Fabrication and Evaluation of Single Layer Graphene/SnO2 Based Gas Sensor for NO2 Detection

초록

Due to the rapid development of industry, various gases are emitted into the atmosphere, causing environmental pollution and significantly increasing negative health effects on the human body. Among these gases, nitrogen dioxide (NO<inf>2</inf>) is highly dangerous and can cause various health issues at both low and high concentrations. Severe exposure may even lead to death. Various gas-detection sensors are being developed to detect these gases; however, their effectiveness is limited due to the chemical properties of the gases and environmental factors that affect signal stability. Graphene is a material composed of carbon, known for its excellent chemical properties, low-cost production, and stability at high temperatures as well as in extreme environments. In this study, we synthesized graphene monolayers using low-pressure chemical vapor deposition (LPCVD) and introduced p-type doping with metal oxide tin dioxide SnO<inf>2</inf> to enhance its gas-sensing properties. The characteristics of low-concentration NO<inf>2</inf> sensing were evaluated, and the impact of temperature changes on sensing performance was analyzed using an internal ceramic heater. © 2024, Korean Sensors Society. All rights reserved.

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