Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
Small. 2010 Dec 6;6(23):2731-40. doi: 10.1002/smll.201001344.
Extremely long nanofibers, whose lengths reach the millimeter regime, are generated via co-aggregation of a melamine-appended perylene bisimide semiconductor and a substituted cyanurate, both of which are ditopic triple-hydrogen-bonding building blocks; they co-aggregate in an unexpected stoichiometrically mismatched 1:2 ratio. Various microscopic and X-ray diffraction studies suggest that hydrogen-bonded polymeric chains are formed along the long axis of the nanofibers by the 1:2 complexation of the two components, which further stack along the short axis of the nanofibers. The photocarrier generation mechanism in the nanofibers is investigated by time-of-flight (TOF) experiments under electric and magnetic fields, revealing the birth and efficient recombination of singlet geminate electron-hole pairs. Flash-photolysis time-resolved microwave conductivity (FP-TRMC) measurements revealed intrinsic 1D electron mobilities up to 0.6 cm(2) V(-1) s(-1) within nanofibers.
超长纳米纤维的长度达到毫米级，是通过三聚氰胺修饰的苝二酰亚胺半导体和取代的氰尿酸共聚集产生的，两者都是双位三重氢键构筑块；它们以出人意料的化学计量不匹配的 1:2 比例共聚集。各种微观和 X 射线衍射研究表明，通过两种组分的 1:2 络合，沿纳米纤维的长轴形成氢键聚合物链，这些聚合物链进一步沿纳米纤维的短轴堆叠。通过电场和磁场下的飞行时间（TOF）实验研究了纳米纤维中的光生载流子产生机制，揭示了单重态孪生电子-空穴对的产生和有效复合。闪光光解时间分辨微波电导率（FP-TRMC）测量表明，纳米纤维内固有 1D 电子迁移率高达 0.6 cm(2) V(-1) s(-1)。
