Fig. 3. (a) Schematic diagram of the cross-section of the graphene/TiO2-NS/graphene capacitors. (b) Photograph of the inkjet-printed capacitor devices on glass. Scale bar ∼500 μm. (c) Optical micrograph of fully inkjet-printed capacitors on glass. (d) Measured capacitance versus frequency for inkjet-printed capacitors made with different numbers of TiO2-NS print passes. (e) Resistance values versus frequency of inkjet-printed capacitors made with different numbers of print passes.
