Enzyme-free glucose sensors with channels composed of necked ZnO nanoparticles on plastic

Sukhyung Park, Kyoungah Cho, Sangsig Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this study, enzyme-free glucose sensors with channels composed of necked zinc oxide (ZnO) nanoparticles (NPs) are constructed on a plastic substrate, and their sensing characteristics are examined. When a phosphate buffer solution (PBS) of lower pH than the isoelectric point of ZnO is adsorbed on the necked ZnO NP channels, the current increases remarkably in magnitude at a bias voltage of 10 V compared with ZnO NP channels without the adsorption of PBS. The current decreases in magnitude with increasing number of moles of added glucose. When 2.5 × 10-12 moles of glucose are adsorbed on the PBS-adsorbed channels, the current in the channels at 10 V decreases in magnitude from 4.7 μA to 600 nA. The enzyme-free glucose sensors can detect 5 × 10-13 moles of glucose in air at room temperature.

Original languageEnglish
Pages (from-to)2611-2613
Number of pages3
JournalMicroelectronic Engineering
Volume88
Issue number8
DOIs
Publication statusPublished - 2011 Aug 1

Keywords

  • Biosensor
  • Enzyme-free
  • Glucose
  • Plastic sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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