Polycrystalline graphene and other two-dimensional materials
Oleg V. Yazyev & Yong P. Chen
Nature Nanotechnology (2014) doi:10.1038/nnano.2014.166
Published online: 17 August 2014 | doi:10.1038/nnano.2014.166 http://www.nature.com/nnano/journal/vaop/ncurrent/pdf/nnano.201
Many thanks.