Carbon nanotube-based microstrip antenna gas sensor

Carbon nanotubes have been widely studied for their applications in sensors due to their promising physical and chemical properties. In this paper, we explore the potential of applying carbon nanotubes to gas sensing equipment. The sensor uses an antenna to detect change in return loss from normal operating frequency on exposure to different polar and non-polar gases. Carbon nanotubes help amplify this shift to improve the gas sensitivity. The presented study shows that carbon nanotubes can provide a frequency shift in return loss that can identify various gases. Simulation results from A SYS High Frequency Simulation Software provide proof of the concept while experimental results from three gases have shown repeatable frequency shifts.