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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Self-organized perylene diimide nanofibers
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Self-organized perylene diimide nanofibers

机译：自组织per二酰亚胺纳米纤维

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摘要

A propeller-shaped perylene diimide trimer was synthesized and a simple evaporation method was used for the self-organization of trimer molecules into fluorescent nanofibers. The sizes of these fibers-from 4 to 150 nm in diameter-were measured by atomic force microscopy and can be controlled by adjusting the concentration of the initial solution. The aspect ratios (length/height) are around 500. The plane of the trimer was determined by polarized scanning confocal microscopy to be perpendicular to the axis of the fibers, in agreement with molecular mechanics calculations. UV/vis and NMR spectroscopies were used to monitor concentration-dependent pi-pi stacking in solution. Single-fiber fluorescence imaging and spectroscopy were performed using a total internal reflection fluorescence microscope equipped with a digital color camera and imaging CCD spectrometer. Strongly red-shifted fluorescence from these fibers indicates a high degree of electronic delocalization, and breaking up this delocalization by photobleaching blue-shifts the emission toward that of an isolated noninteracting molecule. The delocalization along these nanofibers and the ability to study the electronic structure using fluorescence make them potentially useful in nanoscale devices, such as field effect transistors and photoconductors.
机译：合成了螺旋桨状的ylene二酰亚胺三聚体，并使用简单的蒸发方法将三聚体分子自组织成荧光纳米纤维。这些纤维的尺寸（直径为4至150 nm）通过原子力显微镜测量，可以通过调节初始溶液的浓度来控制。长宽比（长度/高度）约为500。三聚体的平面通过偏振扫描共聚焦显微镜确定为垂直于纤维轴，与分子力学计算一致。 UV / vis和NMR光谱仪用于监测溶液中浓度依赖的pi-pi堆积。使用配备有数字彩色照相机和成像CCD光谱仪的全内反射荧光显微镜进行单纤维荧光成像和光谱分析。来自这些纤维的强烈红移荧光表明高度的电子离域，并且通过光漂白破坏这种离域，使发射向分离的非相互作用分子发射。沿着这些纳米纤维的离域化以及使用荧光研究电子结构的能力使它们潜在地用于纳米器件中，例如场效应晶体管和光电导体。

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