Kumar Shalendra, Ahmed Faheem, Ahmad Naushad, Shaalan Nagih M, Kumar Rajesh, Alshoaibi Adil, Arshi Nishat, Dalela Saurabh, Alvi Parvez Ahmad, Kumari Kavita
Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia.
Department of Physics, University of Petroleum & Energy Studies, Dehradun 248007, India.
Materials (Basel). 2022 Jun 9;15(12):4119. doi: 10.3390/ma15124119.
The nanoparticles of CeO, CeFeO, and CeFeCuO were synthesized using the co-precipitation-synthesis technique. The effect of co-doping of Fe and Cu on structural, optical, and magnetic properties as well as specific capacitance have been studied using X-ray diffraction (XRD), scanning-electron microscopy (SEM), UV-visible spectroscopy, Raman spectroscopy, dc magnetization, and electrochemical measurements at room temperature. The results of the XRD analysis infer that all the samples have a single-phase nature and exclude the formation of any extra phase. Particle size has been found to reduce as a result of doping and co-doping. The smallest particle size was obtained to be 5.59 nm for CeFeCuO. The particles show a spherical-shape morphology. Raman active modes, corresponding to CeO, were observed in the Raman spectra, with noticeable shifting with doping and co-doping indicating the presence of defect states. The bandgap, calculated using UV-Vis spectroscopy, showed relatively low bandgap energy (1.7 eV). The dc magnetization results indicate the enhancement of the magnetic moment in the samples, with doping and co-doping. The highest value of saturation magnetization (1.3 × 10 emu/g) has been found for CeFeCuO nanoparticles. The electrochemical behavior studied using cyclic-voltammetry (CV) measurements showed that the CeFeO electrode exhibits superior-specific capacitance (~532 F g) along with capacitance retention of ~94% for 1000 cycles.
采用共沉淀合成技术合成了CeO、CeFeO和CeFeCuO纳米颗粒。利用X射线衍射（XRD）、扫描电子显微镜（SEM）、紫外可见光谱、拉曼光谱、直流磁化强度和室温下的电化学测量，研究了Fe和Cu共掺杂对结构、光学、磁性以及比电容的影响。XRD分析结果表明，所有样品均为单相性质，排除了任何额外相的形成。由于掺杂和共掺杂，发现粒径减小。CeFeCuO的最小粒径为5.59 nm。颗粒呈现球形形态。在拉曼光谱中观察到与CeO相对应的拉曼活性模式，随着掺杂和共掺杂出现明显的位移，表明存在缺陷态。利用紫外可见光谱计算得到的带隙显示出相对较低的带隙能量（1.7 eV）。直流磁化强度结果表明，随着掺杂和共掺杂，样品中的磁矩增强。CeFeCuO纳米颗粒的饱和磁化强度最高值为1.3×10 emu/g。使用循环伏安法（CV）测量研究的电化学行为表明，CeFeO电极表现出优异的比电容（~532 F/g），并且在1000次循环中电容保持率约为94%。
