Dispersion Stability, Ligand Structure and Conformation, and SERS Activities of 1-Alkanethiol Functionalized Gold and Silver Nanoparticles

    Authors

    S. M. Ansar; M. Gadogbe; K. Siriwardana; J. Y. Howe; S. Dogel; H. Hosseinkhannazer; W. E. Collier; J. Rodriguez; S. L. Zou;D. M. Zhang

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. C

    Keywords

    SELF-ASSEMBLED MONOLAYERS; ENHANCED RAMAN-SCATTERING; SODIUM-BOROHYDRIDE; ROOM-TEMPERATURE; SURFACE; AG; FILMS; WATER; DESULFURIZATION; QUANTIFICATION; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary

    Abstract

    Dispersion stability, ligand structure and conformation, and SERS activities of 1-alkanethiol (CnH2n+1SH, n = 214) functionalized gold and silver nanoparticles (AuNPs and AgNPs) were studied as a function of alkanethiol carbon chain length and nanoparticle (NP) type and size. The dispersion stability of alkanethiol functionalized NPs in water increases with increasing alkanethiol chain length and NP size, and the stabilities of the alkanethiol-containing AuNPs are higher than their AgNP counterparts. C3H7SH and longer alkanethiols are highly ordered on AgNPs but disordered on AuNPs. The SERS intensity of the CS stretch band for the model alkanethiols on AgNPs and AuNPs decays exponentially (I = I-0 exp(-N-c/N-0)) with increasing number of carbon atoms (N-c). The empirical decay length N0, in terms of the number of the carbon atoms, is 1.29, 0.53, and 0.10 for AgNPs with diameters of 50, 30, and 10 nm, respectively. This decay length is less than 1 for AuNPs of difference sizes. These results show that changing the NP gap size by a distance equivalent to a single chemical bond can have a significant impact on the NP integrated SERS activities.

    Journal Title

    Journal of Physical Chemistry C

    Volume

    118

    Issue/Number

    43

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    24925

    Last Page

    24934

    WOS Identifier

    WOS:000344135500014

    ISSN

    1932-7447

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