Amperometric ethanol biosensor based on carbon nanotubes dispersed in sol-gel-derived titania-Nafion composite film

Nim Choi Han, Young Ku Lyu, Hoon Han Jee, Won Yong Lee

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Composite solution of sol-gel-derived titania and perfluorosulfonated ionomer (Nafion) was used as a solubilizing agent for multiwalled carbon nanotubes (CNT) as well as an encapsulation matrix for alcohol dehydrogenase (ADH) for the fabrication of a highly sensitive and stable amperometric ethanol biosensor. ADH was immobilized within a thin film of CNT-titania-Nafion composite film coated on a glassy carbon electrode. Because of the mesoporous nature of the CNT-titania-Nafion composite film, the present biosensor exhibited remarkably fast response time within 2 s. The presence of CNT in the composite film increases not only the sensitivity of the ethanol biosensor but also the long-term stability of the biosensor. The present biosensor responds linearly to ethanol in the wide concentration ranges from 1.0 × 10-5 M to 3.0 × 10-3 M with the sensitivity of 51.6 mA M -1cm-2. The present biosensor showed good long-term stability with 75% of its activity retained after 4 weeks of storage in 50 mM phosphate buffer at pH 7.0.

Original languageEnglish
Pages (from-to)1524-1530
Number of pages7
JournalElectroanalysis
Volume19
Issue number14
DOIs
Publication statusPublished - 2007 Jul 1

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Carbon Nanotubes
Composite films
Biosensors
Sol-gels
Carbon nanotubes
Ethanol
Titanium
Alcohol Dehydrogenase
Alcohols
Ionomers
Multiwalled carbon nanotubes (MWCN)
Glassy carbon
Encapsulation
perfluorosulfonic acid
titanium dioxide
Buffers
Phosphates
Fabrication
Thin films
Electrodes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Electrochemistry

Cite this

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abstract = "Composite solution of sol-gel-derived titania and perfluorosulfonated ionomer (Nafion) was used as a solubilizing agent for multiwalled carbon nanotubes (CNT) as well as an encapsulation matrix for alcohol dehydrogenase (ADH) for the fabrication of a highly sensitive and stable amperometric ethanol biosensor. ADH was immobilized within a thin film of CNT-titania-Nafion composite film coated on a glassy carbon electrode. Because of the mesoporous nature of the CNT-titania-Nafion composite film, the present biosensor exhibited remarkably fast response time within 2 s. The presence of CNT in the composite film increases not only the sensitivity of the ethanol biosensor but also the long-term stability of the biosensor. The present biosensor responds linearly to ethanol in the wide concentration ranges from 1.0 × 10-5 M to 3.0 × 10-3 M with the sensitivity of 51.6 mA M -1cm-2. The present biosensor showed good long-term stability with 75{\%} of its activity retained after 4 weeks of storage in 50 mM phosphate buffer at pH 7.0.",
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Amperometric ethanol biosensor based on carbon nanotubes dispersed in sol-gel-derived titania-Nafion composite film. / Han, Nim Choi; Lyu, Young Ku; Jee, Hoon Han; Lee, Won Yong.

In: Electroanalysis, Vol. 19, No. 14, 01.07.2007, p. 1524-1530.

Research output: Contribution to journalArticle

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