Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2017
Student: TUĞBA ÇORLU
Supervisor: SELİM ACAR
Open Archive Collection: AVESIS Open Access Collection
Abstract:In this thesis, metal oxide structures were enlarged and characterized as a sensor for electronic nose systems used to diagnose asthma. ZnO structures doped with copper at different concentrations were amplified by Successive Ionic Layer Adsorption and Reaction (SILAR) method in order to investigate the effect of the additive ratio on gas sensing properties. The grown sensors were annealed in a nitrogen gas atmosphere at 300 ˚C temperature. Structural and morphological properties of the produced thin films were examined by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Optical Absorption. X-ray films are said to be made of polycrystalline amorphous structure, while the sensors produced show a change in copper configuration. Depending on the SEM image, it was observed that the morphological properties of the producing sensors changed. Looking at the optical absorption measurements, it was observed to fall in the band gap ranges due to the effect of the copper doping. Gas detection measurements were made at 30-135° C temperature range to determine the working temperature of the produced materials as the gas sensor. The optimum working temperature of the samples was determined to be 55˚C. the gas sensing measurements were taken at optimum working temperature for different NO gas concentrations. It was observed that the sensors produced were receptive to 20 ppb NO gas concentration. The highest sensitivity among the sensors produced was obtained in the Zn0.90Cu0.10O sample. Impedance was made in the presence and absence of NO gas. An increase in the impedance values of the sensors was observed when exposed to NO gas.