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  • Gold-enhanced Raman observation of chalcopyrite leaching

    Author(s)
    Parker, Gretel K
    Hope, Gregory A
    Woods, Ronald
    Griffith University Author(s)
    Hope, Gregory A.
    Woods, Ronald
    Heber, Gretel
    Year published
    2008
    Metadata
    Show full item record
    Abstract
    Gold decoration of chalcopyrite surfaces has been shown to stimulate surface enhancement of Raman scattering and this enables oxidation products, undetectable using normal Raman spectroscopy, to be investigated. Electroless deposition, sputtering and evaporative deposition facilitated SERS. In situ potentiodynamic investigations demonstrated similar oxidative product/s on the chalcopyrite surface in sulfate or chloride aqueous acid solutions. The product/s appeared to be amorphous and commenced S S bonding in the transpassive potential region. The SS bands from the oxidized surface were broad and at a lower Raman shift ...
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    Gold decoration of chalcopyrite surfaces has been shown to stimulate surface enhancement of Raman scattering and this enables oxidation products, undetectable using normal Raman spectroscopy, to be investigated. Electroless deposition, sputtering and evaporative deposition facilitated SERS. In situ potentiodynamic investigations demonstrated similar oxidative product/s on the chalcopyrite surface in sulfate or chloride aqueous acid solutions. The product/s appeared to be amorphous and commenced S S bonding in the transpassive potential region. The SS bands from the oxidized surface were broad and at a lower Raman shift than elemental sulfur, indicative of an aging metal-deficient remnant sulfide lattice. The oxidation product/s was not consistent with the formation of polysulfides or polythionates. Ex situ investigations of oxidised chalcopyrite surfaces and model systems corroborated in situ data, in that the species detected were oxidation products of the chalcopyrite, rather than artifacts of sample preparation.
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    Journal Title
    Colloids and Surfaces A: Physicochemical and Engineering Aspects
    Volume
    325
    Issue
    1-3
    Publisher URI
    http://www.elsevier.com/wps/find/homepage.cws_home
    DOI
    https://doi.org/10.1016/j.colsurfa.2008.04.054
    Subject
    Physical Sciences
    Chemical Sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/26190
    Collection
    • Journal articles

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