화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.21, 283-291, January, 2015
DOI10.1016/j.jiec.2014.01.047  Export Citation
Influence of Cr incorporation on structural, dielectric and optical properties of ZnO nanoparticles
M. Mehedi Hassan1, Wasi Khan1, †, Ameer Azam1, 2, and A.H. Naqvi1
  • 1Centre of Excellence in Materials Science (Nanomaterials), Department of Applied Physics, Z.H. College of Engineering & Technology, Aligarh Muslim University, Aligarh 202002, India
  • 2Centre of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia
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This study demonstrated the effect of Cr doping on structural, dielectric and optical behavior of ZnO nanoparticles synthesized through sol.gel method. Characteristic investigations have been carried out by X-ray diffraction, Field emission scanning electron microscope, Energy dispersive X-ray spectrometry, and Transmission electron microscope. The results confirmed the formation of nanoparticles in polycrystalline single phase with hexagonal wurtzite structure. The crystallite size has been found to vary around 20 nm. Dielectric studies were carried out by Impedance spectroscopy. The decrease effect of dielectric parameters with increase in dopant has been explained on the basis of Maxwell.Wagner model and Koops phenomenological theory. The impedance analysis suggested that the contribution of grain boundaries is dominating over grain contribution. A red shift in UV.vis spectra signified that band gap can be tuned by Cr doping from 3.32 to 3.22 eV because of the s.d and p.d exchange interactions.
Keywords:Cr doped ZnO;XRD;TEM;Band gap;Dielectric constant
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