الفهرس 
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Abstract
Global warming and climate change have recently become alarming problems. Therefore, the desire to use gas sensors to reduce global warming and control climate change is concentrated. Carbon dioxide (CO2) is an important greenhouse gas from national industries and other sources, 22% of global warming is due to carbon dioxide in the environment.
In this paper, thin-film electrodes (ZnO and ZnO/CNTs) were prepared. As electrodes for carbon dioxide sensing. XRD, FTIR, SEM, and TEM analysis were also used to determine the composition and morphology of the prepared nanomaterials. After the addition of CNT to ZnO, a change in the shape of the films occurred which led to an increase in the grain size leading to an increase in sensitivity of CO2 more than other gases.
This thesis falls into Five chapters:
Chapter One:
It provides an overview of gas sensors, their history, and their types. Next, the metal oxide semiconductor gas sensors, the mechanism of action of the sensor and factors affecting it, and discussed the properties of metal oxide semiconductor sensors.
After that, they discussed the properties of Zinc oxide, the properties of carbon nanotubes, their uses in gas sensors, and their properties after incorporating them into the gas sensors.
Discuss some methods of preparing films with nanostructures, such as spray pyrolysis, chemical vapor deposition technology, and SILAR method, and the basic steps of each technique.
Chapter Two:
Processing and characterization of the manufactured thin films have been completed. Been studied the structure, functional groups, morphology, optical analysis, and chemical composition with XRD, FTIR, SEM & TEM, UV-VIZ spectroscopy, and EDX, respectively.
Chapter Three:
The first part of the paper presented ZnO films, carbon nanotubes, and zinc oxide/carbon nanotubes that were fabricated. Discussed the gas response mechanism including dynamic response, response time and recovery time, repeatability (reducibility), stability, and selectivity of ZnO/CNT for CO2 gas.
Chapter Four:
The first part of the paper presented ZnO films with different deposition times that were fabricated. Study the characterization of these prepared thin films. Discussed the gas response mechanism included dynamic response, response time and recovery time, repeatability (reducibility), stability, and selectivity of ZnOfilms (6h, 10h, and12h) for CO2 gas.
Chapter Five:
It includes a discussion of the thesis.