Investigation of a photoelectrochemical passivated ZnO-based glucose biosensor

Ching Ting Lee, Ying Shuo Chiu, Shu Ching Ho, Yao Jung Lee

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

A vapor cooling condensation system was used to deposit high quality intrinsic ZnO thin films and intrinsic ZnO nanorods as the sensing membrane of extended-gate field-effect-transistor (EGFET) glucose biosensors. The sensing sensitivity of the resulting glucose biosensors operated in the linear range was 13.4 μA mM-1 cm-2. To improve the sensing sensitivity of the ZnO-based glucose biosensors, the photoelectrochemical method was utilized to passivate the sidewall surfaces of the ZnO nanorods. The sensing sensitivity of the ZnO-based glucose biosensors with passivated ZnO nanorods was significantly improved to 20.33 μA mM-1 cm-2 under the same measurement conditions. The experimental results verified that the sensing sensitivity improvement was the result of the mitigation of the Fermi level pinning effect caused by the dangling bonds and the surface states induced on the sidewall surface of the ZnO nanorods.

Original languageEnglish
Pages (from-to)4648-4655
Number of pages8
JournalSensors
Volume11
Issue number5
DOIs
Publication statusPublished - 2011 May

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering

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