title: Communication: Reactions and adsorption at the surface of silver nanoparticles probed by second harmonic generation.
abstract: Even though nanoparticles have dimensions much smaller than the optical wavelength and shapes commonly with inversion symmetry, we show, for the first time, direct experimental evidence that second harmonic generation (SHG) can be detected from the surface layer of metallic nanoparticles, in this case 40 nm radius Ag particles. The SH intensity detected is shown to substantially decrease upon chemical bonding of thiol molecules to the Ag particle surface. The surface generated SH intensity can be used for probing properties and processes at the nanoparticle surface.
authors.affiliation: Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Gan
authors.forename: Grazia
authors.initials: G
authors.lastname: Gonella
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Hai-Lung
authors.initials: HL
authors.lastname: Dai
mesh_terms: D000327:Adsorption; D055598:Chemical Phenomena; D003102:Colloids / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D013057:Spectrum Analysis; D013499:Surface Properties
chemical_list: D003102:Colloids; D009942:Organometallic Compounds; D012834:Silver