Direct observation of mercury amalgamation on individual gold nanorods using spectroelectrochemistry

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dc.contributor.authorSchopf, Carola
dc.contributor.authorWahl, Amélie
dc.contributor.authorMartín, Alfonso
dc.contributor.authorO'Riordan, Alan
dc.contributor.authorIacopino, Daniela
dc.contributor.funderSeventh Framework Programmeen
dc.date.accessioned2019-07-10T15:34:59Z
dc.date.available2019-07-10T15:34:59Z
dc.date.issued2016-06-28
dc.description.abstractWe report on the use of a spectroelectrochemical method for the investigation of mercury amalgamation on gold nanorods. Hg2+ was electrochemically reduced at gold nanorod electrodes, and the consequent optical changes resulting from deposition of mercury were monitored by dark-field microscopy. Nanorods displayed marked scattering color transitions from red to green and longitudinal surface plasmon resonance (LSPR) blue-shifts up to 197 nm. Corresponding cathodic voltammograms showed strong reduction peaks at potentials which were attributed to Hg2+ reduction. The highest optical blue-shifts were observed for working electrodes constituted by well-separated gold nanorods deposited on ITO substrates, which also showed transition from diffusion-limited to steady-state electrochemical behavior. Theoretical simulations were carried out to support experimental results and to obtain further insight into the diffusional behavior of mercury reduction at nanorod electrodes. Real time observation of the amalgamation process was performed by monitoring the evolution of spectral response from single nanorods in the presence of Hg2+ and subjected to either linear sweep voltammetry or chronoamperometry. The analysis confirmed a direct correlation between the occurrence of spectral changes and the formation of an amalgam resulting from deposition and subsequent diffusion of reduced mercury into the nanorods. This work shows the potential of this method for elucidation of reaction mechanisms occurring at nanoscale electrodes and for sensitive detection of mercury for environmental applications.en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSchopf, C., Wahl, A., Martín, A., O’Riordan, A. and Iacopino, D. (2016) 'Direct Observation of Mercury Amalgamation on Individual Gold Nanorods Using Spectroelectrochemistry', The Journal of Physical Chemistry C, 120(34), pp. 19295-19301. doi: 10.1021/acs.jpcc.6b04668en
dc.identifier.doi10.1021/acs.jpcc.6b04668en
dc.identifier.endpage19301en
dc.identifier.issn1932-7447
dc.identifier.issued34en
dc.identifier.journaltitleJournal of Physical Chemistry Cen
dc.identifier.startpage19295en
dc.identifier.urihttps://hdl.handle.net/10468/8137
dc.identifier.volume120en
dc.language.isoenen
dc.publisherAmerican Chemical Society, ACSen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::NMP/263091/EU/Hybrid Molecule-Nanocrystal Assemblies for Photonic and Electronic Sensing Applications/HYSENSen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::SEC/312829/EU/Rapid On-site Forensic Analysis of Explosives and Narcotics/ROSFENen
dc.relation.urihttps://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b04668
dc.rights© 2016 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b04668en
dc.subjectElectrochemical electrodesen
dc.subjectChronoamperometryen
dc.subjectDepositionen
dc.subjectElectrodesen
dc.subjectGolden
dc.subjectGold depositsen
dc.subjectMercury (metal)en
dc.subjectMetalsen
dc.subjectNanorodsen
dc.subjectPlasmonsen
dc.subjectReductionen
dc.subjectSpectroelectrochemistryen
dc.subjectSurface plasmon resonanceen
dc.titleDirect observation of mercury amalgamation on individual gold nanorods using spectroelectrochemistryen
dc.typeArticle (peer-reviewed)en
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