Controlled sol–gel synthesis of oxygen sensing CdO : ZnO hexagonal particles for different annealing temperatures

Abstract

CdO : ZnO hexagonal particles were synthesized by a sol-gel precipitation method at different annealing temperatures. A mixed crystal phase of cubic and wurtzite structures was observed from X-ray diffraction patterns. The micrographs showed hexagonal shapes of the CdO : ZnO nanocomposites particles. The energy dispersive X-ray spectroscopy mapping images showed a uniform distribution of the Cd and Zn. The CdO : ZnO nanocomposite pallet annealed at 550 C has an electrical resistance of 0.366 kU at room temperature. The nanocomposites showed an excellent sensing response against oxygen gas with a sensing response of 47% at 200 C for the CdO : ZnO particles annealed at 550 C.The sensor response and recovery times were found to be 43s and 45s, respectively. The sensor response was due to the sorption of oxygen ions on the surfaces of the CdO : ZnO hexagonal particles.

SCHOTTKY DIODE FABRICATION VIA COLD SUBSTRATE EVAPORATED Ag ON SOL-GEL DERIVED ZnO ULTRA-THIN FILMS FOR SEMICONDUCTOR DEVICES

“…Since ZnO films are not grown on a special cubic substrate and are not produced under high pressure (10Gpa), this may influence this situation. According to Rajput et al [18], similar results were found in which the ZnO structure obtained from the X-ray diffraction device (002) had a preferentially oriented wurtzite hexagonal crystal structure. The average crystal size of the ZnO film was calculated by using the Scherrer equation utilized form X-ray diffraction line-broadening;…”

Advanced Synthesis and Characterization of CdO/CdS/ZnO Heterostructures for Solar Energy Applications

“…Oxygen annealing, in turn, aids in the removal of unwanted impurities or defects that may have been introduced during the deposition process [54][55][56][57]. Correcting such flaws can significantly enhance the stability and longevity of the heterostructure's performance [58,59]. Additionally, the process allows for precise tuning of the stoichiometry of oxide layers, allowing researchers to modulate and optimize the properties of the heterostructure according to specific application needs [60].…”