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首页> 美国卫生研究院文献>Polymers >Assessment of the Irradiation Exposure of PET Film with Swift Heavy Ions Using the Interference-Free Transmission UV-Vis Transmission Spectra
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Assessment of the Irradiation Exposure of PET Film with Swift Heavy Ions Using the Interference-Free Transmission UV-Vis Transmission Spectra

机译：使用无干扰透射型UV-VIS透射光谱评估PET膜的辐射膜的辐照暴露

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This paper presents the results of a study of polyethylene terephthalate (PET) films irradiated with Ar and Kr ions at both normal orientation and an angle of 40° to the normal. Normal irradiation was performed using Ar8+ and Kr15+ ions with an energy of 1.75 MeV/au and fluences in the range (2–500) × 1010 cm−2 for Ar8+ ions and (1.6 − 6.5) × 1010 cm−2 for Kr15+ ions. Kr ions with an energy of 1.2 MeV/au and charges of 13+, 14+, and 15+ were used for angled irradiation. For each Kr ion charge value, three fluence values were used: 5 × 1010, 1 × 1011, and 2.5 × 1011 cm−2. It is well known that irradiation of PET films by swift heavy ions results in a red shift of the UV-vis transmission spectra absorption edge. The experimental transmission spectra exhibit well-defined interference fringes, which obscure the underlying transmission response. Using an existing technique to obtain interference-free transmission curves Tα(λ) for both pristine and irradiated PET film samples, we found that S, the total radiation-induced absorption of light by the PET film, is proportional to the logarithm of the fluence F. In addition to this dependence on the irradiating fluence, we also found that the charge of the irradiating ion has a significant influence on the position of the absorption edge in the UV-vis spectra. This provides experimentally independent evidence to confirm our previous results showing that ion charge has an effect on the post-irradiation state of PET films. We present a physical interpretation of the observed absorption edge red shift in irradiated PET films as being due to the growth of extended conjugated systems via the formation of intermolecular helical structures. Our investigations into the stability of irradiation-induced effects in PET films show that comparison of UV-vis transmission spectra before and after annealing can provide information about the structure of deep traps in PET.
机译：本文介绍了在正常取向下用Ar和Kr离子照射的聚对苯二甲酸乙二醇酯（PET）膜的研究结果，并且在正常的角度下为40°。使用AR8 +和KR15 +离子进行正常辐射，其能量为1.75meV / Au，并且在Ar8 +离子的范围（2-500）×1010cm-2的范围内（2-500）×1010cm-2，并且用于KR15 +离子的（1.6-6.5）×1010cm-2。具有1.2meV / Au的能量的Kr离子和13+，14 +和15+的电荷用于成角度的照射。对于每个KR离子电荷值，使用三种注重量：5×1010,1×1011和2.5×1011cm-2。众所周知，SWIFT重离子的PET膜照射导致UV-VIS透射谱吸收边缘的红色移位。实验透射光谱表现出明确定义的干涉条纹，其模糊了潜在的传输响应。使用现有技术获得用于原始和照射的PET膜样品的无干扰传输曲线Tα（λ），我们发现S，通过PET膜的总辐射引起的光吸收，与流量的对数成比例F.除了对照射注量的依赖性外，还发现，照射离子的电荷对UV-Vis光谱中的吸收边缘的位置具有显着影响。这提供了通过实验独立的证据来确认我们以前的结果，表明离子电荷对PET薄膜的照射后状态有影响。我们介绍了辐照PET薄膜中观察到的吸收边缘红移的物理解释，因为通过形成分子间螺旋结构的扩展缀合系统的生长。我们对PET薄膜中辐射诱导的效果的稳定性的研究表明，退火前后UV-VIS透射谱的比较可以提供关于PET中深陷阱结构的信息。

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