Effect of thickness and additional elements on the filtering properties of a thin Nafion layer

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorLeppänen, Elli
dc.contributor.authorPeltonen, Antti
dc.contributor.authorSeitsonen, Jani
dc.contributor.authorKoskinen, Jari
dc.contributor.authorLaurila, Tomi
dc.contributor.departmentDepartment of Electrical Engineering and Automation
dc.contributor.departmentAalto Nanofab
dc.contributor.departmentDepartment of Applied Physics
dc.contributor.departmentPhysical Characteristics of Surfaces and Interfaces
dc.contributor.departmentDepartment of Chemistry and Materials Scienceen
dc.date.accessioned2019-06-03T14:13:14Z
dc.date.available2019-06-03T14:13:14Z
dc.date.embargoinfo:eu-repo/date/embargoEnd/2021-05-08
dc.date.issued2019-06-15
dc.description.abstractNafion is widely used as a filtering membrane in electroanalytical applications to improve selectivity towards cations. However, the role of the thickness of Nafion on its electroanalytical performance is poorly understood. Furthermore, Nafion is often modified with additional elements without characterizing their influence on Nafion's filtering properties. To understand in-depth these uncharacterized effects on Nafion, we approach these issues systematically by studying first (i)the role of Nafion film thickness on top of a well characterized tetrahedral amorphous carbon electrode and second (ii)introducing nanodiamonds into the same Nafion films with different thicknesses. With careful electrochemical and structural analyses, we show that already ultrathin Nafion film significantly reduces limiting currents of anionic species IrCl 6 3−/4−and uric acid. With a thicker film (~3.6 μm)the selective nature of Nafion is demonstrated as anionic species are completely filtered and enrichment of cationic species Ru(NH 3 ) 6 2+/3+ is achieved. However, diffusion within the film controls the overall kinetics of the cation reactions and the electrochemical performance of Nafion is heavily dependent on the width of the potential window used. In addition, we show that modifying Nafion with nanodiamonds increases permeability of both cationic and anionic species. Hence, Nafion's ability for selective detection of cations is greatly reduced. Interestingly, chemical effects were also observed between nanodiamonds and an inner sphere redox probe uric acid. Thus, additional elements in Nafion do not only affect the physical structure of the film, but may produce chemical changes as well. Based on the results presented here, we emphasize the importance of an in-depth investigation to understand the case specific effects of modified Nafion films to guarantee the reliability of the sensor devices in the final application.en
dc.description.versionPeer revieweden
dc.format.extent10
dc.format.extent12-21
dc.format.mimetypeapplication/pdf
dc.identifier.citationLeppänen , E , Peltonen , A , Seitsonen , J , Koskinen , J & Laurila , T 2019 , ' Effect of thickness and additional elements on the filtering properties of a thin Nafion layer ' , Journal of Electroanalytical Chemistry , vol. 843 , pp. 12-21 . https://doi.org/10.1016/j.jelechem.2019.05.002en
dc.identifier.doi10.1016/j.jelechem.2019.05.002
dc.identifier.issn1572-6657
dc.identifier.issn1873-2569
dc.identifier.otherPURE UUID: 609ebd3e-631b-4d0f-b36b-1686dedcf418
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/609ebd3e-631b-4d0f-b36b-1686dedcf418
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85065161629&partnerID=8YFLogxK
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/33942830/ELEC_Leppanen_Effect_of_thickness.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/38271
dc.identifier.urnURN:NBN:fi:aalto-201906033356
dc.language.isoenen
dc.publisherElsevier Science
dc.relation.ispartofseriesJournal of Electroanalytical Chemistryen
dc.relation.ispartofseriesVolume 843en
dc.rightsopenAccessen
dc.subject.keywordNafion
dc.subject.keywordNanodiamonds
dc.subject.keywordRotating disk electrode
dc.subject.keywordSelectivity
dc.subject.keywordTetrahedral amorphous carbon
dc.titleEffect of thickness and additional elements on the filtering properties of a thin Nafion layeren
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
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[article-cris] Kemian tekniikan korkeakoulu / CHEM