Figure 2

(a) PhI images of usCNTs in fractions C1, C2, C3, C4 and C5 (excitation at 568 nm). (b) Cumulative distributions of PhI signals arising from single usCNTs. All images were displayed with the same intensity scale.

(a) PhI images of usCNTs in fractions C1, C2, C3, C4 and C5 (excitation at 568 nm). (b) Cumulative distributions of PhI signals arising from single usCNTs. All images were displayed with the same intensity scale.