▎ 摘　　要

We examined the temperature (T) dependence of the inverse of quality factors (Q(-1)) of edged and edgeless graphene resonators to evaluate energy dissipation in these resonators. We found that Q(-1) in an edgeless drumhead resonator shows a linear T dependence in a wide range of 20-300 K, while that in an edged doubly clamped resonator shows T-2 and T-0.3 dependence above and below similar to 100 K, respectively. On the basis of these experimental results, and by comparing them with the previous experimental and numerical studies, we discuss the energy dissipation mechanisms in these resonators. The dissipation at free edges causes the T-0.3 dependence in the lower temperature regime, and tensile strain due to the thermal contraction of the clamped-end metal will lead to the T-2 behavior in the higher temperature regime. We demonstrate that elimination of these dissipation sources provides wide-ranging linear-T dependence of Q(-1) in our drumhead resonators. (C) 2014 AIP Publishing LLC.