▎ 摘　　要

A helium ion microscope is used to produce nanoscale patterns on different regions of a graphene device. The patterns consist of uniformly spaced strips with varying spacing in each region. Measurements of the longitudinal magnetoconductivity in each region at different temperatures and carrier densities reveal a transition from metallic to insulating regimes as the density of defects increases. We use the weak localization theory and Mott's theory for disordered two-dimensional systems to analyze the conductivity as it crosses the threshold value of 4e(2)/h.