K. N. Ganesha
Department of Physics, Yuvaraja’s College, University of Mysore, Mysuru, Karnataka, 570005, India
SRSMN Govt. First Grade College & PG Study Centre, Barkur, Udupi, Karnataka, 576210, India
H Chandrappa
SRSMN Govt. First Grade College & PG Study Centre, Barkur, Udupi, Karnataka, 576210, India
S R Kumaraswamy
Government First Grade College for Women, Byrapura, T. Narasipura, Mysuru, Karnataka, 571124, India
V Annadurai
Department of Physics, NIE First Grade College, University of Mysore, Mysuru-570008, India
H. Somashekarappa
Department of Physics, Yuvaraja’s College, University of Mysore, Mysuru, Karnataka, 570005, India
R Somashekar
Institution of Excellence, Vijnana Bhavana, Manasagangothri, Mysuru, 570006, India
The calcium-doped ZnO nanoparticles, Zn1-xCaxO (x = 0, 0.025, 0.05, 0.075) were prepared by the solution combustion method. The synthesized nanoparticles were characterized by various techniques such as XRD, FTIR, Raman, FESEM-EDX, PL, Impedance, and UV-Vis. The Rietveld refinement of the X-ray diffractogram yields the crystalline structure and lattice parameters. Also, the XRD analysis shows that the substitution of Ca into ZnO does not alter the Wurtzite structure of ZnO. The crystallite size of the samples, calculated using the Scherer equation, was found to be between 46 nm and 92 nm. FTIR spectra detect the ZnO-related vibration modes of the samples. The FESEM morphological images suggest the spherical shape of the synthesized nanoparticles. The EDAX spectra identify the presence of Zn, Ca, and O atoms in the samples. The Raman active modes of the ZnO phase were identified by Raman spectral analysis. The analysis of Photoluminescence (PL) spectra gives information about the UV emission and other visible bands corresponding to violet, blue, and green emission representing different intrinsic defects in synthesized nanoparticles. Using UV-vis spectroscopy, the optical transparency and band gap values were examined. The energy band gap obtained by Tauc’s plot was decreased with the increase in Ca doping. Impedance analysis shows that the grain conductivity increased with the increase in dopant concentration. Contrarily, the total conductivity decreased with the increasing doping concentration due to increased grain boundary resistance. The proposed work demonstrates the changes in microstructure, electrical conductivity, and optical bandgap energy with Ca-doping. These synthesized Ca-doped ZnO nanoparticles could be promising materials for photocatalytic applications.
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Copyright © 2023 K. N. Ganesha, H Chandrappa, S R Kumaraswamy, V Annadurai, H. Somashekarappa, R Somashekar
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