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Scaling behavior for ionic transport and its fluctuations in individual carbon nanotubes | | E. Secchi
; A. Nigues
; L. Jubin
; A. Siria
; L. Bocquet
; | | Date: |
3 Sep 2015 | | Abstract: | In this letter we perform an experimental study of ionic transport and
current fluctuations inside individual Carbon Nanotubes (CNT). The conductance
exhibits a power law behavior at low salinity, with an exponent close to 1/3
versus the salt concentration. This scaling behavior is rationalized in terms
of a model accounting for hydroxide adsorption at the (hydrophobic) carbon
surface, leading to a density dependent surface charge. This is in contrast to
boron nitride nanotubes which exhibit a constant surface conductance. Further
we measure the low frequency noise of the ionic current in CNT and show that
the amplitude of the noise scales with the surface charge, with data collapsing
on a master curve for the various studied CNT at a given pH. | | Source: | arXiv, 1509.1026 | | Services: | Forum | Review | PDF | Favorites | |
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