Diffusion-controlled size-selective chloride ion sensing in the presence of bromide ion using a thin, nanoporous, plasma-polymerized coating on an Ag/AgCl electrode

Hitoshi Muguruma, Tomoya Sekikawa, Shun ichiro Ueno, Nobuhiko Kubota

Research output: Contribution to journalArticle

2 Citations (Scopus)


We have developed a diffusion-controlled size-selective method for sensing chloride ion in the presence of bromide ion, based on a thin, nanoporous, plasma-polymerized coating of hexamethyldisiloxane on an Ag/AgCl electrode. Sub-nanometer-sized pores responsible for a highly cross-linked polymer network in the plasma-polymerized coating allowed diffusion-controlled permeation of chloride ion while blocking the larger bromide ion. An electrode coating of thickness greater than 70 nm enabled chloride detection in the concentration range 1-10 mM in the presence of 0.63 mM bromide ion. Advantages of this approach are: (1) simple design compared with ionophore-based strategies and (2) compatibility with microfabrication and mass production processes.

Original languageEnglish
Pages (from-to)6978-6980
Number of pages3
JournalThin Solid Films
Issue number17
Publication statusPublished - 2007 Jun 1



  • Ag/AgCl electrode
  • Bromide ion
  • Chloride ion sensor
  • Plasma polymerization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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