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Work function modifications of graphite surface via oxygen plasma treatment
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-7790-8987
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2017 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 419, 439-446 p.Article in journal (Refereed) Published
Abstract [en]

The surface modification of graphite by oxygen plasma was investigated experimentally (X-ray diffraction, nanoparticle tracking analysis, laser desorption ionization mass spectrometry, thermogravimetry, water contact angle) and by molecular modelling (Density Functional Theory). Generation of surface functional groups (mainly –OHsurf) leads to substantial changes in electrodonor properties and wettability gauged by work function and water contact angle, respectively. The invoked modifications were analyzed in terms of Helmholtz model taking into account the theoretically determined surface dipole moment of graphite—OHsurf system (μ = 2.71 D) and experimentally measured work function increase (from 0.75 to 1.02 eV) to determine the –OH surface coverage (from 0.70 to 1.03 × 1014 groups cm−2). Since the plasma treatment was confined to the surface, the high thermal stability of the graphite material was preserved as revealed by the thermogravimetric analysis. The obtained results provide a suitable quantitative background for tuning the key operating parameters of carbon electrodes: electronic properties, interaction with water and thermal stability.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 419, 439-446 p.
Keyword [en]
Basal plane, Carbon materials, Oxygen functional groups, Surface dipole, Wettability, Work function
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Other Chemistry Topics
Identifiers
URN: urn:nbn:se:kth:diva-209493DOI: 10.1016/j.apsusc.2017.05.007Scopus ID: 2-s2.0-85019219886OAI: oai:DiVA.org:kth-209493DiVA: diva2:1113011
Note

QC 20170621

Available from: 2017-06-21 Created: 2017-06-21 Last updated: 2017-06-21Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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