Poly(vinylidene fluoride) (PVDF), an organic piezoelectric polymer, has been extensively studied for application in flexible pressure sensors. In order to obtain a sufficient voltage output from PVDF-based pressure sensors, a poling treatment of PVDF films is necessary. Conventional poling methods generally require the application of a considerably high electric field and high annealing temperatures, which lead to an increase in the cost of sensor fabrication. Herein, we propose a method for the formation of poled PVDF films by drop-casting a PVDF-dissolved polar solution onto chemically modified electrodes and subsequent drying of the dropped solution. The PVDF-based pressure sensors in which the underlying gold (Au) electrode was modified with a thiol reagent, 1H,1H,2H,2H-Perfluorodecanethiol (PFDT), exhibited a remarkably high pressure sensitivity, while negligible sensitivity was achieved without surface modification. It was demonstrated that surface chemical modification aligns the direction of the surface dipoles. The proposed method is advantageous for controlling the polarization of PVDF films on electrode surfaces.

聚偏二氟乙烯（PVDF）是一种有机压电聚合物，已经广泛研究了其在柔性压力传感器中的应用。为了从基于PVDF的压力传感器获得足够的电压输出，必须对PVDF膜进行极化处理。常规的极化方法通常需要施加相当高的电场和较高的退火温度，这导致传感器制造成本的增加。在本文中，我们提出了一种通过将溶解有PVDF的极性溶液滴铸到化学修饰的电极上并随后干燥所滴下的溶液来形成极化PVDF膜的方法。基于PVDF的压力传感器，其中的下层金（Au）电极用硫醇试剂1 H，1 H，2 H修饰，2 H-全氟癸烷硫醇（PFDT）表现出极高的压力敏感性，而无需进行表面改性即可获得可忽略不计的敏感性。已证明表面化学改性使表面偶极子的方向对齐。所提出的方法对于控制电极表面上的PVDF膜的极化是有利的。