制备了性能优越的三元无铅钛酸钡/炭黑/PDMS(BaTiO3/C/PDMS)压电复合薄膜.周期振动击打下BaTiO3/C/PDMS压电复合薄膜输出电压为7.43 V,比BaTiO3/PDMS压电复合薄膜的输出电压增加了143％.当导电材料C的质量分数为3.2 wt％时,BaTiO3/C/PDMS复合薄膜可获得最大输出电压,且压电性能和铁电性能最优.复合薄膜产生的电能可储存至超级电容器,用于驱动对应的商用发光二极管.将BaTiO3/PDMS和BaTiO3/C/PDMS基复合压电材料分别应用于非对称振动能量采集器,实验结果表明系统的-3 dB带宽由未填充C时的8.7 Hz增加到填充C后的9.3 Hz.
Research on Barium Titanate/Carbon Blacks/PDMS Ternary Piezoelectric Composite Film and its Application in Vibration Energy Harvester
The superior performance BaTiO3/C/PDMS lead-free piezoelectric composite films have been fabricated. The synthesized Ba-TiO3/C/PDMS composite nanogenerator exhibits an output voltage of approximately 7. 43 V with periodical beating from a vibrator, which is increased by 143％ compared with the piezoelectric nanogenerators without C mixture. The maximum output voltage of BaTiO3/C/PDMS composite films can be obtained,when the C content of composite is 3.2 wt％,and the piezoelectric and ferroelectric properties are the best. The generated electric energy can be effectively stored by the energy storage capacitor and is successfully used to light a commercial red light-emitting diode( LED) . Moreover,the unsymmetrical vibration energy harvesters with BaTiO3/PDMS and BaTiO3/C/PDMS piezoelectric materials have been fabricated and the values of-3 dB bandwidth of harvesters increase from 8.7 Hz( without C) to 9.3 Hz( with C) .
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