title: Raman scattering at plasmonic junctions shorted by conductive molecular bridges.
abstract: Intensity spikes in Raman scattering, accompanied by switching between line spectra and band spectra, can be assigned to shorting the junction plasmon through molecular conductive bridges. This is demonstrated through Raman trajectories recorded at a plasmonic junction formed by a gold AFM tip in contact with a silver surface coated either with biphenyl-4,4'-dithiol or biphenyl-4-thiol. The fluctuations are absent in the monothiol. In effect, the making and breaking of chemical bonds is tracked.
authors.affiliation: Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States.
authors.forename: Patrick Z
authors.initials: PZ
authors.lastname: El-Khoury
authors.forename: Dehong
authors.initials: D
authors.lastname: Hu
authors.forename: V Ara
authors.initials: VA
authors.lastname: Apkarian
authors.forename: Wayne P
authors.initials: WP
authors.lastname: Hess
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D020349:Surface Plasmon Resonance; D013499:Surface Properties
chemical_list: D001713:Biphenyl Compounds; D006046:Gold; D012834:Silver; C010574:biphenyl