This paper describes the development of a novel low-cost Rayleigh Surface Acoustic Wave Resonator (SAWR) device coated with a graphene layer that is capable of detecting PPM levels of NO2in air. The sensor comprises two 262 MHz ST-cut quartz based Rayleigh SAWRs arranged in a dual oscillator configuration; where one resonator is coated with gas-sensitive graphene, and the other left uncoated to act as a reference. An array of NMP-dispersed exfoliated reduced graphene oxide dots was deposited in the active area inside the SAWR IDTs by a non-contacting, micro ink-jet printing system. An automated Mass Flow Controller system has been developed that delivers gases to the SAWR sensors with circuitry for excitation, amplification, buffering and signal read-out. This SAW-based graphene sensor has sensitivity to NO2of ca. 25 Hz/ppm and could be implemented in a low-power low-cost gas sensor.
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- Dual saw
- Graphene oxide
- Saw resonator
- Surface acoustic sensor
Thomas, S., Cole, M., DE LUCA, ANDREA., Torrisi, F., Ferrari, A. C., Udrea, F., & Gardner, J. W. (2014). Graphene-coated Rayleigh SAW resonators for NO2detection. Procedia Engineering, 87, 999-1002. https://doi.org/10.1016/j.proeng.2014.11.328