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 | |
| Publication status | Published - Apr 2008 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Bioengineering
- Chemistry(all)
- Materials Science(all)
- Mechanical Engineering
Cite this
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 journal › Article
}
TY - JOUR
T1 - Protonation effects on the branching ratio in photoexcited single-walled carbon nanotube dispersions
AU - Blackburn, Jeffrey L.
AU - McDonald, Timothy J.
AU - Metzger, Wyatt K.
AU - Engtrakul, Chaiwat
AU - Rumbles, Gary
AU - Heben, Michael J.
PY - 2008/4
Y1 - 2008/4
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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U2 - 10.1021/nl072809g
DO - 10.1021/nl072809g
M3 - Article
VL - 8
SP - 1047
EP - 1054
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 4
ER -