Nanocomposite films of polymethylmethacrylate PMMA with Sn_0.75Fe_0.25S₂ nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Changes in PMMA/Sn_0.75Fe_0.25S₂ nanocomposite (NCP) due to gamma irradiation have been measured. XRD results indicate that the gamma doses of 10–80 kGy cause intermolecular crosslinking that reduces the ordered portion in the NPs. Bonding between the NPs and the host PMMA was confirmed by FTIR. TGA results indicate an enhancement in thermal stability in the NCP films irradiated with doses 20–80 kGy. The optical band gap was reduced from 3.23 to 2.47 eV upon gamma irradiation up to 80 kGy due bonding between the NPs and PMMA which enhanced the amorphous part of the NPs. Finally, the color variation between the blank and irradiated films (ΔE) was determined. Color changes immensely when the PMMA/Sn_0.75Fe_0.25S₂ NCP films are gamma irradiated. Values of ΔE were as much as 31.6 which is an acceptable match in commercial reproduction on printing presses.

中文翻译：

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γ射线对PMMA / Sn0.75Fe0.25S2纳米复合材料的结构，热学和光学性质的影响

通过热解和流延技术制备了具有Sn _0.75 Fe _0.25 S ₂纳米颗粒（NPs）的聚甲基丙烯酸甲酯PMMA纳米复合膜。PMMA / Sn _0.75 Fe _0.25 S _2的变化已经测量了由于伽马射线辐射引起的纳米复合材料（NCP）。XRD结果表明，γ剂量为10–80 kGy会引起分子间交联，从而减少NP中的有序部分。FTIR证实了NP与主体PMMA之间的键合。TGA结果表明，辐照剂量为20–80 kGy的NCP薄膜的热稳定性有所增强。由于NP和PMMA之间的键合增强了NP的非晶部分，在伽马射线辐照下，光学带隙从3.23 eV减小到2.47 eV，直至80 kGy。最后，确定空白膜和被辐照膜之间的颜色变化（ΔE）。当PMMA / Sn _0.75 Fe _0.25 S ₂时颜色会发生巨大变化NCP膜经过伽马射线辐照。ΔE的值高达31.6，这在印刷机的商业复制中是可以接受的匹配。