Control on the size of copper oxide (CuO) in the nano range is a highly motivating approach to study its multifunctional nature. The present investigation reports a sol-gel derived Ni doped CuO nanoparticles (Cu_1-xNi_xO). Rietveld refinement of the XRD spectra confirms the formation of single monoclinic phase of Cu_1-xNi_xO nanoparticles having crystallite size within the range of 19–21 nm. Raman spectra show the presence of characteristics Raman active modes and vibrational bands in the Cu_1-xNi_xO samples that corroborate the monoclinic phase of the samples as revealed by refinement of XRD data. The estimated band gap of pure CuO is found to be ∼1.43 eV, which decreases with the increase of dopant concentration into CuO matrix. This result is in line with estimated crystallite size. Magnetization curves confirm the weak ferromagnetic nature of Cu_1-xNi_xO nanoparticles which reveal the DMS phase. This weak magnetic nature may be induced in the samples due to the exchange interaction between the localized magnetic d-spins of Ni ions and carriers (holes or electrons) from the valence band of pristine CuO lattice. Replacement of Cu⁺² by Ni⁺² ions into the host CuO lattice induces the magnetization. The quantified value of squareness ratio (S < 0.5) confirms the inter-grain magnetic interactions in the Cu_1-xNi_xO nanoparticles which is also the reason of weak induced magnetization.

在纳米范围内控制氧化铜 (CuO) 的尺寸是研究其多功能性质的一种高度激励方法。本研究报告了溶胶-凝胶衍生的 Ni 掺杂的 CuO 纳米粒子（Cu _1-x Ni _x O）。XRD 光谱的Rietveld 精修证实了Cu _1-x Ni _x O 纳米颗粒的单斜相的形成，其晶粒尺寸在19-21 nm 范围内。拉曼光谱显示了在 Cu _1-x Ni _{x 中}存在特征拉曼活性模式和振动带O 样品证实了样品的单斜晶相，如通过 XRD 数据的细化所揭示的。发现纯CuO的估计带隙为~1.43 eV，随着CuO基质中掺杂剂浓度的增加而减小。该结果与估计的微晶尺寸一致。磁化曲线证实了显示 DMS 相的 Cu _1-x Ni _x O 纳米颗粒的弱铁磁性质。由于 Ni 离子的局部磁性 d-spin 与来自原始 CuO 晶格价带的载流子（空穴或电子）之间的交换相互作用，样品中可能会产生这种弱磁性。铜的替代⁺²采用Ni ⁺²离子进入宿主 CuO 晶格会引起磁化。矩形比的量化值 (S < 0.5) 证实了 Cu _1-x Ni _x O 纳米颗粒中的晶粒间磁相互作用，这也是弱感应磁化的原因。