P.Bernier suggested that exact limits for the diameter should be given, e. g. up to 10 nm for nanotubes and ca. 100 nm for filaments. Nanotubes show an unusual conductivity (quantum behavior), which can be metallic or semiconducting and differs from the classical conductivity of macroscopic carbon systems. L. P.Biro added that the STS spectrum of thick carbon nanotubes (ca. 30 nm) is similar, if not identical, to that of graphite and does not reveal the characteristic features of nanotubes with diameters smaller than 30 nm. According to theory, the electronic band gap of a nanotube shrinks with increasing diameter and therfore this gap could be used to indirectly determine tube diameters.
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机译：P.Bernier建议应给出直径的确切限制，例如。 G。对于纳米管和约10 nm。灯丝为100 nm。纳米管显示出异常的电导率（量子行为），它可以是金属或半导体，并且不同于宏观碳系统的经典电导率。 L. P. Biro补充说，厚碳纳米管（约30 nm）的STS光谱即使不相同也与石墨相似，并且没有揭示直径小于30 nm的纳米管的特征。根据理论，纳米管的电子带隙会随着直径的增加而收缩，因此该间隙可用于间接确定管的直径。
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