This work deals with a green route to fabricate a biocompatible hybrid film composed of silver nanoparticles (AgNPs) and ethyl cellulose (EC). The hybrid film (AgNP/EC), with a thickness of 30 μm, was obtained by synthesizing in situ AgNPs in EC. EC was used as a reducing agent of silver ions and stabilizing agent of AgNPs. The structural, optical, mechanical, and dielectric properties of the AgNP/EC film were characterized; the results were compared to a reference EC film. From transmission electron microscopy (TEM) images, AgNPs of quasi-spherical morphology (average size ~ 1.94 nm) embedded in the EC matrix of the hybrid film were identified. The UV–visible absorbance spectrum of the AgNP/EC film showed three peaks associated with the presence of AgNPs in the EC matrix. Through Fourier transform infrared spectroscopy (FTIR), a band at 1588 cm⁻¹ was assigned to the interaction between carboxyl groups of EC and AgNPs. Compared to the EC film, the mechanical and dielectric dynamic analyses evidenced for the AgNP/EC film an increment of the glass transition temperature and storage elastic modulus. But the dielectric permittivity of AgNP/EC film decreases slightly with respect to EC film. Due to its properties the AgNP/EC film can be considered as an important material with potential applications for the design of sensors and actuators in biological systems.

Graphic abstract

中文翻译：

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基于银纳米颗粒/乙基纤维素聚合物的生物相容性杂化膜的制备和表征

这项工作涉及制造由银纳米粒子 (AgNPs) 和乙基纤维素 (EC) 组成的生物相容性混合膜的绿色途径。通过在 EC 中原位合成 AgNPs 获得厚度为 30 μm 的混合膜 (AgNP/EC)。EC用作银离子的还原剂和AgNPs的稳定剂。表征了 AgNP/EC 薄膜的结构、光学、机械和介电性能；将结果与参考 EC 膜进行比较。从透射电子显微镜 (TEM) 图像中，鉴定出嵌入混合膜的 EC 基质中的准球形形态（平均尺寸 ~ 1.94 nm）的 AgNP。AgNP/EC 薄膜的紫外可见吸收光谱显示出三个与 EC 基质中存在的 AgNP 相关的峰。通过傅里叶变换红外光谱 (FTIR)，在 1588 cm 处有一个波段^-1被指定为 EC 和 AgNPs 的羧基之间的相互作用。与 EC 膜相比，机械和介电动力学分析证明 AgNP/EC 膜的玻璃化转变温度和储能弹性模量有所增加。但是，AgNP/EC 薄膜的介电常数相对于 EC 薄膜略有下降。由于其特性，AgNP/EC 薄膜可以被认为是一种重要的材料，在生物系统中的传感器和执行器的设计中具有潜在的应用。

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