Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
Small. 2011 Oct 4;7(19):2793-800. doi: 10.1002/smll.201101000. Epub 2011 Aug 18.
The effect of the additive 1,8-octanedithiol (ODT) on the nanometer-scale morphology and local photophysical properties of low-bandgap polymer blends of poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b'] dithiophene)- alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) and [6,6]-phenyl C(61) -butyric acid methyl ester (PCBM) is investigated. Phase separations of the PCPDTBT:PCBM blend film induced by ODT are visualized by the morphological changes from fibril-shaped features to spherical bumps, by the dramatically increased photoluminescence emission from PCPDTBT that was originally largely quenched, and by the fluctuations of spectral features at different locations of the sample surface. The correlations between the morphology and the local photophysical properties of the blend film with/without ODT at both the micrometer and nanometer scales are revealed by confocal and high-resolution near-field spectroscopic mapping techniques.
研究了添加剂 1,8-辛二硫醇（ODT）对聚[2,6-(4,4-双(2-乙基己基)-4H-环戊二烯并[2,1-b;3,4-b']二噻吩)--alt-4,7(2,1,3-苯并噻二唑)]（PCPDTBT）和[6,6]-苯基 C(61)-丁酸甲酯（PCBM）的低带隙聚合物共混物的纳米级形貌和局部光物理性质的影响。通过形貌从纤维状特征到球形凸起的变化、原本被强烈猝灭的 PCPDTBT 的光致发光发射的显著增加以及样品表面不同位置的光谱特征的波动，观察到 ODT 诱导的 PCPDTBT:PCBM 共混膜的相分离。通过共焦和高分辨率近场光谱映射技术，揭示了共混膜在有/无 ODT 时在微米和纳米尺度上的形貌和局部光物理性质之间的相关性。
