pH-Sensitive solid-state electrode based on electrodeposited nanoporous platinum

Sejin Park, Hankil Boo, Yunmee Kim, Ji Hyung Han, Hee Chan Kim, Taek Dong Chung

Research output: Contribution to journalArticleResearchpeer-review

49 Citations (Scopus)

Abstract

The nanoporous platinum oxide (H1-ePtO) as a hydrogen ion-selective sensing material is reported. Bare nanoporous platinum oxides exhibit near-Nernstian behavior (e.g., -55 mV/pH in PBS), ignorable hysteresis, a short response time, and high precision, which are remarkably better than those of flat platinum oxides. The electrode potential of a nanoporous platinum oxide responds exclusively to hydrogen ion, which implies its usefulness as a solid-state pH sensor. In the present study, the performance of nanoporous platinum oxide was investigated and compared with that of IrOx in terms of selectivity and the influences of ionic strength, temperature, complexing ligands, and surfactants. H1-ePtO functions well as a pH-sensing solid-state material, and it is viewed as a promising alternative to IrOx. Interference by redox couples was successfully suppressed by covering the H1-ePtO surface with a protective layer, e.g., an electropolymerized polyphenol thin film. Since the nanoporous platinum oxide with such a protective layer is particularly suitable for miniaturization and micropatterning, our findings suggest its usefulness in applications such as solid-state pH sensors embedded in chip-based microanalysis systems.

Original languageEnglish
Pages (from-to)7695-7701
Number of pages7
JournalAnalytical Chemistry
Volume77
Issue number23
DOIs
StatePublished - 1 Dec 2005

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Platinum
Electrodes
Solid-state sensors
pH sensors
Protons
Microanalysis
Polyphenols
Ionic strength
Surface-Active Agents
Hysteresis
platinum oxide
Ligands
Thin films
Temperature

Cite this

Park, Sejin ; Boo, Hankil ; Kim, Yunmee ; Han, Ji Hyung ; Kim, Hee Chan ; Chung, Taek Dong. / pH-Sensitive solid-state electrode based on electrodeposited nanoporous platinum. In: Analytical Chemistry. 2005 ; Vol. 77, No. 23. pp. 7695-7701.
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title = "pH-Sensitive solid-state electrode based on electrodeposited nanoporous platinum",
abstract = "The nanoporous platinum oxide (H1-ePtO) as a hydrogen ion-selective sensing material is reported. Bare nanoporous platinum oxides exhibit near-Nernstian behavior (e.g., -55 mV/pH in PBS), ignorable hysteresis, a short response time, and high precision, which are remarkably better than those of flat platinum oxides. The electrode potential of a nanoporous platinum oxide responds exclusively to hydrogen ion, which implies its usefulness as a solid-state pH sensor. In the present study, the performance of nanoporous platinum oxide was investigated and compared with that of IrOx in terms of selectivity and the influences of ionic strength, temperature, complexing ligands, and surfactants. H1-ePtO functions well as a pH-sensing solid-state material, and it is viewed as a promising alternative to IrOx. Interference by redox couples was successfully suppressed by covering the H1-ePtO surface with a protective layer, e.g., an electropolymerized polyphenol thin film. Since the nanoporous platinum oxide with such a protective layer is particularly suitable for miniaturization and micropatterning, our findings suggest its usefulness in applications such as solid-state pH sensors embedded in chip-based microanalysis systems.",
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pH-Sensitive solid-state electrode based on electrodeposited nanoporous platinum. / Park, Sejin; Boo, Hankil; Kim, Yunmee; Han, Ji Hyung; Kim, Hee Chan; Chung, Taek Dong.

In: Analytical Chemistry, Vol. 77, No. 23, 01.12.2005, p. 7695-7701.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Boo, Hankil

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AU - Han, Ji Hyung

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AU - Chung, Taek Dong

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