Ambipolar-transporting Coaxial Nanotubes with a Tailored Molecular Graphene–Fullerene Heterojunction.


Yohei Yamamoto, Guanxin Zhang, Wusong Jin, Takanori Fukushima, Noriyuki Ishii, Akinori Saeki, Shu Seki, Seiichi Tagawa, Takeo Minari, Kazuhito Tsukagoshi, and Takuzo Aida


Proc. Nat. Acad. Sci. USA 2009, 106, 21051–21056.

[DOI: 10.1073/pnas.0905655106]

Ambiplar-transporting Coaxial Nanotubes with Molecular Graphene–Fullerene Hybrids
Despite a large steric bulk of C60, a molecular graphene with a covalently linked C60 pendant [hexabenzocoronene (HBC)–C60] self-assembles into a coaxial nanotube whose wall consists of a graphite-like π-stacked HBC array, whereas the nanotube surface is fully covered by a molecular layer of clustering C60. Because of this explicit coaxial configuration, the nanotube exhibits an ambipolar character in the field-effect transistor output [hole mobility (µh) = 9.7 x 10–7 cm2 V–1 s–1; electron mobility (µe) = 1.1 x 10–5 cm2 V–1 s–1] and displays a photovoltaic response upon light illumination.