Studies of structural, optical, and electrical properties associated with defects in sodium-doped copper oxide (CuO/Na) nanostructures

Autor:	M.S. Qureshi, Hafsa Siddiqui, Fozia Z. Haque, Mohammad Ramzan Parra, M. Manzar Malik
Rok vydání:	2018
Předmět:	010302 applied physics Copper oxide Ionic radius Materials science Nanostructure Mechanical Engineering Doping chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Copper Crystallography chemistry.chemical_compound chemistry Mechanics of Materials Impurity 0103 physical sciences General Materials Science Grain boundary 0210 nano-technology Monoclinic crystal system
Zdroj:	Journal of Materials Science. 53:8826-8843
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-018-2179-6
Popis:	In the present paper, we report a detailed study on the sodium (Na) doping-induced modifications in the copper oxide (CuO) nanostructure and its properties. A facile and sustainable sol–gel synthesis approach was employed for the preparation of high-quality pristine CuO- and Na-doped CuO nanostructures(1.0, 3.0, 5.0 and 7.0 mol% doping levels, CuO/Na) with controlled shape and composition. Due to the remarkable difference in the ionic radii of Cu2+ (0.73 A) and Na+ (1.02 A), Na+ substitution in place of Cu2+ generates strain/distortions in CuO lattice. The XRD analysis reveal the structural alteration from monoclinic to cubic symmetry with increase in doping level and also reveal the phase purity up to 3% doping level, and beyond this (i.e., for 5 and 7% doping level) small amount of impurity phase corresponding to Na2O was observed. The FTIR results further confirmed the presence of the Na–Cu–O stretching vibrations at higher Na-doped samples. Morphology of the samples indicates that the Na-doped CuO nanostructures exhibit less agglomeration compared to pristine CuO nanoparticles. The presence of Na in CuO lattice were found to greatly enhances optical and electrical properties owing to the formation of defects like copper vacancies and oxygen vacancies at the grain boundaries of the nanoparticles with increased doping of Na.
Databáze:	OpenAIRE
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