Photoconductive Coaxial Nanotubes of Molecularly Connected Electron Donor and Acceptor Layers.

Yohei Yamamoto, Takanori Fukushima, Yuki Suna, Noriyuki Ishii, Akinori Saeki, Shu Seki, Seiichi Tagawa, Masateru Taniguchi, Tomoji Kawai, and Takuzo Aida

Science 2006, 314, 1761–1764.
[DOI: 10.1126/science.1134441]

Photoconductive Coaxial Nanotubes Composed of Donor/Acceptor Molecular Layers

  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 π-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 104. In sharp contrast, the microfibers consist of a charge-transfer complex between the hexabenzocoronene and trinitrofluorenone parts and exhibit almost no photocurrent generation.

Highlighted in Nature Nanotech. 2007, 2, 77: News & Views, C&EN, Chemistry World, Newscientist, nanotechweb, Technology Review