Encapsulated Laser-Induced Graphene Flexible Piezo-resistive Sensors for Speech Recognition

Traditional sound detection systems comprised of capacitive microphones and PZT transducers are costly for impermanent healthcare monitoring. In recent times, an increasing amount of scholarly interest focuses on the utilisation of laser-induced graphene (LIG) materials due to their capacity to freely customise sensor patterns from carbon substrates. In order to reduce the cost of the device and facilitate its integration with wearable electronics, we present a promising LIG sensor design with nontoxic medical-grade adhesive encapsulation for wearable sound recognition. After encapsulation, the LIG sensor achieves a sheet resistance of approximately 300 Ω/sq. The LIG sensor with encapsulation has a fractional change in resistance within 20% after 1000 bending cycles. The LIG-based throat sound detection design shows notable advantages including one-step fabrication, high sensitivity, good flexibility, and low cost, revealing a great deal of promise for assisting the disabled and integrating with the future wearable healthcare sensing platform.