Acetone sensor based 1D defective phononic crystal as a highly sensitive biosensor application

Abstract

In the present work, a one-dimensional (1D) phononic crystal (PnC) was prepared as a biomarker for measuring acetone concentrations in water. As acetone is considered a very important substance for human health, it is also looked as a vital industrial material in medicine, fiber, and solvent industries. Thereby measuring the smallest changes in acetone concentration efficiently is the main target of this study. For this purpose, a binary multilayer 1D PnC sensor of the configuration ([lead/epoxy]2acetone([lead/epoxy]2) with a defect layer filled with acetone in-between is considered. Each acetone concentration induces a specific resonant peak (the maximum transmitted frequency inside the phononic band gap) which is related directly to acetone acoustic properties. Moreover, our results revealed that acetone acts as two substances with opposite properties depending on the direction of the resonant peak. Where, for concentrations up to the value of 9.1%, the resonant peak shifted towards the high frequency range. While for concentrations starting from the percentage of 10%, the resonant peak shifted towards the low frequency range. Finally, the sensor performance parameters such as sensitivity (S), quality factor (Q), and figure of merit (FOM) were calculated for the two concentration ranges. The sensor provided high sensitivity with a value of 4.29 × 107 Hz, quality factor of 20,732, resolution of 1,741,200 Hz, and FOM of 52.