J-Aggregate Behavior in Poly-3-hexylthiophene Nanofibers
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- 作者：Edwards T. Niles ; John D. Roehling ; Hajime Yamagata ; Adam J. Wise ; Frank C. Spano ; Adam J. Moul茅 ; John K. Grey
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：January 19, 2012
- 年：2012
- 卷：3
- 期：2
- 页码：259-263
- 全文大小：279K
- 年卷期：v.3,no.2(January 19, 2012)
- ISSN：1948-7185
文摘
Nanofibers (NFs) of poly-3-hexylthiophene (P3HT) assembled in toluene exhibit single-chain J-aggregate character. Absorption, fluorescence emission, and Raman spectroscopy of dilute NF dispersions demonstrate that P3HT chains possess long-range intrachain order (planarity) that suppresses interchain exciton coupling. We demonstrate that a delicate interplay exists between intrachain order and interchain coupling as revealed through the emission 0鈥?/0鈥? vibronic intensity ratios. Lowering temperature and application of pressure induces minor perturbations in the NF packing, which destroys J-aggregate character and partially restores predominant interchain interactions (i.e., H-aggregate behavior). The fact that 蟺鈥撓€ stacked P3HT chains can exhibit both H- and J-aggregate behavior opens up new possibilities for controlling electronic coupling through noncovalent stacking interactions.