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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/cm~2,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。
Polyvinylidene fluoride (PVDF) with high conductivity was prepared by 248 nm KrF excimer laser irradiation. The conductivity of PVDF after laser irradiation changed permanently. The results of X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) showed that the photochemical reaction occurred only on the surface of the sample. The laser photons caused the surface microstructure to mutate and generate HF gas with high stability and high Uniformity of the conductive layer. By analyzing the experimental results of different surface conductivities obtained under different laser energy densities, the energy density range of the surface modification obtained by excimer laser is 44 ~ 112 mJ / cm ~ 2. The modified surface conductivity Which is 9 ~ 12 orders of magnitude higher than that of 10 ~ (-1) Ω ~ (-1) · cm ~ (-1), up to 10 ~ (-1) Ω ~ (-1) · cm ~ -1). The formation of conductive layer was found in the experiment, and the surface conductive activity mechanism was discussed preliminarily.