High-temperature-resistant h-BN/PVA nanocomposite-based humidity sensors for Morse code transmission and IoT-enabled wireless data acquisition

초록

Hexagonal boron nitride (h-BN), distinguished by its outstanding mechanical robustness, chemical inertness, and thermal resilience, was exfoliated via sonication-assisted methods to yield oxygen-functionalized nanoflakes. These nanostructures were homogeneously integrated into a polyvinyl alcohol (PVA) matrix to fabricate a flexible h-BN/PVA nanocomposite, employed as a super-active layer in a capacitive humidity sensor based on an interdigitated electrode design. The sensor exhibited a high sensitivity of 0.964 nF per %RH, particularly effective in low-humidity regimes. Notably, it demonstrated rapid response and recovery dynamics, along with excellent mechanical durability (tensile strength of 2.7 MPa) and thermal stability up to 70 degrees C. The multi-functionality of the device was validated through real-time respiratory and proximity monitoring, wireless Internet of Things (IoT) integration, and Morse code signal transmission, underscoring its promise for next-generation wearable and smart sensing technologies.

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