNTs dispersed in sodium dodecyl sulfate (SDS) and ∼10 times greater than the quantum yield of purified SWNTs dispersed In SC. Absorbance and Raman spectra indicate that purified SC-dispersed SWNTs and raw SDS-dispersed SWNTs are hole-doped by protonation. Experiments comparing PL emission efficiency using E 2 and E 1 excitation show that protonation significantly affects the E 2 → E 1 relaxation process, which has typically been assumed to occur with unit efficiency. The E 2 → E 1 relaxation is 5 times more efficient in producing E 1 PL when SWNTs are unprotonated and protected by the SC surfactant. The results provide clear evidence that extrinsic factors, such as residual acids and the specific nature of SWNT-surfactant and SWNT-solvent interactions, can significantly affect measured SWNT luminescence quantum yields.

Original languageEnglish
Pages (from-to)1047-1054
Number of pages8
JournalNano Letters
Volume8
Issue number4
DOIs
Publication statusPublished - Apr 2008

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Protonation
Single-walled carbon nanotubes (SWCN)
Dispersions
carbon nanotubes
Quantum yield
Sodium
sodium
Sodium dodecyl sulfate
sodium sulfates
Surface-Active Agents
Sodium Dodecyl Sulfate
PL/1
Surface active agents
surfactants
Relaxation processes
Raman scattering
Luminescence
luminescence
Raman spectra
acids

ASJC Scopus subject areas

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

Cite this

Blackburn, J. L., McDonald, T. J., Metzger, W. K., Engtrakul, C., Rumbles, G., & Heben, M. J. (2008). Protonation effects on the branching ratio in photoexcited single-walled carbon nanotube dispersions. Nano Letters, 8(4), 1047-1054. https://doi.org/10.1021/nl072809g

Protonation effects on the branching ratio in photoexcited single-walled carbon nanotube dispersions. / Blackburn, Jeffrey L.; McDonald, Timothy J.; Metzger, Wyatt K.; Engtrakul, Chaiwat; Rumbles, Gary; Heben, Michael J.

In: Nano Letters, Vol. 8, No. 4, 04.2008, p. 1047-1054.

Research output: Contribution to journalArticle

Blackburn, JL, McDonald, TJ, Metzger, WK, Engtrakul, C, Rumbles, G & Heben, MJ 2008, 'Protonation effects on the branching ratio in photoexcited single-walled carbon nanotube dispersions', Nano Letters, vol. 8, no. 4, pp. 1047-1054. https://doi.org/10.1021/nl072809g
Blackburn, Jeffrey L. ; McDonald, Timothy J. ; Metzger, Wyatt K. ; Engtrakul, Chaiwat ; Rumbles, Gary ; Heben, Michael J. / Protonation effects on the branching ratio in photoexcited single-walled carbon nanotube dispersions. In: Nano Letters. 2008 ; Vol. 8, No. 4. pp. 1047-1054.
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