Preparation and properties of a flexible electrode for the piezoelectric sensor.

The quaternary ammonium salt of crosslinked chitosan prepared by chemical crosslinking method was used as the flexible substrate. After micro-stretching, PEDOT: PSS was brushed on it to prepare the flexible electrode. Further, the flexible piezoelectric sensor was obtained by assembling the flexible electrode with the self-made PVDF-TrFE/ZnO quantum dot composite piezoelectric film. The quasi-static d33 tester was used to test the piezoelectric strain constant of the piezoelectric film, and the mechanical and electrical properties of the flexible electrode were tested by universal tensile testing machine and multimeter, respectively. The output performance of the piezoelectric sensor was tested by excitor test. The results show that the tensile strength of flexible electrode was 3.3 MPa and the elongation at break was 762.3%. The resistance of flexible electrode was 1.68 Ω H. The d33 piezoelectric constant of PVDF-TrFE /ZnO film with two layers of spin coating was 26.1 pC/N. The output voltage of the fully flexible piezoelectric sensor was 4.46 V. [ABSTRACT FROM AUTHOR]