To understand the chiroptical responses of polyfluorene- phenylene (PFP) films, circular dichroism (CD), surface-enhanced Raman scattering (SERS), attenuated total reflection (ATR), and spectroscopic ellipsometry studies were performed. The pristine PFP films exhibited significant CD at room temperature, and the chirality increased by thermal annealing at 120 °C (above the glass transition temperature). SERS and ATR spectra indicated that the chirality enhancement was due to the rearrangement of the polymer backbones on the glass substrate by thermal annealing and/or self-organization. In addition, comparison of PFP and polyfluorene polymers indicated that molecular structure of polymer backbone plays an important role in the chiroptical responses of the chiral polymers.
Bibliographical noteFunding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea funded by the Korean government [Grant numbers 2015R1D1A1A01057501 (Lee), NRF-2010-0027963 (PBRC)], and in part by Kwangwoon University in 2015. This research was supported by the National Research Foundation of Korea (NRF2012R1A2A1A01008797).
© 2016 Optical Society of America.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials