Abstract In this paper, silver (Ag) nanoparticles were synthesized by utilizing an aqueous extract of fresh leaves of Chenopodium murale which is considered a cost-effective and eco-friendly approach. The sol-gel technique was used to syntheses TiO2 nanoparticles and different methods were used to characterize the nanoparticles (Ag and TiO2) including UV–Vis spectroscopy, XRD, and TEM. Also, new nanocomposites were prepared using the solution casting method. The prepared films were characterized by different analytical methods. The absorption peak of the silver nanoparticles shown by the UV–visible spectrum was around 430 nm. The crystalline average size of the Ag NPs was 20 nm while TiO2 NPs was 15 nm as displayed by the XRD pattern. Meanwhile, the degree of amorphicity of the Cs/PEO blend was increased as a result of adding Ag and TiO2 NPs. It was evident through the FTIR spectroscopy that there was an interaction between the functional groups of the polymer blend and the Ag/TiO2 nanofiller. In addition, there was an increase of mechanical properties of the prepared films such as the Young's modulus, elongation, and tensile strength with increasing the Ag/TiO2 content. It was clear through the impedance spectroscopic study that the iconic conductivity was improved with the addition of Ag and TiO2 nanoparticles into the polymer blend system. The highest conductivity was log −9.34 S cm−1 at Cs/PEO/0.3%Ag/0.8%TiO2. It was also evident from the results that the antibacterial activity of the pure Cs/PEO blend was increased as a result of doping Ag/TiO2 nanoparticles to the polymer blend. The activity index (%) of the antibacterial activity at sample blend + (0.3%) Ag + (0.8%) TiO2 of the E. coli, S. aureus, C. Albicans, A. niger was 32, 45.8, 77.8, and 92 (%) respectively. Thus, these results indicate the applicability and potential of the nanocomposites for use in food packaging applications.

中文翻译：

---

用于食品包装应用的 Cs/PEO 掺杂混合纳米粒子 (Ag/TiO2) 的增强结构、电学、机械性能和抗菌活性

摘要 在本文中，银 (Ag) 纳米粒子通过利用藜新鲜叶的水提取物合成，被认为是一种经济高效且环保的方法。溶胶-凝胶技术用于合成 TiO2 纳米颗粒，并使用不同的方法来表征纳米颗粒（Ag 和 TiO2），包括 UV-Vis 光谱、XRD 和 TEM。此外，使用溶液浇铸方法制备了新的纳米复合材料。制备的薄膜通过不同的分析方法进行表征。紫外可见光谱显示的银纳米颗粒的吸收峰约为 430 nm。Ag NPs 的晶体平均尺寸为 20 nm，而 TiO2 NPs 的晶体平均尺寸为 15 nm，如 XRD 图案所示。同时，由于添加了 Ag 和 TiO2 NPs，Cs/PEO 混合物的非晶性程度增加。通过 FTIR 光谱可以明显看出，聚合物共混物的官能团与 Ag/TiO2 纳米填料之间存在相互作用。此外，随着Ag/TiO2含量的增加，制备的薄膜的力学性能如杨氏模量、伸长率和拉伸强度均有所提高。通过阻抗光谱研究可以清楚地看出，在聚合物共混体系中添加 Ag 和 TiO2 纳米粒子后，标志性的电导率得到了改善。在 Cs/PEO/0.3%Ag/0.8%TiO2 下，最高电导率为 log -9.34 S cm-1。结果还表明，由于将 Ag/TiO2 纳米粒子掺杂到聚合物共混物中，纯 Cs/PEO 共混物的抗菌活性增加。样品混合物的抗菌活性指数 (%) + (0.3%) Ag + (0. 8%) 大肠杆菌、金黄色葡萄球菌、白色念珠菌、黑曲霉的 TiO2 分别为 32、45.8、77.8 和 92 (%)。因此，这些结果表明纳米复合材料在食品包装应用中的适用性和潜力。