Study of 尾 phase and Chains Aggregation Degrees in Poly(9,9-dioctylfluorene) (PFO) Solution

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• 作者：Long Huang ; Xinan Huang ; Guannan Sun ; Cheng Gu ; Dan Lu ; Yuguang Ma
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：April 12, 2012
• 年：2012
• 卷：116
• 期：14
• 页码：7993-7999
• 全文大小：551K
• 年卷期：v.116,no.14(April 12, 2012)
• ISSN：1932-7455

文摘

In this work, the effects of solvation and desolvation on the 尾 phase of poly(9,9-dioctylfluorene) (PFO) are studied. The content of 尾 phase is approximately calculated for comparison. The content of 尾 phase can be enhanced up to 40% by the solvation effect and become a metastable state; the desolvation effect is a dynamic process and can enhance the content of 尾 phase remarkably by 18%age units. It is found that the contents of 尾 phase are always changing with the aggregation degrees of PFO chains. To fully understand it, the concepts of mesoscopic aggregates and macroscopic aggregates are proposed and well proved by the filtration experiment. In the solution (the ethanol content less than 30%), the mesoscopic aggregates are beneficial to enhance the content of 尾 phase; in the solution (the ethanol content more than 40%), which is close to the condensed state of fabricated optoelectronic film, the macroscopic aggregates can make the content of 尾 phase not only much higher but also stable. The content of 尾 phase can be controlled by changing the aggregation characteristics of PFO chains in solution. This work will be significant in fabricating the optoelectronic devices from solutions to films with high carrier mobility and good stability.