Perovskit oksitlere dayalı CO2 gaz sensörlerinin araştırılması ve geliştirilmesi

The need for energy rapidly increased with the development of humanity and technology. The required energy has been mainly provided by fossil fuels such as coal, natural gas, and oil. However, these sources are limited and nonrenewable. Additionally, massive consumption of these sources is causing environmental problems like global warming via the greenhouse effect. Increased CO2 ratio in the atmosphere is causing solar energy adsorption and keep the heat close to the Earth's surface. Furthermore, CO2 is used for many purposes in daily life such as in refrigerators, fire extinguishers, carbonated drinks, or manufacturing processes. Thus, CO2 has a crucial role on the carbon cycle which is necessary for the living creatures and the Earth, but it harms human health when it is not properly handled. It is highly important to control the level of CO2 in the environment for comfort and health. Thus, main purpose of this study is to develop chemiresistive CO2 sensing materials and manufacture highly efficient and low-cost sensor and also another the synthesis and characterization of ABO3 type perovskites and examine them as CO2 sensing materials. In the presented work, LaMnO3 and LaTiO3 based undoped and doped perovskites were prepared with sol-gel method and the films of these perovskites were examined for CO2 sensing. The film were deposited with electrophoretic deposition and spin coating methods. Material characterization was performed with various techniques such as X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy (SEM). Porous structure and surface area of the powders were the most important parameters for a good sensing material. Thus, the dopant ratio and dopant type were examined carefully with homemade sensing setup to obtain the best working sensing material. Also, gas sensing properties were studied different parameters like temperature, and gas concentration to obtain optimum conditions.