Bioelectrocatalytic application of titania nanotube array for molecule detection

Yibing Xie, Li Min Zhou, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

78 Citations (Scopus)

Abstract

A bioelectrocatalysis system based on titania nanotube electrode has been developed for the quantitative detection application. Highly ordered titania nanotube array with inner diameter of 60 nm and total length of 540 nm was formed by anodizing titanium foils. The functionalization modification was achieved by embedding glucose oxidases inside tubule channels and electropolymerizing pyrrole for interfacial immobilization. Morphology and microstructure characterization, electrochemical properties and bioelectrocatalytic reactivities of this composite were fully investigated. The direct detection of hydrogen peroxide by electrocatalytic reduction reaction was fulfilled on pure titania nanotube array with a detection limit up to 2.0 × 10-4mM. A biosensor based on the glucose oxidase-titania/titanium electrode was constructed for amperometric detection and quantitative determination of glucose in a phosphate buffer solution (pH 6.8) under a potentiostatic condition (-0.4 V versus SCE). The resulting glucose biosensor showed an excellent performance with a response time below 5.6 s and a detection limit of 2.0 × 10-3mM. The corresponding detection sensitivity was 45.5 μA mM-1cm-2. A good operational reliability was also achieved with relative standard deviations below 3.0%. This novel biosensor exhibited quite high response sensitivity and low detection limit for potential applications.
Original languageEnglish
Pages (from-to)2812-2818
Number of pages7
JournalBiosensors and Bioelectronics
Volume22
Issue number12
DOIs
Publication statusPublished - 15 Jun 2007

Keywords

  • Amperometric detection
  • Bioelectrocatalysis
  • Biosensor
  • Titania nanotube array

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Electrochemistry

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