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Electrochemically reduced graphene oxide on gold nanoparticles modified with a polyoxomolybdate film. Highly sensitive non-enzymatic electrochemical detection of H2O2.

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dc.abstract.enGold nanoparticles (AuNPs) were prepared via the chloroauric acid reduction using Keggin-type anions (PMo12O403−). The layer of AuNPs was deposited on the glassy carbon electrode (GC) and conditioned using repetitive potential cycling between 0.3 and −0.4 V vs. SCE in the buffer solution at pH = 6. The changes in the polyoxometalate structure upon cycling are studied using Raman spectra. Graphene oxide(GO) was drop-cast on a thin layer of AuNPs on a GC electrode. Then, GO was reduced by scanning the electrode potential between −0.4 and −1.2 V vs. Ag/AgCl. The resulting layer of the electrochemically reduced graphene oxide (ERGO) on AuNPs shows non-enzymatic sensitivity to hydrogen peroxide. The sensitivity of the ERGO/AuNPs/GC/electrode to H2O2 equals 741 mA mM−1 cm−2 (limit of detection is equal to 56 nM) for the H2O2 concentration lower than 0.1 mM, and 381.5 mikroA mikroM−1 cm−2 at the higher concentration of H2O2. The electrocatalytic activity of the bare AuNPs layer and the activity of ERGO deposited directly on the GC electrode are significantly lower, which pointing to a synergistic effect between ERGO and AuNPs. The electrodes are characterized using Raman spectra. The mechanism of the ERGO-AuNPs synergistic electrocatalysis is proposed.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorJabłońska, Anna
dc.contributor.authorBerbeć, Sylwia
dc.contributor.authorŻołądek, Sylwia
dc.contributor.authorPałys, Barbara
dc.date.accessioned2024-01-24T22:33:05Z
dc.date.available2024-01-24T22:33:05Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.volume258
dc.identifier.doi10.1016/J.SNB.2017.11.163
dc.identifier.issn0925-4005
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/105968
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofSensors and Actuators, B: Chemical
dc.relation.pages745-756
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enH2O2reduction
dc.subject.enElectrocatalysis
dc.subject.enGraphene
dc.subject.enNon-enzymatic
dc.subject.enOxygen reduction
dc.titleElectrochemically reduced graphene oxide on gold nanoparticles modified with a polyoxomolybdate film. Highly sensitive non-enzymatic electrochemical detection of H2O2.
dc.typeJournalArticle
dspace.entity.typePublication