Single-layer Graphene Motion and Mass Sensors with Electrical Readout.

We report for the first time the implementation of graphene electromechanical resonators that can detect their own motion. Suspended single-layer graphene field-effect transistors allow for electrical detection of the resonances while functioning as heterodyne mixers in a manner analogous to the operation of a radio receiver. Mechanical resonances occur in the 10-100 MHz range, can be lithographically-tailored, are tunable by tens of MHz, and have quality factors up to 200 while operated in vacuum at room temperature. Furthermore, by analyzing the frequency response of the resonators, we succeed in weighing both the pristine single-layer graphene and with a layer of organic material deposited on.