Chemometric determination of the length distribution of single walled carbon nanotubes through optical spectroscopy

Length-dependent performances of sodium deoxycholate-dispersed single-walled carbon nanotube thin-film transistors

“…The on-currents observed in this study are lower than several previous studies. [9][10][11]31,35 This can be attributed to three reasons: (i) surfactant-wrapped SWCNTs were used in study, while DNA-wrapped SWCNTs were used by some other studies. 9,10,31 Surfactants, such as DOC, would fully cover the surface of SWCNTs.…”

“…[9][10][11]31,35 This can be attributed to three reasons: (i) surfactant-wrapped SWCNTs were used in study, while DNA-wrapped SWCNTs were used by some other studies. 9,10,31 Surfactants, such as DOC, would fully cover the surface of SWCNTs. In contrast, DNA would only partially cover the surface of nanotubes.…”

“…(ii) We used a device channel length of 50 lm, which is longer than some previous studies. 10,31 When the channel length is longer, more SWCNTs are required to form conductive paths, resulting in more tube-tube contacts.…”

“…26 The details of the length sorting method were described in our previous publication. 31 Briefly, the density gradients were formed by mixing iodixanol [60% (w/v); Sigma, St. Louis, MO] with proper amount of 2 wt% DOC solutions or SWCNT supernatants. Four different layers were introduced in a centrifugation tube (12 mL), from the bottom to the top: 0.5 mL of 40% iodixanol, 0.5 mL of 30% iodixanol, 0.8 mL of 20% iodixanol containing 0.267 mL dispersed SWCNTs, and 8.2 mL of 18% iodixanol.…”

Fractionation of carboxylated carbon nanotubes and the corresponding variation in their colloidal behavior

“…9,10 It is important to realize that CNTs represent a diverse group of nanotubes that vary in size, shape and chirality. Biological behavior 11 and dispersibility 12 are also known to be functions of length, and therefore there is a need to study their fate and transport as a function of length. The size dependent behavior of CNTs is yet to be studied in detail.…”