Abstract In this study, a simple chemical precipitation method was used to synthesize ZnO: Co2+ as nanoparticles. The solution casting technique was used for the preparation of polymer films of Carboxymethyl cellulose (CMC) doped with different contents (0.5, 1.5, 3, and 5 wt%) of ZnO/Co NPs. As shown by the X-ray diffraction, the average size of ZnO/Co crystallite of the NPs is 25.6 nm. Meanwhile, the addition of ZnO/Co reduced the semi-crystallinity of CMC. The Fourier transform infrared (FTIR) confirmed the interaction between the ZnO/Co NPs and the polymer CMC. The direct and indirect band gap (Eg) was reduced from (5.32–5.01 eV and 5.20 to 4.99 eV respectively) with the increase in ZnO/Co NPs content up to 3 wt% after this content the Eg is increased as shown by the UV–Vis spectra. In addition, the results of TGA displayed the decomposition of the nanocomposite to be little compared to that of the pure CMC indicating the success of fabrication of products. The improvement of the ionic conductivity was noticed upon the addition of ZnO/Co NPs into the polymer CMC system which can be explained in terms of an increase in amorphicity as shown by the impedance spectroscopic study. It was found that the optimum ionic conductivity (3.209 × 10−6 Scm−1) at ambient temperature was higher for the sample containing 1.5 wt% ZnO/Co NPs with highest of amorphicity and the lowest total loss of weight. Therefore, the improvements in optical properties, thermal stability, and AC conductivity which were observed represent a strong support for the use of the nanocomposite films in the solid state battery applications.

中文翻译：

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用于固态电池应用的 Co/ZnO 纳米颗粒掺杂 CMC 聚合物的结构、热、光学和电导率研究

摘要 本研究采用简单的化学沉淀法合成纳米ZnO:Co2+。溶液浇铸技术用于制备掺杂不同含量（0.5、1.5、3 和 5 wt%）ZnO/Co NPs 的羧甲基纤维素 (CMC) 聚合物薄膜。如 X 射线衍射所示，纳米颗粒的 ZnO/Co 微晶的平均尺寸为 25.6 nm。同时，ZnO/Co的加入降低了CMC的半结晶度。傅里叶变换红外光谱 (FTIR) 证实了 ZnO/Co NPs 与聚合物 CMC 之间的相互作用。直接和间接带隙（Eg）从（分别为 5.32–5.01 eV 和 5.20 到 4.99 eV）随着 ZnO/Co NPs 含量增加至 3 wt%，在该含量后 Eg 增加，如 UV 所示– 可见光谱。此外，TGA 的结果表明，与纯 CMC 相比，纳米复合材料的分解很小，表明产品制造成功。将 ZnO/Co NPs 添加到聚合物 CMC 系统后，离子电导率的提高被注意到，这可以通过阻抗光谱研究显示的非晶性增加来解释。发现在环境温度下，含有 1.5 wt% ZnO/Co NPs 的样品的最佳离子电导率 (3.209 × 10-6 Scm-1) 更高，具有最高的非晶性和最低的总重量损失。因此，观察到的光学性能、热稳定性和交流电导率的改进代表了对纳米复合膜在固态电池应用中的使用的有力支持。