The optical properties of Makrofol samples are investigated under various fluences of alpha exposure (2 MeV at , , , , , , and alphas.cm alongside the unirradiated ones (pristine). Several analyses, including UV–visible, diffused reflectance spectroscopy (DRS), photoluminescence (PL), Fourier transform infrared/attenuated total reflectance (FTIR-ATR), X-ray photoelectron spectroscopy (XPS) and sessile drop technique, are carried out to reveal the subsequent variations in the optical features of the irradiated polymer foils. The optical transmittance of the irradiated samples notably increases against the pristine ones, while it undergoes a+ plateau over various fluences. Additionally, the scattering events are more prominent in pristine samples over UV (240–400 nm) and IR (900–1040 nm) compared to the irradiated ones. While there are negligible physical alterations on the polymer surface, the photoluminescence emission gradually decreases with increasing alpha fluences in the irradiated samples mainly due to the reduction in the population of the aromatic rings. The latter is also verified by means of the surface chemical analyses such as XPS, FTIR-ATR and sessile drop/contact angle measurements. XPS reveals that the alpha particles give rise to the successive scissions of C–C and CO bonds and the consequent recombination events in the form of C–O bonds, evidenced by the changes in their abundance percentages. Concurrently, the surface hydrophilicity initially elevates up to a certain fluence and then reduces at higher fluences, indicating a couple of competitive mechanisms are involved in the context of the interactions of the alpha particles with the Makrofol polycarbonate (PC).

中文翻译：

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Makrofol 在不同 α 能量密度下的光学特性


Makrofol 样品的光学特性在不同的 α 曝光影响下进行了研究（2 MeV at 、 、 、 、 、 、 和 alphas.cm 以及未辐照样品（原始）。多种分析，包括紫外可见光、漫反射光谱 (DRS) 、光致发光（PL）、傅里叶变换红外/衰减全反射（FTIR-ATR）、X射线光电子能谱（XPS）和座滴技术，以揭示辐照聚合物箔光学特征的后续变化。与原始样品相比，经过辐照的样品的光学透射率显着增加，同时在各种能量密度下经历了 a+ 平台期。此外，原始样品在紫外（240-400 nm）和红外（900-1040 nm）范围内的散射事件更为突出。与辐照样品相比，虽然聚合物表面的物理变化可以忽略不计，但随着辐照样品中α通量的增加，光致发光逐渐减少，这主要是由于芳环数量的减少。后者还通过表面化学分析（例如 XPS、FTIR-ATR 和坐滴/接触角测量）进行验证。 XPS 揭示，α 粒子引起 C-C 和 CO 键的连续断裂，以及随后以 C-O 键形式的重组事件，其丰度百分比的变化证明了这一点。同时，表面亲水性最初升高到一定的注量，然后在较高注量时降低，这表明在 α 粒子与 Makrofol 聚碳酸酯 (PC) 相互作用的背景下涉及多种竞争机制。