采用248 nm KrF准分子激光辐照方法,制备具有高导电活性的聚偏氟乙烯(PVDF)材料,激光辐照后的PVDF表面的电导率发生永久性变化。通过X射线光电子能谱(XPS)和傅里叶变换红外(FTIR)光谱分析表明,光化学反应仅发生在样品表面,激光光子使表面微结构发生突变,产生HF气体,获得了高稳定性及高均匀性的导电层。通过对不同激光能量密度下得到的不同表面电导率的实验结果进行分析计算,得到准分子激光使其表面改性的能量密度范围为44-112 mJ/cm2,改性后的表面电导率比其中性态(10-13 Ω-1·cm-1)上升9-12个数量级,最高达到10-1 Ω-1·cm-1。实验中发现了导电层形成过程,并对其表面导电活性机理进行了初步探讨。

The generation of permanent high-grade conducting layer on the surface of polyvinylidene fluoride (PVDF) was induced by 248 nm KrF excimer laser irradiation. The results of XPS and FTIR spectra indicated that the photochemical reaction was occurred on the surface of samples and the microstructure was changed by laser light to generate HF gas,then resulted in high-stability and high-uniformity conducting layer on the surfaces. After analyzing and calculating the relationship between laser processing parameters and surface conductivity,the laser energy density of 44-112 mJ/cm2 was determined. The conductivity of the changed surfaces was increased to 12 orders of magnitude which reached to 10-1 Ω-1·cm-1. Based on the discovery of conducting layer,the mechanism of electrical conduction on PVDF surface was discussed.