Detection of carbon monoxide and carbon dioxide gases using quartz crystal microbalance coated with a graphitic carbon nitride film

Abstract Graphitic carbon nitride (g-C 3 N 4 ), a semiconducting material with a layered structure, has recently attracted attention as a gas sensing material because of its ability to adsorb various gas molecules. In this study, a g-C 3 N 4 film was applied to a quartz crystal microbalance (QCM) to detect carbon monoxide (CO) and carbon dioxide (CO 2 ) gases. The resonant frequency of the g-C 3 N 4 film-coated quartz crystal changed with CO and CO 2 gas introduction, and the frequency change increased linearly with gas concentration, suggesting quantitative detection is possible. In addition, the different rate constants for CO and CO 2 gas introduction and ejection processes suggest that the g-C 3 N 4 -coated QCM electrode can identify gas molecular species based on their response rates. These results are expected to be useful for developing CO and CO 2 gas sensors.