The effect of the tube diameter and of the surface layer on the Raman spectra of WS2 nanotubes is investigated. With decreasing diameter, a disorder‐induced line in the A1g mode range, the D‐A1g line, is selectively enhanced. This enhancement is attributed to an increasing structural disorder in smaller nanotubes. On the other hand, no significant effect on the D‐A1g/A1g intensity ratio is observed for a Raman scan perpendicular to a 290 nm diameter tube. Therefore the enhancement of the disorder‐induced line is an intrinsic property of WS2 nanostructures and not a surface layer effect.
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Krause et al. (2009) studied this question.
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