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Photoconductive Coaxial Nanotubes(Science 很有意思啊)
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Photoconductive Coaxial Nanotubes of Molecularly Connected Electron Donor and Acceptor Layers Yohei Yamamoto,1 Takanori Fukushima,1,2* Yuki Suna,1 Noriyuki Ishii,3 Akinori Saeki,4 Shu Seki,4 Seiichi Tagawa,4 Masateru Taniguchi,4 Tomoji Kawai,4 Takuzo Aida1,2* 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 p-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. 觉得有意思的就顶一下了！  [ Last edited by luo.henry on 2008-4-25 at 15:52 ] |
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