Enhancement of chromic-piezoelectric sensitivity responses of polyvinylidene fluoride/polydiacetylene nanofibers using graphene oxide

The composite nanofiber of polyvinylidene fluoride (PVDF)/polydiacetylene (PDA) is one of the chromic and piezoelectric sensors. In this research, we investigated the effect of adding graphene oxide (GO) nanoparticle to this composite on chromic and piezoelectric properties of the PVDF/PDA/GO. We have also examined the mechanical properties of the PVDF/PDA/GO composite. 5 nanofiber samples with 23%w/v PVDF concentration and 1/3 diacetylene with 0.1, 0.5, 1, 1.5 and, 2.5 percent of GO were prepared via the hybrid electrospinning method. The nanofiber PVDF/PDA, PVDF/GO1% and PVDF were also produced as reference samples. The SEM images of PVDF/PDA/GO nanofibers show that the thinnest nanofibers could be obtained at 1% of GO proportion. In the FTIR test, the growth of β-phase of the sample PVDF/PDA/GO in comparison with PVDF/PDA without GO was obtained. Also, with putting up the samples in the oven of 40 °C and increasing the temperature up to 110 °C, the PVDF/PDA/GO shows same result with PVDF/PDA. In addition, they were thermochromics between 60–70 °C and reversible against the heat at 80 °C. In conclusion, the results show that adding 1% of GO nanoparticle to the PVDF/PDA/GO composite nanofiber can improve significantly the chromic and piezoelectric sensitivity of samples and also the mechanical and physical properties of the composite.