2D Material Integrated Two Port Surface Acoustic Wave Resonator Vapour Sensors: Design, Analysis, and Characterisation

This thesis explores improved gas sensors for detecting volatile organic compounds (VOCs) and humidity, crucial for air quality and health monitoring. Current sensors lack precision and efficiency, but surface acoustic wave (SAW) devices, especially two-port resonators, offer better sensitivity and compactness. Coating these with graphene oxide (GO) enhances performance, but challenges like cross-sensitivity and coating placement remain. The study found that asynchronous SAW resonators outperform synchronous ones when integrated with a sensing film. An electrophoretic deposition method succeeded in producing high performance GO-based humidity sensors in both electrode and SAW platforms. A breakthrough dual-measurement SAW sensor successfully distinguished different vapours.