title: Near-infrared surface-enhanced Raman spectroscopy (NIR-SERS) for the identification of eosin Y: theoretical calculations and evaluation of two different nanoplasmonic substrates.
abstract: This work demonstrates the development of near-infrared surface-enhanced Raman spectroscopy (NIR-SERS) for the identification of eosin Y, an important historical dye. NIR-SERS benefits from the absence of some common sources of SERS signal loss including photobleaching and plasmonic heating, as well as an advantageous reduction in fluorescence, which is beneficial for art applications. This work also represents the first rigorous comparison of the enhancement factors and the relative merits of two plasmonic substrates utilized in art applications; namely, citrate-reduced silver colloids and metal film over nanosphere (FON) substrates. Experimental spectra are correlated in detail with theoretical absorption and Raman spectra calculated using time-dependent density functional theory (TDDFT) in order to elucidate molecular structural information and avoid relying on pigment spectral libraries for dye identification.
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, Illinois 60201, United States.
authors.forename: Nathan G
authors.initials: NG
authors.lastname: Greeneltch
authors.forename: Amber S
authors.initials: AS
authors.lastname: Davis
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Valley
authors.forename: Francesca
authors.initials: F
authors.lastname: Casadio
authors.forename: George C
authors.initials: GC
authors.lastname: Schatz
authors.forename: Richard P
authors.initials: RP
authors.lastname: Van Duyne
authors.forename: Nilam C
authors.initials: NC
authors.lastname: Shah
mesh_terms: D003102:Colloids / Q000737:chemistry; D004801:Eosine Yellowish-(YS) / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D011789:Quantum Theory; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003102:Colloids; D012834:Silver; D004801:Eosine Yellowish-(YS)