高能Ar离子辐照PET引起的光吸收变化研究

采用紫外–可见光吸收技术分析和研究了35MeV/uAr离子辐照聚酯膜引起的光吸收改性.结果表明,Ar离子轰击聚酯膜时引起了碳键的共轭体系形成,从而导致了紫外–可见光区域中光吸收明显增加,光吸收增加的幅度依赖于离子的照射剂量、离子在样品中的平均电子能量损失以及光的波长,剂量越高,电子能损越大,光吸收增幅越大;而光的波长越长,光吸收的增加则越不明显.利用测量到的光吸收曲线,同时还定量地研究了各种辐照条件下聚酯膜的光能隙和碳原子团的尺寸.

Modifications in Optical Absorption of PET Films by High Energy Ar Ion Irradiation

Modifications in optical absorption of polyethylene terephthalate(PET) films induced by 35MeV/u Ar ion irradiation were studied by means of ultraviolet-visible absorption spectroscopy.A strong increase in absorbance in the ultraviolet and visible regions is observed in the irradiated samples, which is attributed to the formation of a conjugated system of carbon bonds.The effect is found to increase with increase of ion fluence and the mean electronic energy loss in the samples,but to decrease with increase in the optical wavelength.According to the measured optical absorption spectra,modifications of optical energy gap and the mean size of carbon clusters of the PET samples under irradiation are also analyzed and discussed.