Fig. 2From: Piezoelectric enhanced sulfur doped graphdiyne nanozymes for synergistic ferroptosis–apoptosis anticancer therapyPiezoelectric properties of S-GDY. The amplitude map (A), phase diagram (B) amplitude butterfly loop (C) and phase lag loop of S-GDY (D). Note: The red and gray lines represent a cycle of voltage changes, with the red line from positive to negative pressure and the gray line from negative to positive pressureBack to article page