Influence of UV-Irradiation on Latent Tracks in Polyethylene Terephthalate Films  

作　　者：文琪 王鹏飞 凌云 汪茂 闫东晓 曹兴忠 王宝义 王宇钢 

机构地区：[1]State Key Laboratory of Nut/ear Physics and Technology, Peking University, Beijing 100871 [2]Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049

出　　处：《Chinese Physics Letters》2016年第1期100-103,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11335003 and 91323105

摘　　要：Polyethylene terephthalate （PET） films in thickness of 12 μm are irradiated by Xe and Au ions at the energies of 9.5 and 11.4MeV/u and with the ion fluence from 5 × 10^9 cm^-2 to 1×10^11 cm^-2. After irradiation, ultra-violet lights are used to illuminate the samples with latent tracks at the wavelength of 365nm with flux density of 4.2mW/cm^-2. UV-irradiation effects on tracked PET are investigated by the UV-vis spectrum and positron annihilation lifetime spectroscopy （PALS）. It is found that carbonaceous clusters in PET films are generated by ion irradiation and decomposed with UV illumination by calculating the optical energy band gap Eg in the UV-vis spectrum. The free volumes behave differently in track and bulk after UV illumination. In our experiment, the PALS results show an increase in radius and density of free volume in tracked PET films after UV treatment, which indicates an expansion in radius of latent tracks.Polyethylene terephthalate （PET） films in thickness of 12 μm are irradiated by Xe and Au ions at the energies of 9.5 and 11.4MeV/u and with the ion fluence from 5 × 10^9 cm^-2 to 1×10^11 cm^-2. After irradiation, ultra-violet lights are used to illuminate the samples with latent tracks at the wavelength of 365nm with flux density of 4.2mW/cm^-2. UV-irradiation effects on tracked PET are investigated by the UV-vis spectrum and positron annihilation lifetime spectroscopy （PALS）. It is found that carbonaceous clusters in PET films are generated by ion irradiation and decomposed with UV illumination by calculating the optical energy band gap Eg in the UV-vis spectrum. The free volumes behave differently in track and bulk after UV illumination. In our experiment, the PALS results show an increase in radius and density of free volume in tracked PET films after UV treatment, which indicates an expansion in radius of latent tracks.

关 键 词：of in UV that PET on been IS 

分 类 号：O484.4[理学—固体物理]