title: Gas sensing with high-resolution localized surface plasmon resonance spectroscopy.
abstract: We report the first inert gas sensing and characterization studies based on high-resolution localized surface plasmon resonance (HR-LSPR) spectroscopy. HR-LSPR was used to detect the extremely small changes (<3 × 10(-4)) in bulk refractive index when the gas was switched between He(g) and Ar(g) or He(g) and N2(g). We also demonstrate submonolayer sensitivity to adsorbed water from exposure of the sensor to air (40% humidity) versus dry N2(g). These measurements significantly expand the applications space and characterization tools for plasmonic nanosensors.
authors.affiliation: Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
authors.forename: Julia M
authors.initials: JM
authors.lastname: Bingham
authors.forename: Jeffrey N
authors.initials: JN
authors.lastname: Anker
authors.forename: Lauren E
authors.initials: LE
authors.lastname: Kreno
authors.forename: Richard P
authors.initials: RP
authors.lastname: Van Duyne
mesh_terms: D001128:Argon / Q000032:analysis*; D005740:Gases / Q000032:analysis*; D006371:Helium / Q000032:analysis*; D053758:Nanoparticles / Q000737:chemistry; D009584:Nitrogen / Q000032:analysis*; D012031:Refractometry; D013057:Spectrum Analysis / Q000379:methods; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D005740:Gases; D006371:Helium; D001128:Argon; D009584:Nitrogen