Graphene field effect transistors as gas sensors: Lessons learned in new collaborations
Graphene field effect transistors as gas sensors, with sensitivities as low as 1 ppm to ammonia, nitrogen dioxide, and methanol were fabricated. The fabricated devices have active surface areas of at least 40x40 μm2. The studies indicate that sensitivity was enhanced with a deposition of a thin layer of Pd on top of graphene. Measurements also show that the geometry of the chamber for gas sensing affect the transient response of the gas sensor. This PCARI funded project, done in collaboration with UC Berkeley also show the synergy between physics institutions in the Philippines.