This paper demonstrates the viability of inkjet printing as a method for large-area fabrication of graphene-based devices. The authors produce a graphene-based ink through liquid phase exfoliation of graphite in N-Methylpyrrolidone (NMP) and use it to print thin-film transistors with mobilities up to ~95 cm²V⁻¹s⁻¹, as well as transparent and conductive patterns with ~80% transmittance and ~30 kΩ/□ sheet resistance. The study highlights the potential of all-printed, flexible, and transparent graphene devices on arbitrary substrates. The research also explores the influence of substrate surface treatments on the printing process, showing that HMDS treatment can improve the uniformity and adhesion of graphene flakes. Additionally, the authors combine graphene with an organic semiconductor, PQT-12, to fabricate devices with improved performance, achieving a mobility of ~0.2 cm²V⁻¹s⁻¹ and an ON/OFF ratio of ~4 × 10⁵. The findings suggest that graphene-inks have significant potential for flexible and transparent electronics.This paper demonstrates the viability of inkjet printing as a method for large-area fabrication of graphene-based devices. The authors produce a graphene-based ink through liquid phase exfoliation of graphite in N-Methylpyrrolidone (NMP) and use it to print thin-film transistors with mobilities up to ~95 cm²V⁻¹s⁻¹, as well as transparent and conductive patterns with ~80% transmittance and ~30 kΩ/□ sheet resistance. The study highlights the potential of all-printed, flexible, and transparent graphene devices on arbitrary substrates. The research also explores the influence of substrate surface treatments on the printing process, showing that HMDS treatment can improve the uniformity and adhesion of graphene flakes. Additionally, the authors combine graphene with an organic semiconductor, PQT-12, to fabricate devices with improved performance, achieving a mobility of ~0.2 cm²V⁻¹s⁻¹ and an ON/OFF ratio of ~4 × 10⁵. The findings suggest that graphene-inks have significant potential for flexible and transparent electronics.