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Chemical Optimization for Simultaneous Voltammetric Detection of Molybdenum and Silver Nanoparticles in Aqueous Buffer Solutions
Author(s) -
Goda Tatsuro,
Oohashi Mikiya,
Matsumoto Akira,
Hoshi Toru,
Sawaguchi Takashi,
Pumera Martin,
Miyahara Yuji
Publication year - 2014
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402269
Subject(s) - redox , molybdenum , differential pulse voltammetry , electrochemistry , nanoparticle , chemistry , aqueous solution , silver nanoparticle , electrolyte , supporting electrolyte , glassy carbon , buffer solution , voltammetry , metal , cyclic voltammetry , electrode , analytical chemistry (journal) , inorganic chemistry , materials science , chromatography , nanotechnology , organic chemistry
Simultaneous acquisition of redox signals from different types of metal nanoparticles (NPs) in a multiplexing system requires a good separation in redox potential from each component for successful identification. The appearance of a single distinct peak for each NP type is also preferred. Here, we report variations in the electrochemical nature of molybdenum (Mo) and silver (Ag) NPs cast on a glassy carbon electrode that are sensitive to various conditions of the measurement solution, such as buffering capacity and electrolyte concentration. A series of experiments allowed us to find optimal conditions, where Mo NPs showed a single oxidation peak with good separation of the redox potential from that of Ag NPs (Δ E ≈0.25 V), by using differential‐pulse voltammetry (DPV). In the simultaneous monitoring of Mo and Ag NPs under the optimal conditions, the peak currents in DPV were quantitative for the amount of Mo/Ag NPs ranging from 7.8/20 to 500/20 ng ng −1 and from 500/20 to 500/0.31 ng ng −1 .