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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.
Chemistry, an Asian Journal
|October 26, 2018
Summary
Surfactants significantly alter carbon nanotube (CNT) electronic properties. Anionic surfactants create p-type CNTs, while non-ionic surfactants yield n-type CNTs, impacting material design.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Aqueous surfactant dispersion is common for functionalizing carbon nanotubes (CNTs).
- The impact of surfactants on CNT electronic properties remains poorly understood.
- Controlling CNT electronic properties is crucial for advanced material applications.
Purpose of the Study:
- To investigate how surfactant functional groups influence the electronic properties of carbon nanotube films.
- To elucidate the mechanisms behind surfactant-induced doping in CNTs.
- To provide insights for designing CNT materials with tailored electronic characteristics.
Main Methods:
- Spectroscopic characterization techniques were employed.
- Thermoelectric measurements were utilized to assess electronic properties.
- Different types of surfactants (anionic and non-ionic) were systematically studied.
Main Results:
- Anionic surfactants induced p-type semiconducting behavior in CNT films.
- Non-ionic surfactants led to n-type semiconducting behavior in CNT films.
- Oxygen adsorption was observed to compete with surfactant doping, primarily causing p-type doping.
Conclusions:
- Surfactant choice critically determines the type of doping (p-type or n-type) in carbon nanotube films.
- Understanding surfactant-doping interactions is key for controlling CNT electronic properties.
- These findings facilitate the rational design of CNT-based electronic materials.
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