基于BaTiO3/MWCNT复合压电-摩擦薄膜的制备及测试∗

摘要

The composite piezoelectric-triboelectric films were prepared by using the inverting mold process and polarized.The PDMS mixture,incorporated with BaTiO3 nanoparticles and MWCNTs,was uniformly coated on the surface of the silicon mold with an array of pyramid micro-structures and heated before the film was made. SEM and Raman spectroscopy were used to observe and analyze the surface and internal structures of the film and its components.Testing system for vibration energy harvesting was designed to measure and analyze output voltage of the film and its power supply capacity.The results showed that the array of pyramid structures on the surface of the piezoelectric-triboelectric film had a high degree of consistency.A small BaTiO3/MWCNT content was relatively evenly distributed in the film and BaTiO3 nanoparticles were the tetragonal phase.The peak to peak value of output voltage generated by the piezoelectric-triboelectric film was even higher than the sum of the peak to peak values of output voltages generated by the piezoelectric and triboelectric films.The vibration ener-gy harvester made of the piezoelectric-triboelectric film with an area of approximately 5×10-4 m2 was capable of lighting up at least one commercial LED.%利用倒模工艺,在PDMS混合液中掺入Ba-TiO3纳米颗粒和 MWCNTs,并将混合物均匀涂敷于带有微米级金字塔型阵列结构的硅模表面,加热制得复合压电-摩擦薄膜,并对薄膜进行极化处理。分别运用SEM和Raman光谱仪观察分析薄膜表面和内部结构及其组分。设计振动能量采集测试系统测量分析薄膜的输出电压和供电能力。实验结果表明,压电-摩擦薄膜表面的金字塔型阵列结构具有高度的一致性,薄膜内部BaTiO3和MWCNTs 含量相对较少,分布相对均匀,且其中 BaTiO3纳米颗粒为四方相。压电-摩擦薄膜的输出电压峰-峰值比单一压电和摩擦薄膜的输出电压峰-峰值之和还要高,面积约为5×10－4 m2的压电-摩擦薄膜制成的振动能量采集器能够点亮至少1个商用LED灯。