Sci. rep. (Nat. Publ. Group) Sci. rep. (Nat. Publ. Group) Towards standardisation of contact and contactless electrical measurements of CVD graphene at the macro-, micro- and nano-scale Melios Christos Huang Nathaniel Callegaro Luca Centeno Alba Cultrera Alessandro Cordón Álvaro Panchal Vishal Arnedo Israel Redo-Sanchez Albert Etayo David Fernández Montserrat López Alex Rozhko Sergiy Txoperena Oihana Zurutuza Amaia Kazakova Olga 2020 research-article