Talemi Pejman, Delaigue Marine, Murphy Peter, Fabretto Manrico
†Thin Film Coatings Group, Mawson Institute, University of South Australia, Mawson Lakes, 5095 South Australia, Australia.
‡Department of Chemistry, University of Adelaide, Adelaide, 5001 South Australia, Australia.
ACS Appl Mater Interfaces. 2015 Apr 29;7(16):8465-71. doi: 10.1021/am5089082. Epub 2015 Apr 16.
An all polymer piezo/pyroelectric device was fabricated using β phase poly(vinylidene fluoride) (PVDF) as the active material and vapor phase polymerized (VPP) poly(3,4-ethylenedioxythiphene) (PEDOT) as the flexible electrode overlay material. Inherent problems usually associated with coating polymeric electrodes onto the low surface energy PVDF were overcome by air plasma treating the film in conjunction with utilizing the VPP technique to simultaneously synthesize and in situ deposit the PEDOT electrode. Strain measurements up to the breaking-strain of PVDF (approximately 35%) indicated that the change in R/Ro was significantly smaller for the PEDOT based electrodes compared to the platinum electrode. Plasma treatment of the PVDF film increased the level of surface oxygenated carbon species that contributed to increased surface energy, as confirmed by confirmed by contact angle measurement. The enhanced adhesion between the two polymers layers contributed to a significant increase in the measured piezoelectric output voltage from 0.2 to 0.5 V for the same strain conditions. Pyroelectric voltage outputs were obtained by placing the film onto and off of a hotplate, for temperatures up to 50 °C above ambient. Finally, as a proof of concept, a simple energy harvesting device (plastic tube with slots for mounting multiple piezo/pyro films) was fabricated. The device was able to generate a usable level of peak output current (>3.5 μA) from human inhalation and exhalation "waste energy".
一种全聚合物压电/热电器件是使用β相聚偏二氟乙烯（PVDF）作为活性材料，并采用气相聚合（VPP）的聚（3,4 - 乙撑二氧噻吩）（PEDOT）作为柔性电极覆盖材料制成的。通过对薄膜进行空气等离子体处理，并结合利用VPP技术同时合成和原位沉积PEDOT电极，克服了通常与在低表面能PVDF上涂覆聚合物电极相关的固有问题。高达PVDF断裂应变（约35%）的应变测量表明，与铂电极相比，基于PEDOT的电极的R/Ro变化明显更小。通过接触角测量证实，PVDF薄膜的等离子体处理增加了表面含氧碳物种的水平，这有助于提高表面能。在相同应变条件下，两层聚合物之间增强的附着力导致测量的压电输出电压从0.2 V显著增加到0.5 V。通过将薄膜放置在热板上和从热板上取下，在比环境温度高50°C的温度下获得热释电电压输出。最后，作为概念验证，制造了一个简单的能量收集装置（带有用于安装多个压电/热释电薄膜的插槽的塑料管）。该装置能够从人类吸入和呼出的“废能”中产生可用水平的峰值输出电流（>3.5 μA）。
