fig3
From: Challenges and progress of chemical modification in piezoelectric composites and their applications

Figure 3. Chemically modified piezoelectric materials. (A) Cationic-substitution-modified ceramics; (B) the direct terpolymerization scheme of VDF, TrFE and CTFE[41]. Copyright 2022, American Chemical Society; (C) reaction scheme of P(VDF-TrFE-CFE) treated with triethylamine[46]. Copyright 2022, American Association for the Advancement of Science.