Side-Chain Influence on the Mass Density and Refractive Index of Polyfluorenes and Star-Shaped Oligofluorene Truxenes
Side-Chain Influence on the Mass Density and Refractive Index of Polyfluorenes and Star-Shaped Oligofluorene Truxenes
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DOI：
10.1021/acs.jpcc.5b05526
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发表时间：
2015-09-24
影响因子：
3.7
通讯作者：
Turnbull, Graham A.
中科院分区：
文献类型：
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作者：
Morawska, Paulina O.;Wang, Yue;Turnbull, Graham A.
有机半导体薄膜的密度是一个重要的量，因为它与分子间的间距有关，而分子间的间距又决定了有机半导体薄膜的电子和物理性质。我们报告薄膜的密度和折射率的测量聚芴和星形低聚芴truxene分子。分别使用椭圆偏振仪和分光光度计测定旋涂膜的膜厚度和质量。我们提出了一个研究的烷基侧链长度上的体积质量密度和折射率的材料的影响。聚（9，9-二-正辛基芴）（PF 8）的密度为0.88 +/- 0.04 g/cm（3），并且随着烷基侧链的延长而降低。对于具有丁基侧链（T3丁基）的truxene分子，我们测量到密度为0.90 +/- 0.04 g/cm（3），其也随着侧链长度的增加而降低。
The density of organic semiconductor films is an important quantity because it is related to intermolecular spacing which in turn determines the electronic and photophysical properties. We report thin film density and refractive index measurements of polyfluorenes and star-shaped oligofluorene truxene molecules. An ellipsometer and a procedure using a spectrophotometer were used to determine film thickness and mass of spin-coated films, respectively. We present a study of the effect of alkyl side-chain length on the volumetric mass density and refractive index of the materials studied. The density measured for poly(9,9-di-n-octylfluorene) (PF8) was 0.88 +/- 0.04 g/cm(3) and decreased with longer alkyl side chains. For the truxene molecule with butyl side chains (T3 butyl), we measured a density of 0.90 +/- 0.04 g/cm(3), which also decreased with increasing side-chain length.