Effect of supercritical CO2 on the morphology and fluorescent behavior of fluorinated polyylidenefluorenes derivative/graphene oxide nanohybrids

Fluorinated polyylidenefluorenes derivative, poly [(9-ylidene-{2-tetradecyloxy-5-tetrafluorophthalimide-phenyl}fluorenyl-2,7-diyl)-alt-(1,4-phenyl)] (PFFB)/graphene oxide (GO) nanohybrids (SC-PFFB/GO) were successfully fabricated via a facile method with the assistance of supercritical CO2 (SC CO2). It was fascinating to observe that the photoluminescence (PL) intensity at 410 nm of SC-PFFB/GO was 6 times that of PFFB/GO. The experimental results of TEM characterization indicated that PFFB preferred to crystallize rather than form amorphous aggregates on GO nanosheets with the assistance of SC CO2. So our experimental results are a proof of concept that SC CO2 is an efficient method to help PFFB transfer from one morphology to another and the fluorescent behavior of the obtained nanohybrids can be improved greatly due to the effect of SC CO2.