Journal
MICROCHIMICA ACTA
Volume 186, Issue 4, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3328-6
Keywords
Electrochemical analysis; Arsenic; Ultratrace detection; Synergistic effect; Plasmonic Ag; Au hollow nanoshells
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Funding
- National Natural Science Foundation [21605057, 21705056]
- Natural Science Foundation of Shandong Province [ZR2016BQ07]
- Foundation of State Key Laboratory of Electroanaytical Chemistry [SKLEAC201907]
- Study Abroad Fund
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The authors have fabricated reduced graphene oxide nanosheets (rGO) supported with Fe3O4 nanoparticles and Ag/Au hollow nanoshells. The material was placed on a glassy carbon electrode which is shown to enable highly sensitive determination of As(III) which is first preconcentrated from solution at a potential of -0.35V (versus Ag/AgCl) for 100s. The electrode, typically operated at a working potential as low as 0.06V, has a linear response in the 0.1 to 20ppb As(III) concentration range and a 0.01ppb detection limit. The electrochemical sensitivity is 52Appb(-1). The high sensitivity is assumed to be the result of various synergistic effects. The method was applied to ultratrace (0.1ppt) determination of As(III) in real water samples.
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