Phononic Crystal Locally‐Resonant Cavity as a Gas Sensor for Detecting H2S${\rm H}_{\mathbf {2}}{\rm S}$ at Room Temperature

Abstract A phononic crystal‐based gas sensor is proposed for sensing a potentially deleterious gas, . The designed sensor comprises a cavity where the sensing nanomaterials react with the target gas. The resonance features of the sensor, especially resonant frequency, are changed due to the reaction between the nanoparticles and gas. The reaction with gas changes the sensing materials to the other ones, meaning cavity alteration resulting in the resonance frequency shift. Copper oxide (CuO), zinc oxide (ZnO), tin oxide (), and lead oxide (PbO) are the nanomaterials used for detection. These change to copper sulfide (CuS), zinc sulfide (ZnS), tin sulfide (), and lead sulfide (PbS), respectively, because of the reaction with . The mechanical properties of the nanoparticles before and after reaction with target gases are required to evaluate the sensing process. These materials' stiffness tensor and mass density are obtained using the density functional theory.