Fig. 17. Corrosion of the Cu surface by the coated 2D materials. (a) Schematic showing the color change of the Cu surface without and with the graphene covering, respectively. (b and c) Optical image of the graphene-protected Cu (111) and Cu (100) facets under humid air. (d and e) Schematic showing the lattice structure of the graphene/Cu (111) and graphene/Cu (100) system. (b–e) Reproduced with permission.¹⁰⁶ Copyright 2017, WILEY-VCH. (f and g) SEM images of the monolayer or multilayer h-BN film on the Cu surface immersed in H₂O₂ for 11 h. Reproduced with permission.¹¹⁰ Copyright 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.