Side-chain influence on the mass density and refractive index of polyfluorenes and star-shaped oligofluorene truxenes
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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/cm3 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/cm3, which also decreased with increasing side-chain length.
Morawska , P O , Wang , Y , Ruseckas , A , Orofino-Penia , C , Kanibolotsky , A L , Santhanagopal , R , Fröhlich , N , Fritsch , M , Allard , S , Scherf , U , Skabara , P J , Samuel , I D W & Turnbull , G A 2015 , ' Side-chain influence on the mass density and refractive index of polyfluorenes and star-shaped oligofluorene truxenes ' Journal of Physical Chemistry C , vol 119 , no. 38 , pp. 22102-22107 . DOI: 10.1021/acs.jpcc.5b05526
Journal of Physical Chemistry C
Copyright © 2015 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1021/acs.jpcc.5b05526
DescriptionThis work is part of the TIRAMISU project, funded by the European Commission’s Seventh Framework Programme (FP7/2007-2013) under grant agreement n◦284747 and the Engineering and Physical Sciences Research Council (EPSRC) grants EP/J009016/1 and EP/F059922/1. I.D.W.S. and P.J.S. are Royal Society Wolfson Research Merit Award holders.
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