Coupled Piezoresistive Graphene Nano-Resonators

Single atom thick graphene nanomechanical resonators can have very low mass yet high stiffness leading to the potential of very high sensitivity frequency based mass and force sensors. This sensitivity can be further enhanced by coupling two resonators using the Eigenvalues of the response. However, high Q graphene resonators are difficult to manufacture and measure. In this paper, we report the first ever coupled graphene nano-resonator system utilizing the inherent piezoresistivity of graphene. The structure offers mass sensing abilities of zeptogram level using the eigenvectors and quality factor of 1000. It also showcases the potential of making very large coupled arrays to measure more than one substance using a single sensor.