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Updated: Feb 3, 2026

Synthesis and Functionalization of Nitrogen-doped Carbon Nanotube Cups with Gold Nanoparticles as Cork Stoppers
Published on: May 13, 2013
Surfactant-driven Amphoteric Doping of Carbon Nanotubes
Yoshiyuki Nonoguchi1,2, Atsushi Tani1, Tomoko Murayama1
1Division of Materials Science, Nara Institute of Science and Technology, Ikoma, 630-0192, Japan.
Abstract:
Aqueous surfactant dispersion is the most typical starting step to functionalize materials consisting of carbon nanotubes, but the effects of surfactants on the electronic properties are still unclear. Here we report how the functional groups of surfactants affect the electronic properties of carbon nanotube films. Using spectroscopic and thermoelectric characterization, we demonstrate that anionic and non-ionic surfactants contribute to the formation of p-type and n-type carbon nanotubes, respectively. Additionally, p-type doping with oxygen adsorption is found to compete with surfactants' doping. These findings are useful for designing the srarting carbon nanotube materials exhibiting desirable electronic properties.
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