一种用于压电传感器的柔性电极的制备及其性能研究

Preparation and properties of a flexible electrode for the piezoelectric sensor

以化学交联法制备的交联壳聚糖季铵盐为柔性基底,经微拉伸后在其上刷涂PEDOT:PSS导电液制备成柔性电极,再与自制的PVDF-TrFE/ZnO量子点复合压电薄膜贴合组装成全柔性压电传感器件。利用准静态d33测试仪对压电薄膜的压电应变常数d33进行测试,利用万能拉伸机、万用表测试柔性电极的力学性能和导电性能,利用激振器试验对压电传感器的输出性能进行测试。结果表明,交联壳聚糖季铵盐/PEDOT:PSS柔性电极的拉伸强度为3.3 MPa,断裂伸长率为762.3%;经微拉伸-刷涂法制备的柔性电极的电阻为1.68 kΩ;自制旋涂层数为二层的PVDF-TrFE/ZnO薄膜的d33压电常数为26.1 pC/N,与柔性电极组装成的全柔性压电传感器输出电压为4.46 V。

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 kΩ.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.