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 |
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Authors: | Hitoshi Muguruma Tomoya Sekikawa Nobuhiko Kubota |
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Affiliation: | a Department of Electronic Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan b Ishikawajima-Harima Heavy Industries Co., Ltd. 3-1-1 Toyosu, Koto-ku, Tokyo 135-8710, Japan |
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Abstract: | 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. |
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Keywords: | Chloride ion sensor Bromide ion Ag/AgCl electrode Plasma polymerization |
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