Different approaches to PVP/graphene composite film fabrication using electrohydrodynamic atomization technique

In this work a poly 4-vinlyphenol (PVP)/graphene composite film is fabricated by two different approaches i.e. blended and decorated (layer-by-layer i.e. LBL), using a reasonably inexpensive and less material consuming electrohydrodynamic atomization technique. Surface morphology of the fabricated composite film has been characterized by field emission scanning electron microscope and 3D Nano mapping. It has been observed that the film is uniform and has no voids and pores. Transmittance has been measured by UV–Visible spectroscopy, which showed nearly ~88.5 % of transparency in the visible region. PVP/graphene film has sandwiched as dielectric layer between indium tin oxide and poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS) as bottom and top electrodes, respectively, for capacitance measurement. PVP decorated graphene flakes (LBL) film showed better capacitance (1.22 × 10⁻² F/cm²) at 1 kHz in the voltage range of 0.1–0.2 V relative to a capacitance of 4.78 × 10⁻⁷ F/cm² at 1 kHz in the voltage range of −0.16 to 0.060 V fabricated by blended approach. It has been noticed that even at higher frequencies, a stable behavior as dielectric was observed. Besides this, a stable behavior was observed with the PVP/graphene (LBL) film even at higher frequencies.