Structural, Optical, and Magnetic Properties of Cobalt-Doped ZnAl 2 O 4 Nanosheets Prepared by Hydrothermal Synthesis

Thirumala Rao Gurugubelli, Bathula Babu and Kisoo Yoo
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Thirumala Rao Gurugubelli: Physics Division, Department of Basic Sciences and Humanities, GMR Institute of Technology, GMR Nagar, Rajam 532127, India
Bathula Babu: School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, Korea
Kisoo Yoo: School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, Korea

Energies, 2021, vol. 14, issue 10, 1-9

Abstract: Nanomaterials with collective optical and magnetic properties are called smart or functional materials and have promising applications in many fields of science and technology. Undoped and Co-doped ZnAl 2 O 4 were prepared using a co-precipitation-assisted hydrothermal method. A systematic investigation was carried out to understand the effects of the Co concentration on the crystalline phase, morphology, and optical and magnetic properties of Co-doped ZnAl 2 O 4 . X-ray diffraction confirmed the cubic spinel structure with the Fd3m space group, and there was no impurity phase. X-ray photoelectron spectroscopy of Co-doped ZnAl 2 O 4 confirmed the existence of Zn, Al and O, and the Co in the optimized sample of ZAO-Co-3 confirmed the oxidation state of cobalt as Co 2+ . Transmission electron microscopy of pure and Co-doped ZnAl 2 O 4 revealed micro-hexagons and nanosheets, respectively. The optical absorption results showed that the bandgap of ZnAl 2 O 4 decreased with increasing Co concentration. The hysteresis loop of Co-doped ZnAl 2 O 4 revealed clear ferromagnetic behavior at room temperature. The as-prepared materials are suitable for energy storage applications, such as in supercapacitors and fuel cells. This work aims to focus on the effect of cobalt ions in different concentrations on structural, optical and magnetic properties.

Keywords: ZnAl 2 O 4; cobalt-doping; bandgap; optical; magnetic (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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