Journal
NANO LETTERS
Volume 16, Issue 11, Pages 6903-6909Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b02819
Keywords
SWCNT; quantitative analysis; absorption cross section; molar absorptivity; fluctuation spectroscopy; SWIR spectroscopy
Categories
Funding
- National Science Foundation [CHE-1409698]
- Welch Foundation [C-0807]
- National Science Foundation through an AGEP-GRS award [CHE-1549024]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1409698] Funding Source: National Science Foundation
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A new method based on variance spectroscopy has enabled the determination of absolute absorption cross sections for the first electronic transition of 12 (n,m) structural species of semiconducting single-walled carbon nanotubes (SWCNTs). Spectrally resolved measurements of fluorescence variance in dilute bulk samples provided particle number concentrations of specific SWCNT species. These values were converted to carbon concentrations and correlated with resonant components in the absorbance spectrum to deduce (n,m)-specific absorption cross sections (absorptivities) for nanotubes ranging in diameter from 0.69 to 1.03 nm. The measured cross sections per atom tend to vary inversely with nanotube diameter and are slightly greater for structures of mod 1 type than for mod 2. Directly measured and extrapolated values are now available to support quantitative analysis of SWCNT samples through absorption spectroscopy.
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