Mass transport behavior of electrochemical species through plasma- polymerized thin film on platinum electrode

Atsunori Hiratsuka, Hitoshi Muguruma, Ryohei Nagata, Runa Nakamura, Kimiharu Sato, Shigeru Uchiyama, I. Karube

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We propose a novel method for generating thin film coating for use on a platinum (Pt) electrode. This is accomplished by a plasma-polymerized film (PPF), which is deposited directly onto the substrate under dry condition. The resulting films are extremely thin (< 100 nm), have good adherence to the substrate (electrode), and have a highly-cross-linked network structure. The PPF-deposited Pt electrode shows a high selectivity towards targeted species without decreasing the sensitivity (i.e. maintaining a high electrical signal). This property is partly attributed to size discrimination from a highly-cross-linked network structure in the film. Moreover, an acetonitrile PPF-deposited Pt electrode showed accumulation ability for hydrogen peroxide detection; the sensitivity of the PPF-deposited electrode (30-59 nm of film thickness) is one and half times larger than that of bare electrode. Chronocoulometric data support this effect. A hexadiene PPF-deposited Pt electrode also showed high selectivity between dopamine and ascorbic acid compared with a bare Pt electrode; the selectivity ratio for PPF-deposited electrode (37 nm of film thickness) is 12, whereas that of the bare electrode is 4.6. We demonstrate and discuss mass transport behavior of electrochemical species through plasma-polymerized thin film on platinum electrode. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)25-34
Number of pages10
JournalJournal of Membrane Science
Volume175
Issue number1
DOIs
Publication statusPublished - 2000 Aug 1

Keywords

  • Apparent diffusion coefficient
  • Chemically modified electrode
  • Electrochemical sensing
  • Plasma-polymerized film

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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