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

Jeffrey L. Blackburn; Timothy J. McDonald; Wyatt K. Metzger; Chaiwat Engtrakul; Garry Rumbles; Michael J. Heben

doi:10.1021/nl072809g

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

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

National Renewable Energy Laboratory

Research output: Contribution to journal › Article

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 language	English
Pages (from-to)	1047-1054
Number of pages	8
Journal	Nano letters
Volume	8
Issue number	4
DOIs	https://doi.org/10.1021/nl072809g
Publication status	Published - Apr 1 2008

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ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
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

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title = "Protonation effects on the branching ratio in photoexcited single-walled carbon nanotube dispersions",

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.",

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AU - Engtrakul, Chaiwat

AU - Rumbles, Garry

AU - Heben, Michael J.

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N2 - 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.

AB - 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.

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10.1021/nl072809g