title: Self-assembled organic monolayers on epitaxial graphene with enhanced structural and thermal stability.
abstract: Scanning tunnelling microscopy and X-ray reflectivity are used to characterize adlayers of perylenetetracarboxylic diimide (PTCDI) deposited on epitaxial graphene (EG) on SiC(0001). PTCDI adopts a herringbone structural phase on EG/SiC that can accommodate sub-5 nm voids with molecularly defined boundaries and isolated molecular vacancies at room temperature. The PTCDI monolayer remains intact up to substrate temperatures of ~260 °C, thus demonstrating enhanced thermal stability compared to previously studied perylene derivatives on EG/SiC.
authors.affiliation: Dept. of Materials Science & Engineering, Northwestern Univ., Evanston, IL 60208, USA. m-hersam@northwestern.edu.
authors.forename: Hunter J
authors.initials: HJ
authors.lastname: Karmel
authors.forename: John J
authors.initials: JJ
authors.lastname: Garramone
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Emery
authors.forename: Sumit
authors.initials: S
authors.lastname: Kewalramani
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Bedzyk
authors.forename: Mark C
authors.initials: MC
authors.lastname: Hersam