Directly-thiolated graphene based electrochemical sensor for Hg(II) ion

Robert Ziółkowski , Adrianna Uścińska , Marta Mazurkiewicz-Pawlicka , Artur Małolepszy , Elżbieta Malinowska


In this study, an electrochemical sensor toward mercury ion was developed. As the sensing material directly-thiolated graphene (G-SH) was used. After the graphene synthesis and its characterization (elemental analysis, FT-IR and Raman spectroscopy, scanning electron microscopy), the best measurement conditions were chosen and working parameters of the sensor were evaluated. The G-SH thin film was formed on the glassy carbon electrode surface by drop-casting. Mercury ion concentration was determined with the use of voltammetric techniques by comparison of current change of redox indicator hexaammineruthenium(III) chloride. As was found, the sensor response is strictly dependent on the G-SH amount deposited at the electrode surface and the pH of the sample. The prepared sensor demonstrated linear response within the range of 5 × 10−9 to 5 × 10−7 mol L−1 and high selectivity towards Hg(II) ion over other examined cations (e.g. Sr2+, Fe3+, Co2+, Pb2+, Mg2+ and for Ca2+).
Author Robert Ziółkowski (FC / CMB)
Robert Ziółkowski,,
- Chair of Medical Biotechnology
, Adrianna Uścińska (FC / CMB)
Adrianna Uścińska,,
- Chair of Medical Biotechnology
, Marta Mazurkiewicz-Pawlicka (FCPE / DSP)
Marta Mazurkiewicz-Pawlicka,,
- Department of Separation Processes
, Artur Małolepszy (FCPE / DSP)
Artur Małolepszy,,
- Department of Separation Processes
Elżbieta Malinowska,,
- Chair of Medical Biotechnology
Journal seriesElectrochimica Acta, ISSN 0013-4686, (N/A 100 pkt)
Issue year2019
Publication size in sheets0.5
Keywords in Englishelectrochemistry, directly-thiolated graphene, mercury ion detection
ASJC Classification1603 Electrochemistry; 1500 General Chemical Engineering
Languageen angielski
Ziółkowski R. (i in.) - Directly-thiolated graphene...pdf 1.35 MB
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 20-12-2019, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.081; WoS Impact Factor: 2018 = 5.383 (2) - 2018=4.94 (5)
Citation count*
Additional fields
UwagiThis work was supported by grant from The National Center for Research and Development under the decision no. LIDER/35/0041/L-7/NCBR/2016 and by Warsaw University of Technology.
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