▎ 摘　　要

Graphene on the substrate can form bubbles rising above the sheet. In some cases, the bubbles is a perfect spherical surface crown, and its radius can be adjusted by external electric field. In this manuscript, we theoretically investigate the voltage dependence of the spherical bubble's radius. The calculated results are in good agreement with recent experiments on the graphene bubble controlled by applied gate voltage [Georgiou et al., Appl. Phys. Lett. 99, 093103 (2011)]. (C) 2013 AIP Publishing LLC.