Effects of the type of polycation in the coating films prepared by a layer-by-layer deposition technique on the properties of amperometric choline sensors

Haibin Shi, Zhao Song, Jiadong Huang, Yu Yang, Zixia Zhao, Jun Ichi Anzai, Tetsuo Osa, Qiang Chen

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

A layer-by-layer deposition technique was employed for fabricating choline sensors with different polycations. We used two kinds of choline oxidase (ChOx)/polycation thin films to modify platinum (Pt) electrodes, each having the same enzyme (ChOx) but with different polycations, poly(ethyleneimine) (PEI) and poly(diallyldimethylammonium chloride) (PDDA). The Pt electrodes coated with a ChOx/PEI or ChOx/PDDA thin film were used successfully as choline sensors. The ChOx/PEI film-modified sensor showed a higher response, wider dynamic range and shorter response time than those of the ChOx/PDDA film-based sensor. The results were rationalized based on the different permeability of the thin films due to the different structure of the polycationic materials. The assembly processes of the thin films were monitored by quartz crystal microbalance (QCM) measurements.

Original languageEnglish
Pages (from-to)341-347
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume109
Issue number2
DOIs
Publication statusPublished - 2005 Sep 14

Keywords

  • Choline oxidase
  • Choline sensor
  • Layer-by-layer deposition
  • Poly(diallyldimethylammonium chloride)
  • Poly(ethyleneimine)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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