Abstract
Carbon nanotubes (CNTs) with different chirality are great models to study the influence of channel electronic properties on ion transport through nanofluidic channels. We prepared short chirality-separated pure (6,5), (7,4), and (7,5)/(8,4) CNT porins (CNTPs), which have different electronic properties but are almost identical in diameter. Single channel conductance from potassium transport through these CNTPs indicates that electronic properties have a weak effect on ion transport. Sodium and lithium ion transport through different chirality CNTPs have also been studied. Chemical functionalities and defects on the CNTP walls can also influence transport properties. To address that possibility, we measured ion transport through fluorescence ultrashort nanotubes (FUNs) - functionalized channels with defective walls dispersed by surfactants such as CHAPS and SDOC. These channels have significantly lower conductance compared to the pristine (6,5) CNTPs. Finally, we discuss other factors that influence conductance in these nanofluidic channels.
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