Cobalt Effect on the Growth of Cadmium Oxide Nanostructure Prepared by Spray Pyrolysis Technique

Abstract

Spray pyrolysis technique (SPT) is employed to synthesize cadmium oxide nanostructure with 3% and 5% Cobalt concentrations. Films are deposited on a glass substrate at 350 ᵒC with 150 nm thickness. The XRD analysis revealed a polycrystalline nature with cubic structure and (111) preferred orientation. Structural parameters represent lattice spacing, crystallite size, lattice parameter and dislocation density. Homogeneous surfaces and regular distribution of atoms were showed by atomic force microscope (AFM) with 1.03 nm average roughness and 1.22 nm root mean square roughness. Optical properties illustrated a high transmittance more than 85% in the range of visible spectrum and decreased with Co concentration increasing. The absorption coefficient values decreased with increasing wavelength and the prepared films had absorption coefficient values greater than 10 4 cm -1 . The optical energy gap values for allowing direct transition (ADT) varied from 2.78 to 2.63 eV with increasing Co concentration, while the energy gap for allowing indirect transition (AIDT) varied from 1.85 to 1.6 eV with Co concentration.

Nitrogen Dioxide Gas Sensor of In₂O₃- ZnO Polyhedron Nanostructures Prepared by Spray Pyrolysis

“…The preferred thin film sample for gas sensitivity has a nanostructure of medium degree of contact between each other as a neck connection. So the prepared sample at 573 K may be the best for gas sensing since oxygen gas adsorbed on its surface allows a depletion layer formed on its surface, reducing the channels between particles against the charge carriers and creating a significant change in sensor resistance [21]. Table 2 displays the minimum (Dmin), maximum (Dmax), and average particle diameter (Dave) of the IZO layers at different Ts.…”

Effect of Sintering Temperature on the Structural and Morphological Properties of Hydroxyapatite Prepared by Precipitation Method

“…HAp powders produced using a solid-state method at high temperatures have high purity and crystallinity. The particles produced in this method offer a variety of shapes and sizes [5]. Furthermore, wet techniques including sol-gel, hydrothermal, and chemical precipitation are successful at producing uniform nano-sized HAp particles [6].…”