Abstract
Co3O4 and ZnO nanoparticles with different morphologies were synthesised by the thermal decomposition of single source precursors obtained from readily available and eco-friendly starting materials (hexamethylenetetramine and metal nitrates). The precursors, which were characterized by elemental analysis, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction and thermal gravimetric analysis, were calcined at 500oC for 2 h, and the oxide samples obtained were characterized by FTIR, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and nitrogen physisorption. XRD showed that the oxides obtained were crystalline and free of extraneous impurity phases. The morphology of the nanoparticles obtained changed from cube-like (Co3O4) to hexagonal-prism like morphology (ZnO), while the particle size increased from 19.6 to 64.5 nm, respectively. The method used simple and cheap precursors, which should make it suitable for large-scale synthesis.
Highlights
IntroductionThe size reduction of these metal oxides, which leads to novel properties that are different from those of the individual atoms as well as their bulk counterparts, makes them potential materials for application in the fields of catalysis, electronics, storage devices, gas sensors and magnetic resonance imaging (de Rivas, López-Fonseca, Jiménez-González, & Gutiérrez-Ortiz, 2012; Devan et al, 2012; Gomez & Tigli, 2013; Kahn et al, 2009)
Metal oxide nanoparticles constitute a class of functional materials on which much attention has been focused recently due to their morphology and size-dependent physical and chemical properties (Devan, Patil, Lin, & Ma, 2012; Niederberger, 2007).The size reduction of these metal oxides, which leads to novel properties that are different from those of the individual atoms as well as their bulk counterparts, makes them potential materials for application in the fields of catalysis, electronics, storage devices, gas sensors and magnetic resonance imaging.Among these metal oxide nanoparticles, nanoscale cobalt and zinc oxides have received much scientific attention because they have interesting size-dependent physico-chemical properties for material as well as industrial applications
The precursors, which were characterized by elemental analysis, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction and thermal gravimetric analysis, were calcined at 500oC for 2 h, and the oxide samples obtained were characterized by FTIR, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and nitrogen physisorption
Summary
The size reduction of these metal oxides, which leads to novel properties that are different from those of the individual atoms as well as their bulk counterparts, makes them potential materials for application in the fields of catalysis, electronics, storage devices, gas sensors and magnetic resonance imaging (de Rivas, López-Fonseca, Jiménez-González, & Gutiérrez-Ortiz, 2012; Devan et al, 2012; Gomez & Tigli, 2013; Kahn et al, 2009) Among these metal oxide nanoparticles, nanoscale cobalt and zinc oxides have received much scientific attention because they have interesting size-dependent physico-chemical properties for material as well as industrial applications. ZnO is biocompatible, nontoxic, chemically stable, and electrochemically active; properties which have enabled its application in biosensing (Gomez & Tigli, 2013)
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