Graphene doped nanofiber production and its applications

In recent years, interest in nanomaterials has increased considerably and it is aimed to obtain structures with superior properties by using such materials. Graphene is one of the leading nanomaterials thanks to its advantageous properties. Nanofiber applications are preferred in many application areas due to both their production method and ease of use. The use of such materials has helped to overcome many existing problems in many fields today, especially in biomedical applications. Nowadays, with the rapid developments in wireless sensors, and implantable or wearable electronic devices, the need for long-lasting power supplies is increasing. In this thesis study, a piezoelectric nanogenerator (PENG) that provides spontaneous energy generation by converting mechanical energy into electrical energy using body movements was designed. PVDF (Polyvinylidene Difluoride) polymer was used as the piezoelectric polymer in the PENG structure, and pure and doped nanocomposite nanofibers were obtained by adding Barium titanate (BaTiO3) nanoparticles and reduced graphene oxide (rGO) at different rates to this polymer. BaTiO3 and rGO additive improves the piezoelectric and dielectric properties of PENG. Structural characterization and electrical characterization measurements of the obtained nanocomposite fibers were made and their contribution rates were compared. Additionally, the PANI-rGO-PVA nanofiber electrode was produced as a conductive electrode. Thus, as a study aiming to provide continuous energy to wearable electronic devices in the biomedical field without the need for an external power source, the production parameters and properties of the materials required for flexible PENG design were investigated.