The quantitative characterization of the dispersion state of single-walled carbon nanotubes using Raman spectroscopy and atomic force microscopy

Dokyung Yoon, Jae Boong Choi, Chang Soo Han, Young Jin Kim, Seunghyun Baik

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21 Citations (Scopus)


A quantitative method to evaluate the degree of dispersion of single-walled carbon nanotubes (SWCNTs), produced by the high-pressure carbon monoxide process, was developed using Raman spectroscopy and atomic force microscopy (AFM). Nanotubes were dispersed in sodium dodecyl sulfate aqueous solution at seven different dispersion states by controlling ultra-sonication and centrifugation parameters. It is known that the intensity of a Raman peak at 267 cm-1, at the excitation wavelength of 785 nm, is qualitatively proportional to the degree of aggregation. Here, we provide a quantitative calibration technique which involves single-layer spin-deposition of SWCNTs on mica substrates and z-scan analysis of AFM. The trend of the height measurements of AFM precisely matched that of the Raman peak at 267 cm-1. Therefore, this approach can be used to quantitatively characterize the dispersion state of SWCNTs.

Original languageEnglish
Pages (from-to)1530-1534
Number of pages5
Issue number12
Publication statusPublished - 2008 Oct 1
Externally publishedYes


ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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