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Directing Nanostructure Formation of Gold through the In Situ Underpotential Deposition of a Secondary Metal for the Detection of Nitrite Ions
Author(s) -
Lertanantawong Benchaporn,
Hoshyargar Faegheh,
O'Mullane Anthony P.
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700707
Subject(s) - underpotential deposition , cyclic voltammetry , nanostructure , nitrite , scanning electron microscope , electrochemistry , chemistry , aqueous solution , deposition (geology) , metal ions in aqueous solution , inorganic chemistry , chemical engineering , metal , materials science , nanotechnology , electrode , analytical chemistry (journal) , nitrate , organic chemistry , paleontology , composite material , engineering , sediment , biology
In this work, the underpotential deposition of metals such as copper and lead during the electrochemical deposition of gold is investigated to understand the influence that the incorporation of a second metal has on the morphology of gold nanostructures. The incorporation of Pb or Cu, even at concentrations as low as 0.2 %, significantly influences the morphology of the deposit, where the formation of elongated structures from a central gold structure is favored. These nanostructures are characterized by cyclic voltammetry, X‐ray diffraction, scanning electron microscopy, and energy‐dispersive X‐ray spectroscopy and are tested for their suitability as a sensing layer for the electrochemical detection of nitrite ions in aqueous solution. A limit of detection of 0.3 μM is achieved with a linear range up to 1 mM, which is adequate for the determination of nitrite contained within food products.