Atomically resolved electronic properties in single layer graphene on α-Al₂O₃ (0001) by chemical vapor deposition.

ABSTRACT: Metal-free chemical vapor deposition (CVD) of single-layer graphene (SLG) on c-plane sapphire has recently been demonstrated for wafer diameters of up to 300 mm, and the high quality of the SLG layers is generally characterized by integral methods. By applying a comprehensive analysis approach, distinct interactions at the graphene-sapphire interface and local variations caused by the substrate topography are revealed. Regions near the sapphire step edges show tiny wrinkles with a height of about 0.2 nm, framed by delaminated graphene as identified by the typical Dirac cone of free graphene. In contrast, adsorption of CVD SLG on the hydroxyl-terminated α-Al₂O₃ (0001) terraces results in a superstructure with a periodicity of (2.66 ± 0.03) nm. Weak hydrogen bonds forme

SUBMITTER: Wordenweber H 

PROVIDER: S-EPMC9637179 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature