Figure 4 .
Graphene resonators response to mass adsorption. (a) Frequency shifts of a graphene resonator due to mass adsorption as a function of actuation amplitude p0 and the amount of adsorbed mass Δm. (b) Frequency shifts of a graphene resonator due to atomic adsorption with the mass of Δm = 10 ag are found as a function of actuation amplitude p0, while the dimensionless parameter θ of a graphene resonator with mass adsorption of Δm = 10 ag is shown. (c) Frequency shifts of graphene resonators due to atomic adsorption with mass of Δm = 20 ag with respect to the size of graphene resonators as well as the actuation amplitude p0.
Dai et al. Nanoscale Research Letters 2012 7:499 doi:10.1186/1556-276X-7-499