Separation of Nickelocene‐Filled Single‐Walled Carbon Nanotubes by Conductivity Type and Diameter

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We have performed the separation of nickelocene‐filled single‐walled carbon nanotubes (SWCNTs) with a mean diameter of 1.7 nm by conductivity type and diameter using density gradient ultracentrifugation. The separated nanotube fractions were characterized by optical absorption spectroscopy (OAS), X‐ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The OAS investigation of the separated samples showed the absence of optical absorption bands of semiconducting tubes in metallic sample and vice versa , which proved a high purity of the nanotube fractions. The XPS investigation of the separated samples showed different positions, spectral widths and asymmetry of the C 1 s core level spectra. The multifrequency Raman spectroscopy investigation of the separated samples allowed performing an analysis of the diameter range of nanotubes. The demonstrated successful separation of the filled SWCNTs by conductivity type and diameter enables demanding applications of ultra pure SWCNTs with tailored properties.