Synthesis,Characterization and Impedance Analysis of Calcium-Doped Zinc Oxide Nanoparticles  

作　　者：K.N.Ganesha H.Chandrappa S.R.Kumarswamy V.Annadurai H.Somashekarappa R.Somashekar 

机构地区：[1]Department of Physics,Yuvaraja’s College,University of Mysore,Mysuru,Karnataka,570005,India [2]SRSMN Govt.First Grade College&PG Study Centre,Barkur,Udupi,Karnataka,576210,India [3]Government First Grade College for Women,Byrapura,T.Narasipura,Mysuru,Karnataka,571124,India [4]Department of Physics,NIE First Grade College,University of Mysore,Mysuru-570008,India [5]Institution of Excellence,Vijnana Bhavana,Manasagangothri,Mysuru,570006,India

出　　处：《Non-Metallic Material Science》2023年第1期49-63,共15页非金属材料科学（英文）

摘　　要：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.

关 键 词：Solution combustion synthesis ZNO IMPEDANCE Optical properties PHOTOLUMINESCENCE 

分 类 号：TB3[一般工业技术—材料科学与工程]