Abstract
AbstractUpon exposure to gases, the surface properties of vapor-sensitive materials such as carbon nanotubes or conducting polymers change. These manifest as change in resistance or relative permittivity which are a measure of the gas concentration. A circular disk resonator using shift in resonant frequency as a measure to sense the gas has been reported for gas-sensing properties of carbon nanotubes. The sensor detected the presence of gases such as helium, oxygen, ammonia with a resonant frequency shift of 0.8, 2.3, and 3.55 MHz, respectively. Ring resonator is another promising resonating structure which can be explored for gas sensing applications. For gas sensing, based on resonant shift technique ring resonator offers more area for the gas to interact than the disk structure. Present research work aims at studying the resonating property of the ring resonator, analyze the performance, and compare with the existing results of the disk sensor using simulation tool HFSS. The gas adsorption is simulated using the change in relative permittivity (εr) of the substrate. Simulation results indicate that ring resonator exhibits higher selectivity compared to disk resonator. This improved selectivity makes the ring resonator detect more variety of gases compared to disk.KeywordsGas sensingCarbon nanotubesRelative permittivityResonant frequencySelectivityHFSSDisk resonatorRing resonator
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