title: Triazatriangulene as binding group for molecular electronics.
abstract: The triazatriangulene (TATA) ring system was investigated as a binding group for tunnel junctions of molecular wires on gold surfaces. Self-assembled monolayers (SAMs) of TATA platforms with three different lengths of phenylene wires were fabricated, and their electrical conductance was recorded by both conducting probe-atomic force microscopy (CP-AFM) and scanning tunneling microscopy (STM). Similar measurements were performed for phenylene SAMs with thiol anchoring groups as references. It was found that, despite the presence of a sp(3) hybridized carbon atom in the conduction path, the TATA platform displays a contact resistance only slightly larger than the thiols. This surprising finding has not been reported before and was analyzed by theoretical computations of the transmission functions of the TATA anchored molecular wires. The relatively low contact resistance of the TATA platform along with its high stability and directionality make this binding group very attractive for molecular electronic measurements and devices.
authors.affiliation: Nano-Science Center & Department of Chemistry, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.
authors.forename: Zhongming
authors.initials: Z
authors.lastname: Wei
authors.forename: Xintai
authors.initials: X
authors.lastname: Wang
authors.forename: Anders
authors.initials: A
authors.lastname: Borges
authors.forename: Marco
authors.initials: M
authors.lastname: Santella
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Jakob Kryger
authors.initials: JK
authors.lastname: Sørensen
authors.forename: Marco
authors.initials: M
authors.lastname: Vanin
authors.forename: Wenping
authors.initials: W
authors.lastname: Hu
authors.forename: Yunqi
authors.initials: Y
authors.lastname: Liu
authors.forename: Jens
authors.initials: J
authors.lastname: Ulstrup
authors.forename: Gemma C
authors.initials: GC
authors.lastname: Solomon
authors.forename: Qijin
authors.initials: Q
authors.lastname: Chi
authors.forename: Thomas
authors.initials: T
authors.lastname: Bjørnholm
authors.forename: Kasper
authors.initials: K
authors.lastname: Nørgaard
authors.forename: Bo W
authors.initials: BW
authors.lastname: Laursen