H-Aggregated Form II Spherulite of Poly(3-butylthiophene) Grown from Solution

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• 作者：Yunpeng Qu ; Qing Su ; Sijun Li ; Guanghao Lu ; Xun Zhou ; Jidong Zhang ; Zhaobin Chen ; Xiaoniu Yang
• 刊名：ACS Macro Letters
• 出版年：2012
• 出版时间：November 20, 2012
• 年：2012
• 卷：1
• 期：11
• 页码：1274-1278
• 全文大小：394K
• 年卷期：v.1,no.11(November 20, 2012)
• ISSN：2161-1653

文摘

New large-size poly(3-butylthiophene) (P3BT) spherulites are obtained by solution aging. These P3BT spherulites are composed of nanoribbons, and the P3BT molecules arrange into Form II structure with a backbone 蟺-stacking distance of 0.47 nm. P3BT lamellae adopt 鈥渇lat-on鈥?orientation at the edge of the spherulite, and the spherulite preferentially grows along the 蟺鈥撓€ stacking direction. These spherulites could be obtained in bulk solution or at the top or bottom of the solution, depending on the competition of gravity and Brownian motion. Temperature-dependent photoluminescence spectra demonstrate that the polymer chains are arranged in H-aggregation model. The 0鈥? transition in UV鈥搗isible absorption spectra blue shifts from 2.03 eV (610 nm, Form I) to 2.11 eV (589 nm, Form II). These results provide a further understanding of the crystallization and photophysical properties of poly(3-alkylthiophene) (P3AT), and the preparation method of large size and pure P3AT spherulites shows potential in applications of organic electronics.