Fig. 4From: In Situ Probing the Relaxation Properties of Ultrathin Polystyrene Films by Using Electric Force MicroscopyTime-elapsed isothermal discharging tendencies of ultrathin and normal thin PS films at different constant temperatures. a SPD of ultrathin PS film (6 nm) at 318 K with different initial surface potentials. b SPD of ultrathin PS film (6 nm) at 303, 308, and 318 K. c SPD of normal thin PS film (20 nm) at 328, 338, and 348 K. The normalized SPD with surface potential at 0 time as the reference is shown in the inset Back to article page