title: Indirect Nanoplasmonic Sensing to Probe with a High Sensitivity the Interaction of Water Vapor with Soot Aerosols.
abstract: We demonstrate in this work that the indirect nanoplasmonic sensing lets us follow the adsorption/desorption of water molecules on soot particles that are a major contributor of the global warming. Increasing the relative humidity of the surrounding medium we measure a shift in wavelength of the localized surface plasmon resonance response of gold nanodisks on which soot particles are deposited. We show a singular and reversible blue shift with hydrophilic aircraft soot particles interpreted from a basic model as a reversible morphological change of the soot aggregates. This new method is highly sensitive and interesting to follow the change of optical properties of aerosols during their aging in the atmosphere, where they can adsorb and react with different gas molecules.
authors.affiliation: Aix-Marseille Université, CNRS, CINaM UMR 7325, 13288 Marseille, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Demirdjian
authors.affiliation: Aix-Marseille Université, CNRS, CINaM UMR 7325, 13288 Marseille, France.
authors.forename: Frederic
authors.initials: F
authors.lastname: Bedu
authors.affiliation: Aix-Marseille Université, CNRS, CINaM UMR 7325, 13288 Marseille, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Ranguis
authors.affiliation: Aix-Marseille Université, CNRS, CINaM UMR 7325, 13288 Marseille, France.
authors.forename: Igor
authors.initials: I
authors.lastname: Ozerov
authors.affiliation: Aix-Marseille Université, CNRS, CINaM UMR 7325, 13288 Marseille, France.
authors.forename: Artak
authors.initials: A
authors.lastname: Karapetyan
authors.affiliation: Aix-Marseille Université, CNRS, CINaM UMR 7325, 13288 Marseille, France.
authors.forename: Claude R
authors.initials: CR
authors.lastname: Henry
keywords: UV−vis spectroscopy; aerosols optical properties; interaction water/soot; morphological change; nanoplasmonic