Photoconductive coaxial nanotubes of molecularly connected electron donor and acceptor layers
Photoconductive coaxial nanotubes of molecularly connected electron donor and acceptor layers
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DOI：
10.1126/science.1134441
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发表时间：
2006-12-15
期刊：
影响因子：
56.9
通讯作者：
Aida, Takuzo
中科院分区：
文献类型：
--
作者：
Yamamoto, Yohei;Fukushima, Takanori;Aida, Takuzo
三硝基芴酮附加的双星形两亲性六苯并冠烯的受控自组装选择性地形成具有不同光化学性质的纳米管或微纤维。在这些直径16纳米、长几微米的纳米管中，一层接受电子的三硝基芴酮分子层与一层提供电子的pi堆叠六苯并冠烯石墨层叠合在一起。同轴纳米管结构允许光化学产生空间分离的载流子和快速光导响应，其开/关比大于10(4)。与之形成鲜明对比的是，微纤维是由六苯并芴烯和三硝基芴酮部分之间的电荷转移络合物组成，几乎不产生光电流。
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.