Journal
NANO LETTERS
Volume 3, Issue 7, Pages 969-972Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl0342141
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Electrochemical doping of HIPco nanotubes was studied in acetonitrile solution containing four different electrolytes (LiClO4, NMe4BF4, NBu4- ClO4, and NOct(4)ClO(4) (Me = methyl, Bu = butyl, Oct = octyl) and in two ionic liquids (1-butyl-3-methylimidazolium tetrafluoroborate and 1-butyl-3-methylimidazolium hexafluorophosphate). In situ Raman, spectroelectrochemistry confirms the diameter-selective loss of Raman resonance upon doping: nanotubes having diameters between 1 and 1.2 nm are less affected by doping than both narrower and wider tubes. The counterions, which compensate for the electronic charge in the solid, also influence the doping efficiency. The less-pronounced doping was traced for 1-butyl-3-methylimidazolium cations.
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