Shiraki Tomohiro, Haraguchi Shuichi, Tsuchiya Youichi, Shinkai Seiji
Nanotechnology Laboratory, Institute of Systems, Information Technologies and Nanotechnologies, 203-1 Moto-oka, Nishi-ku, Fukuoka 819-0385, Japan.
Chem Asian J. 2009 Sep 1;4(9):1434-41. doi: 10.1002/asia.200900175.
Assemblies of organic and inorganic compounds in the nanoscale region have contributed to the development of novel functional materials toward future applications, including sensors and opto-electronics. We succeed in fabricating hybrid nanowires composed of a conjugated polymer and semiconductor quantum dots (QDs) by a supramolecular assembly technique. The 1-D fashion of the nanowire structure is obtained by the polymer wrapping of cationic poly(phenylene ethynylene) (PPE) with helix-forming polysaccharide schizophyllan (SPG). The electrostatic interaction between cationic PPE and anionic QDs affords the nanowires decorated with QDs. Upon addition of an acceptor molecule, tetranitrofluorenone (TNF), the charge-transfer (CT) complex between PPE and TNF is formed, resulting in energy transfer from the QDs to PPE arising from the induced spectral overlap. Furthermore, the employment of the conjugated polymer allows highly sensitive quenching of the QD's emission by raising the transmission efficiency to the CT complexed electron deficient sites along the polymer backbone.
纳米级区域中有机和无机化合物的组装有助于开发面向未来应用的新型功能材料，包括传感器和光电子器件。我们通过超分子组装技术成功制备了由共轭聚合物和半导体量子点（QD）组成的混合纳米线。纳米线结构的一维形态是通过阳离子聚（亚苯基乙炔）（PPE）与形成螺旋的多糖裂褶菌多糖（SPG）进行聚合物包裹而获得的。阳离子PPE与阴离子QD之间的静电相互作用提供了装饰有QD的纳米线。加入受体分子四硝基芴酮（TNF）后，PPE与TNF之间形成电荷转移（CT）络合物，由于诱导的光谱重叠，导致能量从QD转移到PPE。此外，共轭聚合物的使用通过提高沿聚合物主链向CT络合的缺电子位点的传输效率，实现了QD发射的高度灵敏猝灭。
