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Near-Infrared Absorbance of Single-Walled Carbon Nanotubes Dispersed in Dimethylformamide

Krupke, Ralph and Hennrich, F. and Hampe, Oliver and Kappes, Manfred M. (2003):
Near-Infrared Absorbance of Single-Walled Carbon Nanotubes Dispersed in Dimethylformamide.
In: The Journal of Physical Chemistry B, 107 (24), pp. 5667-5669, ISSN 1520-6106,
[Online-Edition: http://dx.doi.org/10.1021/jp034077w],
[Article]

Abstract

Absorption spectra of single-walled carbon nanotubes (SWNT) dispersed in dimethylformamide (DMF) have been recorded in the visible to near-infrared range. Besides broad absorption bands, the spectra show a sharp peak at 5187 cm-1, which has been attributed in the literature to the absorption of semiconducting nanotubes with a band gap of 0.64 eV [Ausman et al. J. Phys. Chem. B 2000, 104, 8911]. On the basis of absorbance measurements for samples that show the sharp absorbance peak but do not contain SWNTs, we conclude that the origin of the peak at 5187 cm-1 is not due to semiconducting nanotubes but due to water present in the SWNT/DMF suspension. A comparative study of D2O in DMF reproduces a similar peak that is isotope-shifted into the near-infrared.

Item Type: Article
Erschienen: 2003
Creators: Krupke, Ralph and Hennrich, F. and Hampe, Oliver and Kappes, Manfred M.
Title: Near-Infrared Absorbance of Single-Walled Carbon Nanotubes Dispersed in Dimethylformamide
Language: English
Abstract:

Absorption spectra of single-walled carbon nanotubes (SWNT) dispersed in dimethylformamide (DMF) have been recorded in the visible to near-infrared range. Besides broad absorption bands, the spectra show a sharp peak at 5187 cm-1, which has been attributed in the literature to the absorption of semiconducting nanotubes with a band gap of 0.64 eV [Ausman et al. J. Phys. Chem. B 2000, 104, 8911]. On the basis of absorbance measurements for samples that show the sharp absorbance peak but do not contain SWNTs, we conclude that the origin of the peak at 5187 cm-1 is not due to semiconducting nanotubes but due to water present in the SWNT/DMF suspension. A comparative study of D2O in DMF reproduces a similar peak that is isotope-shifted into the near-infrared.

Journal or Publication Title: The Journal of Physical Chemistry B
Volume: 107
Number: 24
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Nov 2011 13:44
Official URL: http://dx.doi.org/10.1021/jp034077w
Identification Number: doi:10.1021/jp034077w
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