fig3

Figure 3. (A-D) storage moduli (G^/) and loss moduli (G^//) of graphene oxide (GO) suspensions of frequency at different concentration degrees; e.g., 0.05, 0.25, 0.75, and 13.3 mg mL^-1, respectively^[75]; (E) MXene-based inks (with various concentrations) shear thinning behaviors suitable for uninterrupted extrusion through printing nozzles (diameter ~250 µm); (F) inks viscosity evolution over time for alternate minimum (0.01 s^-1) and maximum (1,000 s^-1) shear rates, illustrating suitable viscosity drop and post-printing recovery; (G) inks’ viscoelastic fingerprints demonstrating their solid-like behavior with large plateau regions (where G′ is unhampered of stress) and yield stresses (overlap point between G′ and G″) that elevate as the inks become more thickened (concentrated)^[79]; and (H) illustration of 2D materials-based 3D-printed architectures: serpentine electrode, woodpile electrode (scale-bar = 10 millimeter), rectangular-like hollow prism printed through 250 μm nozzle (number of printed layers = 25, reported scale-bar = 3 millimeter), and pectinate structure (two printed layers, scale-bar = 10 millimeter)/pyramid-like 3D-printed structure (number of printed layers = 12, scale-bar = 10 millimeter)/MXene printed font (three printed layers, scale-bar = 10 millimeter)^[79,83,84].