  Graphene mechanical resonators are the ultimate two-dimensional
nanoelectromechanical systems (NEMS) with applications in sensing and signal
processing. While initial devices have shown promising results, an ideal
graphene NEMS resonator should be strain engineered, clamped at the edge
without trapping gas underneath, and electrically integratable. In this letter,
we demonstrate fabrication and direct electrical measurement of circular SU-8
polymer-clamped chemical vapor deposition (CVD) graphene drum resonators. The
clamping increases device yield and responsivity, while providing a cleaner
resonance spectrum from eliminated edge modes. Furthermore, this resonator is
highly strained, indicating its potential in strain engineering for performance
enhancement.
