  Chemical vapour deposition (CVD) is a promising method for producing
large-scale graphene (Gr). Nevertheless, microscopic inhomogeneity of Gr grown
on traditional metal substrates such as copper or nickel results in a spatial
variation of Gr properties due to long wrinkles formed when the metal substrate
shrinks during the cooling part of the production cycle. Recently, molybdenum
(Mo) has emerged as an alternative substrate for CVD growth of Gr, mainly due
to a better matching of the thermal expansion coefficient of the substrate and
Gr. We investigate the quality of multilayer Gr grown on Mo and the relation
between Gr morphology and nanoscale mechanical and electrical properties, and
spatial homogeneity of these parameters. With atomic force microscopy (AFM)
based scratching, Kelvin probe force microscopy, and conductive AFM, we measure
friction and wear, surface potential, and local conductivity, respectively. We
find that Gr grown on Mo is free of large wrinkles that are common with growth
on other metals, although it contains a dense network of small wrinkles. We
demonstrate that as a result of this unique and favorable morphology, the Gr
studied here has low friction, high wear resistance, and excellent homogeneity
of electrical surface potential and conductivity.
