title: Photoconductive coaxial nanotubes of molecularly connected electron donor and acceptor layers.
abstract: Controlled self-assembly of a trinitrofluorenone-appended gemini-shaped amphiphilic hexabenzocoronene selectively formed nanotubes or microfibers with different photochemical properties. In these nanotubes, which are 16 nanometers in diameter and several micrometers long, a molecular layer of electron-accepting trinitrofluorenone laminates an electron-donating graphitic layer of pi-stacked hexabenzocoronene. The coaxial nanotubular structure allows photochemical generation of spatially separated charge carriers and a quick photoconductive response with a large on/off ratio greater than 10(4). In sharp contrast, the microfibers consist of a charge-transfer complex between the hexabenzocoronene and trinitrofluorenone parts and exhibit almost no photocurrent generation.
authors.affiliation: Exploratory Research for Advanced Technology-Solution Oriented Research for Science and Technology (ERATO-SORST), Japan Science and Technology Agency, National Museum of Emerging Science and Innovation, 2-41 Aomi, Koto-ku, Tokyo 135-0064, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Takanori
authors.initials: T
authors.lastname: Fukushima
authors.forename: Yuki
authors.initials: Y
authors.lastname: Suna
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Ishii
authors.forename: Akinori
authors.initials: A
authors.lastname: Saeki
authors.forename: Shu
authors.initials: S
authors.lastname: Seki
authors.forename: Seiichi
authors.initials: S
authors.lastname: Tagawa
authors.forename: Masateru
authors.initials: M
authors.lastname: Taniguchi
authors.forename: Tomoji
authors.initials: T
authors.lastname: Kawai
authors.forename: Takuzo
authors.initials: T
authors.lastname: Aida