An intelligent MXene/MoS₂ acoustic sensor with high accuracy for mechano-acoustic recognition

Auditory systems are the most efficient and direct strategy for communication between human beings and robots. In this domain, flexible acoustic sensors with magnetic, electric, mechanical, and optic foundations have attracted significant attention as key parts of future voice user interfaces (VUIs) for intuitive human-machine interaction. This study investigated a novel machine learning-based voice recognition platform using an MXene/MoS₂ flexible vibration sensor (FVS) with high sensitivity for acoustic recognition. The performance of the MXene/MoS₂ FVS was systematically investigated both theoretically and experimentally, and the MXene/MoS₂ FVS exhibited high sensitivity (25.8 mV/dB). An MXene/MoS₂ FVS with a broadband response of 40–3,000 Hz was developed by designing a periodically ordered architecture featuring systematic optimization. This study also investigated a machine learning-based speaker recognition process, for which a machine-learning-based artificial neural network was designed and trained. The developed neural network achieved high speaker recognition accuracy (99.1%). [Figure not available: see fulltext.]