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Increased electrode activity during geosmin oxidation provided by Pt nanoparticle-embedded nanocarbon film

Abstract

Musty odor compound geosmin was electrochemically detected by using Pt nanoparticle (PtNP)-embedded nanocarbon (Pt-C) films formed with unbalanced magnetron (UBM) co-sputtering. The sputtered Pt components formed NPs (typically 1.53-4.75 nm in diameter) spontaneously in the carbon films, owing to the poor intermiscibility of Pt with carbon. The sur-face concentrations of PtNPs embedded in the nanocarbon film were widely controllable (Pt=4.8-35.9 at.%) by regulating the target powers of the Pt and carbon individually. The obtained film had a flat surface (Ra=0.17-0.18 nm) despite the fact the PtNPs were partially exposed at the surface. Compared with a Pt film electrode, some Pt-C films exhibited higher elec-trode activity against geosmin although the surface Pt concentrations of these Pt-C films were much lower than that of the Pt film electrode, thanks to the wider potential window and lower background current that resulted from the ultraflat and stable carbon-based film prepared by UBM co-sputtering. Computational experiments revealed that the theoretical oxida-tion potential (Eox) value for geosmin was relatively similar to that obtained in electrochemical experiments using our Pt-C film electrode. Moreover, we also theoretically estimated the possible oxidation site of geosmin molecules and the ad-vantage of the NP shape of the electroactive Pt parts as regards the electrochemical oxidation of geosmin. We successfully used the Pt-C film (10.6 at.%) electrode to detect geosmin in combination with HPLC at a low detection limit of 100 ng L-1.

  • This article is part of the themed collection: Nanocarbons
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Publication details

The article was received on 25 Jan 2019, accepted on 08 Apr 2019 and first published on 09 Apr 2019


Article type: Paper
DOI: 10.1039/C9NR00793H
Citation: Nanoscale, 2019, Accepted Manuscript

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    Increased electrode activity during geosmin oxidation provided by Pt nanoparticle-embedded nanocarbon film

    T. Kamata, M. Sumimoto, S. Shiba, R. Kurita, O. Niwa and D. Kato, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR00793H

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