Comparison of Characteristics of a ZnO Gas Sensor Using a Low-Dimensional Carbon Allotrope

Owing to the increasing construction of new buildings, the increase in the emission of formaldehyde and volatile organic compounds, which are emitted as indoor air pollutants, is causing adverse effects on the human body, including life-threatening diseases such as cancer. A gas sensor was fabricated and used to measure and monitor this phenomenon. An alumina substrate with Au, Pt, and Zn layers formed on the electrode was used for the gas sensor fabrication, which was then classified into two types, A and B, representing the graphene spin coating before and after the heat treatment, respectively. Ultrasonication was performed in a 0.01 M aqueous solution, and the variation in the sensing accuracy of the target gas with the operating temperature and conditions was investigated. As a result, compared to the ZnO sensor showing excellent sensing characteristics at 350 degrees C, it exhibited excellent sensing characteristics even at a low temperature of 150 degrees C, 200 degrees C, and 250 degrees C.

Automated summary

Due to the increasing construction of new buildings, the emission of indoor air pollutants such as formaldehyde and volatile organic compounds has increased, causing adverse effects on human health, including life-threatening diseases like cancer. To measure and monitor this phenomenon, a gas sensor was developed. The gas sensor was fabricated using an alumina substrate with Au, Pt, and Zn layers formed on the electrode, and it was classified into two types, A and B, representing the graphene spin coating before and after heat treatment, respectively. By investigating the variation in sensing accuracy of the target gas with operating temperature and conditions, it was found that the sensor exhibited excellent sensing characteristics even at low temperatures of 150°C, 200°C, and 250°C, compared to the ZnO sensor showing excellent sensing characteristics at 350°C.