2, University of Arizona, Tucson, Arizona, United States
3, University of Arizona, Tucson, Arizona, United States
Chemically modified graphene (CMG) based materials such as graphene oxide (GO) and reduced graphene oxide (rGO) have attracted considerable attention as precursors for the fabrication of filtration membranes, RF circuits, supercapacitor and battery electrodes as well as anti-corrosive and thermal protection coatings. In this regard, we have developed a unique bulk coagulation procedure for the synthesis of transition metal incorporated GO and rGO colloidal dispersions (aqueous and non-aqueous) with controllable rheological properties. In particular, using these dispersions/inks in conjunction with traditional coating techniques as well as with ink-jet and 3-D paste-printing techniques, we demonstrate the ability to fabricate a wide variety of devices and structures. Particular attention is paid to optimizing ‘graphene-ink’ properties, such as viscosity, composition and conductivity for the targeted printing and characterization of CMG derived optically active thin films, plasmonic metamaterials and RF circuits. The versatility of using CMG based inks and pastes in the context of additive fabrication of multifunctional ‘material real-estates’ will also be highlighted.