Direct observation of mercury amalgamation on individual gold nanorods using spectroelectrochemistry

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dc.contributor.author Schopf, Carola
dc.contributor.author Wahl, Amélie
dc.contributor.author Martín, Alfonso
dc.contributor.author O'Riordan, Alan
dc.contributor.author Iacopino, Daniela
dc.date.accessioned 2019-07-10T15:34:59Z
dc.date.available 2019-07-10T15:34:59Z
dc.date.issued 2016-06-28
dc.identifier.citation Schopf, 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.6b04668 en
dc.identifier.volume 120 en
dc.identifier.issued 34 en
dc.identifier.startpage 19295 en
dc.identifier.endpage 19301 en
dc.identifier.issn 1932-7447
dc.identifier.uri http://hdl.handle.net/10468/8137
dc.identifier.doi 10.1021/acs.jpcc.6b04668 en
dc.description.abstract We 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.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Chemical Society, ACS en
dc.relation.uri https://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.6b04668 en
dc.subject Electrochemical electrodes en
dc.subject Chronoamperometry en
dc.subject Deposition en
dc.subject Electrodes en
dc.subject Gold en
dc.subject Gold deposits en
dc.subject Mercury (metal) en
dc.subject Metals en
dc.subject Nanorods en
dc.subject Plasmons en
dc.subject Reduction en
dc.subject Spectroelectrochemistry en
dc.subject Surface plasmon resonance en
dc.title Direct observation of mercury amalgamation on individual gold nanorods using spectroelectrochemistry en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Daniela Iacopino, Tyndall Micronano Electronics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: daniela.iacopino@tyndall.ie en
dc.internal.availability Full text available en
dc.description.version Accepted Version en
dc.contributor.funder Seventh Framework Programme en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Journal of Physical Chemistry C en
dc.internal.IRISemailaddress daniela.iacopino@tyndall.ie en
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP1::NMP/263091/EU/Hybrid Molecule-Nanocrystal Assemblies for Photonic and Electronic Sensing Applications/HYSENS en
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP1::SEC/312829/EU/Rapid On-site Forensic Analysis of Explosives and Narcotics/ROSFEN en


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