Removal of Molecular Adsorbates on Gold Nanoparticles Using Sodium Borohydride in Water

    Authors

    S. M. Ansar; F. S. Arneer; W. F. Hu; S. L. Zou; C. U. Pittman;D. M. Zhang

    Comments

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    Abbreviated Journal Title

    Nano Lett.

    Keywords

    Organothiols; hydride; gold nanoparticles; desorption; sodium; borohydride; ENHANCED RAMAN-SPECTROSCOPY; SELF-ASSEMBLED MONOLAYERS; SURFACE; CHEMISTRY; THIOLS; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &; Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter

    Abstract

    The mechanism of sodium borohydride removal of organothiols from gold nanoparticles (AuNPs) was studied using an experimental investigation and computational modeling. Organothiols and other AuNP surface adsorbates such as thiophene, adenine, rhodamine, small anions (Br- and I-), and a polymer (PVP, poly(N-vinylpyrrolidone)) can all be rapidly and completely removed from the AuNP surfaces. A computational study showed that hydride derived from sodium borohydride has a higher binding affinity to AuNPs than organothiols. Thus, it can displace organothiols and all the other adsorbates tested from AuNPs. Sodium borohydride may be used as a hazard-free, general-purpose detergent that should find utility in a variety of AuNP applications including catalysis, biosensing, surface enhanced Raman spectroscopy, and AuNP recycle and reuse.

    Journal Title

    Nano Letters

    Volume

    13

    Issue/Number

    3

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    1226

    Last Page

    1229

    WOS Identifier

    WOS:000316243800057

    ISSN

    1530-6984

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