title: Vibrational Spectroscopic Observation of Atomic-Scale Local Surface Sites Using Site-Selective Signal Enhancement.
abstract: Molecule-substrate interactions are sensitively affected by atomic-scale surface structures. Unique activity in heterogeneous catalysts or electrocatalysts is often related with local surface sites with specific structures. We demonstrate that adsorption geometry of a model molecule with an isocyanide anchor is drastically varied among one-fold atop, two-fold bridge, and three-fold hollow configurations with increasing the size of atomic-scale local surface sites of Pd islands on an Au(111) model surface. The vibrational spectroscopic observation of such local information is realized by site-selective and self-assembled formation of hotspots, where Raman scattering intensity is significantly enhanced via excitation of localized surface plasmons.
authors.affiliation: Division of Chemistry, Graduate School of Science, Hokkaido University , Sapporo 060-0810, Japan.|Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan.
authors.forename: Jian
authors.initials: J
authors.lastname: Hu
authors.affiliation: Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University , Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan.
authors.forename: Nagahiro
authors.initials: N
authors.lastname: Hoshi
authors.affiliation: Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan.|International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan.
authors.forename: Kohei
authors.initials: K
authors.lastname: Uosaki
authors.affiliation: Division of Chemistry, Graduate School of Science, Hokkaido University , Sapporo 060-0810, Japan.|Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan.|Japan Science and Technology Agency, PRESTO , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Ikeda
keywords: Atomic-scale surface defects; localized surface plasmon resonance; metal−molecule interactions; surface enhanced Raman scattering