title: Molecular direction dependence of single-molecule conductance of a helical peptide in molecular junction.
abstract: The helix-peptide dipole effect on single-molecule conductance was analysed experimentally and theoretically with a single 8mer helical peptide. The helical peptide was immobilized on a gold surface in two opposite directions of the helix dipole. Single-molecule conductance of the helical peptide was determined to be 2.4 × 10(-5) G(0) by scanning tunneling microscopy (STM) break-junction measurements under the condition of applied bias voltage parallel to the dipole, which was about 1.2-fold larger than that in the anti-parallel direction. Theoretical calculation also supports that the helix dipole influences the electron transport reaction depending on parallel or anti-parallel orientation of the dipole against the applied electric field.
authors.affiliation: Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Uji
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Morita
authors.forename: Shunsaku
authors.initials: S
authors.lastname: Kimura
mesh_terms: D004553:Electric Conductivity; D004579:Electron Transport; D004583:Electrons; D006046:Gold / Q000737:chemistry; D009842:Oligopeptides / Q000737:chemistry*; D017433:Protein Structure, Secondary; D011789:Quantum Theory
chemical_list: D009842:Oligopeptides; D006046:Gold