The size dependency of nanostructures such as nanoparticles, nanorods, nanotubes, etc., plays a vital role in various device applications. Compared to bulk state, nano scale materials possess enhanced physico-chemical properties. The present research involves the synthesis of pure and cobalt (Co)–nickel (Ni) co-doped (2 and 4 wt%) zinc oxide (ZnO) nanorods (NRs) using co-precipitation method. The primary objective of the study is to examine the impact of co-dopant on structural, optical, morphological, and dielectric properties of ZnO NRs. PXRD analysis demonstrated a increase in crystallite size (D) and decrease in dislocation density (δ), and stress (σ) as the concentration of Co-Ni co-dopants increased in pure ZnO. Optical studies reveal a reduction in band gap energy with an increased Co-Ni concentration. Additionally, in morphological studies, an increase in the width of pure ZnO nanorods was observed with higher dopant concentration. The dielectric measurements revealed that the Co - Ni co-doped ZnO nanostructures exhibited significantly enhanced electrical conductivity and dielectric constant due to increased number of charge carriers and variations in the electronegativities of Co, Ni, and Zn. These findings make them highly promising materials for optoelectronic device applications.

中文翻译：

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Co和Ni浓度对ZnO纳米棒结构、紫外透明度和电学行为的影响

纳米结构（例如纳米颗粒、纳米棒、纳米管等）的尺寸依赖性在各种器件应用中起着至关重要的作用。与块状材料相比，纳米级材料具有增强的物理化学性质。目前的研究涉及使用共沉淀法合成纯氧化锌（Co）-镍（Ni）共掺杂（2 和 4 wt%）氧化锌（ZnO）纳米棒（NR）。该研究的主要目的是研究共掺杂剂对 ZnO NR 的结构、光学、形态和介电性能的影响。PXRD 分析表明，随着纯 ZnO 中 Co-Ni 共掺杂剂浓度的增加，微晶尺寸 (D) 增加，位错密度 (δ) 和应力 (σ) 减少。光学研究表明，随着 Co-Ni 浓度的增加，带隙能量会降低。此外，在形态学研究中，观察到掺杂浓度较高时纯 ZnO 纳米棒的宽度增加。介电测量表明，Co-Ni 共掺杂 ZnO 纳米结构由于电荷载流子数量的增加以及 Co、Ni 和 Zn 电负性的变化而表现出显着增强的电导率和介电常数。这些发现使它们成为光电器件应用中极具前景的材料。