title: A molecule carrier.
abstract: We found that anthraquinone diffuses along a straight line across a flat, highly symmetric Cu111 surface. It can also reversibly attach one or two CO2 molecules as "cargo" and act as a "molecule carrier," thereby transforming the diffusive behavior of the CO2 molecules from isotropic to linear. Density functional theory calculations indicated a substrate-mediated attraction of approximately 0.12 electron volt (eV). Scanning tunneling microscopy revealed individual steps of the molecular complex on its diffusion pathway, with increases of approximately 0.03 and approximately 0.02 eV in the diffusion barrier upon attachment of the first and second CO2 molecule, respectively.
authors.affiliation: Pierce Hall, University of California, Riverside, CA 92521, USA.
authors.forename: K L
authors.initials: KL
authors.lastname: Wong
authors.forename: G
authors.initials: G
authors.lastname: Pawin
authors.forename: K-Y
authors.initials: KY
authors.lastname: Kwon
authors.forename: X
authors.initials: X
authors.lastname: Lin
authors.forename: T
authors.initials: T
authors.lastname: Jiao
authors.forename: U
authors.initials: U
authors.lastname: Solanki
authors.forename: R H J
authors.initials: RH
authors.lastname: Fawcett
authors.forename: L
authors.initials: L
authors.lastname: Bartels
authors.forename: S
authors.initials: S
authors.lastname: Stolbov
authors.forename: T S
authors.initials: TS
authors.lastname: Rahman