| Autor: |
Kumar S; 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., Ahmed F; Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia., Ahmad N; Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia., Shaalan NM; Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia.; Physics Department, Faculty of Science, Assiut University, Assiut 71516, Egypt., Kumar R; University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, New Delhi 110078, India., Alshoaibi A; Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia., Arshi N; Department of Basic Sciences, Preparatory Year Deanship, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia., Dalela S; Department of Pure & Applied Physics, University of Kota, Kota 324005, India., Alvi PA; Department of Physics, Banasthali Vidyapith, Banasthali 304022, India., Kumari K; School of Materials Science and Engineering, Changwon National University, Changwon 51140, Gyeongnam, Korea. |
| Abstrakt: |
The nanoparticles of CeO 2 , Ce 0.98 Fe 0.02 O 2 , and Ce 0.78 Fe 0.02 Cu 0.20 O 2 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 Ce 0.78 Fe 0.02 Cu 0.20 O 2 . The particles show a spherical-shape morphology. Raman active modes, corresponding to CeO 2 , 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 -2 emu/g) has been found for Ce 0.78 Fe 0.02 Cu 0.20 O 2 nanoparticles. The electrochemical behavior studied using cyclic-voltammetry (CV) measurements showed that the Ce 0.98 Fe 0.02 O 2 electrode exhibits superior-specific capacitance (~532 F g -1 ) along with capacitance retention of ~94% for 1000 cycles. |
